Patreon for Assisi embroidery creators: voided cross-stitch background fill, double running stitch Holbein outline two-pass method, chart inversion workflow, 28-count evenweave vs 18-count Aida fabric choice, traditional heraldic motif design, and Apple Tax impact on iOS creator revenue

2026-07-23 · ~4,600 words · KeepTier

Assisi embroidery inverts the fundamental assumption of cross-stitch: instead of stitching the motif and leaving the background empty, you stitch the background and leave the motif as a structured void. The result is a luminous figure reading against a richly textured ground — a reversal of figure and field that gives the technique its distinctively architectural quality. Assisi work originated in the church linen workshops of Assisi, Umbria, where embroiderers producing reversible altar cloths and vestments developed a technique that looked identical from both sides. The double running stitch (Holbein stitch) forming the outlines achieves this two-sided property; the solid cross-stitch background, while only worked from the front, creates depth against the untouched linen ground.

For Patreon creators, Assisi embroidery occupies a productive niche. It photographs well against neutral backgrounds, the geometric precision of the heraldic motifs reads clearly at Instagram thumbnail scale, and the technique has a traceable historical lineage that supports educational content. Pattern design — creating new heraldic animals, adapting medieval manuscript marginalia, converting coat-of-arms imagery into counted charts — generates ongoing subscription value. But the Apple in-app purchase fee arriving November 1, 2026 threatens a significant portion of that revenue for creators whose patrons subscribe via iPhone. This guide covers both the technical depth that justifies subscription tiers and the financial arithmetic of iOS exposure.

The voided technique: theory and visual logic

Understanding why Assisi work looks the way it does requires grasping the figure-void relationship. In standard cross-stitch, stitches define the motif directly — each X marks a point of color belonging to the subject. In Assisi, stitches define the surrounding field, and the motif is the shaped absence within that field. This is not a minor convention; it changes how the eye reads the composition and how the embroiderer must think while working.

The motif in Assisi work is bounded by a Holbein stitch outline and defined by contrast with the filled background. Because the background is always a single solid color (in traditional work), the motif reads as a silhouette. The outline stitch, in a darker value, separates motif from ground and gives the edge precision. A well-executed Assisi bird or griffin is immediately legible at three feet because the outline crisp and the background uniform — no shading, no gradient, no tonal modeling within the motif void.

This simplicity in the final reading masks complexity in the execution. The embroiderer must maintain perfect stitch count discipline across the entire background, work Holbein outline stitches that are geometrically exact, and resist the intuitive pull to stitch "into" the motif. Beginners frequently place a stitch or two inside the motif boundary on reflex; catching this requires constant chart reference and an active inversion of normal cross-stitch habits.

Traditional Assisi compositions organize the picture plane into three zones: a central panel containing the primary motif (typically a single heraldic animal or a symmetrical pair), a surrounding background fill of uniform cross-stitch, and one or more geometric borders in Holbein stitch framing the whole piece. Border patterns include interlocking key or meander designs, chevron chains, and foliated scrollwork — all compatible with the two-pass running stitch method. Contemporary makers add a fourth zone: a secondary fill in a complementary color within the borders, creating a layered panel effect.

Double running stitch (Holbein stitch): mechanics of the two-pass method

The double running stitch, standardly called Holbein stitch in embroidery literature after Hans Holbein the Younger who depicted it in his Tudor court portraits, is the structural backbone of Assisi work. Its defining property is reversibility: the stitch produces a solid unbroken line identical on front and back. This was not decorative — it was functionally required for church linens used on both sides of altars.

First pass: starting from the right end of a line (or left for left-handers), bring the needle up at the first hole and work running stitches along the design path. Each stitch covers two fabric threads (on 28-count evenweave) or one grid square (on 18-count Aida), leaving a gap of equal size between stitches. Travel the entire length of the design line, ending with a gap at the far end. You have laid the odd-numbered stitches (1, 3, 5...).

Second pass: reverse direction and return along the same path, placing stitches that fill the gaps (2, 4, 6...). The needle enters and exits the same holes used by the first pass, so no new holes are pierced — the thread simply fills the empty intervals between first-pass stitches. When complete, both faces of the fabric show an unbroken solid line.

Thread tension on the second pass is the critical variable. The second-pass thread must lie flat alongside the first-pass stitches without compressing them; this requires slightly relaxed tension on the return. If the second pass is pulled tight, it will gather the first-pass stitches into a slight ridge; if it is too loose, the gaps between passes will be visible as a faint stripe. Practice on a 4-inch sampler before working a finished piece.

Corners: on the first pass, work to the stitch immediately before the corner. On the return pass, your needle will enter the corner hole and exit along the new direction — the corner hole becomes the shared terminal point of both the horizontal and vertical stitch sequences. Because the corner hole is entered twice (once per direction), the thread builds up there; use a thinner strand count or a slightly smaller needle to avoid distorting the fabric. On 28-count evenweave, two strands in the Holbein line vs. three strands in the background fill gives the outline its visual crispness without corner puckering.

Curves: Holbein stitch on a grid approximates curves with very short straight segments. On 28-count over 2 threads, the minimum straight segment is two threads; by angling these segments at 45°, 0°, and 90°, curves of any radius can be approximated. The minimum curve radius without visual coarseness is approximately 8 threads (4 two-thread segments) on 28-count. Tighter curves appear faceted; in traditional Assisi designs this is acceptable because the motifs are geometric or heraldic rather than naturalistic, and faceting reads as intentional stylization.

Starting the thread: traditional Assisi embroiderers use a waste knot placed on the front of the fabric, four to six stitches ahead of the start point, so the working thread anchors under the approaching stitches and the knot is cut away. A loop start (fold a single strand double, thread both cut ends through the needle, bring the loop end through fabric first and anchor the loop under the first stitch) works equally well and leaves no trimming. Avoid back-knotted starts: the knot creates a ridge visible through fine linen.

Background fill execution: cross-stitch density and working sequence

The background cross-stitch in Assisi work must be worked with complete stitch-direction uniformity — the top stitch of every X must angle in the same direction (conventionally /) across the entire field. Inconsistent top-stitch direction creates a reflective mottling visible in raking light: some areas will catch light at a different angle than adjacent areas, producing a patchwork effect. On commercial linen under show-lighting, this defect is immediately apparent.

Working sequence: most embroiderers work background fill in diagonal rows running from upper left to lower right, placing half-stitches on the forward pass and completing the X on the return. Diagonal rows have two advantages over horizontal rows: they follow the thread grain more naturally (reducing fabric distortion from uneven tension pull) and they make the boundary between the fill and the motif void easier to manage because you approach the motif edge at an angle rather than abruptly stopping a horizontal row.

Where background fill meets the Holbein outline: the cross-stitch background stitches share the same holes as the Holbein outline stitches at the boundary. On 28-count evenweave, the cross-stitch adjacent to the outline enters the same holes as the Holbein thread; both threads share the hole, and the needle must be inserted carefully to avoid splitting the Holbein thread. Use a blunt tapestry needle for the cross-stitch fill to help guide the needle between existing threads rather than through them.

Thread selection for background fill: DMC stranded cotton in 2 strands on 28-count over 2 threads produces good coverage with a slight sheen. Anchor stranded cotton in equivalent weights is interchangeable. For historical accuracy, Filoselle or Soie d'Alger silk in comparable weights gives the dense reflective quality of Renaissance ecclesiastical work. Avoid variegated threads for Assisi backgrounds — the color variation interrupts the visual unity of the ground and reduces the contrast with the motif void. Single-dye-lot solid colors with a slight twist are ideal.

Coverage test: before working the full piece, stitch a 1-inch test square on the project fabric. Correct coverage means no linen threads visible between cross-stitches when viewed straight on; slight angle-of-incidence changes may reveal the fabric weave under the stitches, which is acceptable. If coverage is thin, add a third strand; if coverage is too heavy (compressing the grid squares visibly), reduce to 1.5 strands by splitting a 6-strand skein into a 3-strand length and then separating one strand from a second 3-strand length and combining.

Chart design and the inversion workflow

Chart inversion is the conceptual shift that separates Assisi design from conventional cross-stitch design. In a standard cross-stitch chart, a designer colors the squares representing the motif and leaves the background blank. In an Assisi chart, the designer draws the motif as a contour-line image (to be translated into Holbein stitch) and then fills the background squares with the fill symbol, leaving the motif squares blank. The chart visually shows mostly fill symbol with a shaped white void — which is the motif.

Working from existing cross-stitch charts: any cross-stitch chart with a clear silhouette motif can be converted to Assisi format. (1) Identify the outer boundary of the motif — this becomes the Holbein stitch path. (2) Fill all background squares with the background cross-stitch symbol. (3) Clear the interior of the motif. The Holbein path can be traced directly onto graph paper using the pixel boundaries of the original cross-stitch motif as the outline. Complex internal details in the original (feather shading, interior color variations) are eliminated — Assisi work shows only the silhouette, not interior detail.

Designing original motifs: heraldic references are the primary source. Key references: Stephen Friar's A Dictionary of Heraldry for lion passant, griffin, and eagle poses; the Ashmolean Museum's online digitized collection of medieval manuscripts for marginalia creature forms; and the public-domain Heidelberg University library collections for 15th-century German heraldry plates. Convert a heraldic line drawing to a counted chart by overlaying graph paper (scaled to your thread count) and tracing the silhouette to the nearest grid intersection.

Stitch count planning: on 28-count evenweave over 2 threads (= 14 stitches/inch), a 3×4 inch motif area is 42×56 stitches. On 18-count Aida (18 stitches/inch), the same physical size is 54×72 stitches. A bookmark format (2×7 inches) on 28-count is 28×98 stitches — a standard introductory size for Assisi pattern packs. A 5×7 inch framed piece on 28-count is 70×98 stitches and requires approximately 8–10 hours for a practiced embroiderer.

Border design: traditional Assisi borders are 8–20 stitches wide and use geometric interlocking forms. A key-pattern (Greek key/meander) border on 28-count typically repeats every 12 stitches in the horizontal direction and is 12 stitches tall. The border is worked entirely in Holbein stitch, not cross-stitch, so it is reversible and uses a thinner thread than the background fill. A vine-scroll border adds 4–8 stitches of cross-stitch ground on either side, producing a wider framing element.

Fabric preparation and mounting

Assisi embroidery on linen requires pre-washing to remove sizing and allow for the dimensional shrinkage that occurs during embroidery (stitches pull the fabric slightly). Pre-wash unbleached linen in cool water, roll in a towel to remove excess moisture, and press while slightly damp with a warm iron on the straight grain. Pressing on the bias will distort the weave and create stitching difficulties. Allow to cool completely before marking.

Fabric grain alignment: the most common error in counted thread work is starting on a slight bias, which accumulates across a large piece into a visible slant. On 28-count evenweave, thread a needle with a single strand of contrast thread and weave it along one fabric thread for 6 inches to verify you are following a true warp thread. Use this thread as a reference line for chart center.

Mounting for stitching: a scroll frame (slate frame) or stretcher bars maintain even fabric tension better than a round hoop for large Assisi pieces. Hoop use for more than a few minutes creates hoop marks in linen that require steaming to remove; if using a hoop, wrap the inner ring with white cotton twill tape to grip the fabric without compressing it. For pieces over 12 inches, a slate frame laced at all four sides is the traditional choice — it maintains even warp and weft tension and prevents the elongation-from-hooping that distorts stitch geometry.

Marking the chart center: fold the fabric in quarters and mark the center with a water-soluble marking pen (test first on a scrap — some Zweigart sizing reacts with markers). Work outward from center. On a symmetrical heraldic motif, the center of the void should align with fabric center; the background fill extends to all four edges.

Traditional color systems and contemporary palettes

Historical Assisi embroidery used a constrained three-color vocabulary: (1) a warm natural linen ground (the fabric itself — no stitching), (2) a mid-value background fill (traditionally warm rust red, cobalt blue, or forest green), and (3) a dark Holbein outline (typically dark brown or near-black). The DMC equivalents most commonly cited in reconstruction work: background rust = DMC 815 (medium garnet) or 816 (garnet); background blue = DMC 820 (very dark royal blue) or 797 (royal blue); background green = DMC 500 (very dark blue green); outline = DMC 938 (ultra-dark coffee brown) or 3371 (black-brown).

Contemporary Assisi makers have broadened the palette significantly. Two-color backgrounds (alternating bands of two close values — DMC 815 and 814 alternating every 8 rows) create a subtle stripe that reads as a single color at distance but reveals variation in close viewing. Four-way compositions use different background colors in each quadrant, creating a heraldic quartered-field effect. Some makers use variegated Holbein thread for the border while keeping the interior Holbein outline solid — the variegation reads as a decorative element at the margins without disrupting the central motif void.

Color value contrast is the primary design parameter: the background fill must contrast enough with the unstitched linen ground to make the motif legible. On natural unbleached linen (a warm cream-beige), both dark and mid-value colors provide enough contrast. On white evenweave or white Aida, dark background colors (navy, forest green, deep garnet) work well; pastel backgrounds can get lost against white fabric. The Holbein outline, in a darker value than the background fill, maintains its visual separation even where the two elements share similar hues — it is always at least two value steps darker than the fill.

Patreon tier structures for Assisi embroidery creators

Assisi embroidery supports tier structures built around a clear hierarchy: pattern complexity scales cleanly from bookmark to full panel, and the historical depth of the tradition supports educational content alongside pure pattern access. Tutorial content — particularly the counterintuitive chart inversion workflow and the Holbein stitch two-pass method — is not well-covered by free YouTube content, creating genuine subscription value.

$5/month (Anchor tier): One PDF chart per month. Beginner-sized format: 28×98 stitch bookmark or 42×42 stitch motif square. Chart includes: grid chart with background fill symbol pre-marked, Holbein outline trace, color key with DMC numbers and Anchor equivalents, stitch count, and recommended fabric/thread combinations. PDF delivered on the first of each month.

$12/month (Holbein tier): Two PDF charts plus one technique video per month. Chart size expands to intermediate: 56×84 stitch panel (approximately 4×6 inches on 28-count/2 threads). Video content (10–18 minutes): rotating topics including Holbein stitch two-pass demonstration, background fill diagonal-row method, corner execution under magnification, fabric pre-washing protocol, and centering method for large pieces. Access to archive of all previous charts.

$20/month (Griffin tier): Full design access tier: two charts (one traditional, one contemporary colorway) plus one design tutorial per month. Design tutorials walk through the complete workflow of converting a heraldic source image to an Assisi chart: source selection, silhouette extraction, grid scaling, Holbein path tracing, background fill marking, and border integration. Patrons who complete the tutorial series can design original Assisi patterns independently. Early access to seasonal special releases (Christmas, Easter, heraldic commission packs).

$35/month (Linen tier): Includes all Griffin tier content plus one custom chart element per quarter: patrons submit a source image (coat of arms, family crest, bird species, architectural detail) and receive a chart adapted to Assisi format at their chosen stitch count and final size. Includes a finishing guide PDF covering blocking, mounting, and framing for each quarterly chart. Community: access to a private monthly critique session where patrons share work in progress.

Retention mechanics: the design tutorial series at the Griffin tier creates a structured learning arc that supports long-term subscriptions — completing the series (typically 8–12 months of content) gives patrons a marketable skill, and patrons who gain that skill become invested in the community. The pattern archive compounds in value monthly. Seasonal releases (Advent calendars in 12 daily-size charts delivered in December, for example) generate high engagement and new patron acquisition in Q4.

Photography and content strategy for Assisi embroidery Patreon

Assisi embroidery photographs well under specific conditions. The optimal setup: natural north-facing window light (diffuse, no direct sun) angled at 20–30° to the fabric surface to show cross-stitch texture without creating hot-spot reflections on the linen. The motif void reads clearly because the untouched linen reflects light differently than the stitched background. A neutral gray or deep teal backing card (not white — white flattens the contrast between linen and background fill) makes the composition stand out in grid-format feeds.

Progress photographs perform consistently well on Instagram for Assisi work because the background-fill-in-progress stage shows an intriguing negative space taking shape — the motif void becomes visible as the surrounding fill grows. Time-lapse and stop-motion processes of the background fill advancing around a griffin silhouette generate engagement from both embroidery and non-embroidery audiences. The unfamiliar inversion of conventional cross-stitch is itself a hook: "I'm stitching everything EXCEPT the bird" reads as a surprise claim in a caption.

Pinterest performs strongly for Assisi work because the heraldic and historical aesthetic aligns with the medieval, cottagecore, and historical craft communities on the platform. A 2:3 ratio infographic showing the three-step process (draw outline → fill background → reveal void) generates consistent saves. Board organization: separate boards for traditional Assisi palettes, contemporary colorways, beginner-size charts, and historical references each serve different search intents.

YouTube: long-form stitch-along content (30–60 minutes per video showing a complete bookmark worked from start to finish, including thread setup, Holbein first pass, return pass under magnification, and background fill) serves the embroidery community's appetite for process documentation. Chapter markers at "starting the Holbein outline," "background fill begins," and "finishing and framing" make the video searchable at each stage. These long-form videos drive Patreon conversions when they reference pattern access at the Griffin tier.

Historical research as subscription content

The documented history of Assisi embroidery provides a layer of content unavailable to tutorials alone. The technique is associated with specific surviving historical pieces — particularly the collection in the Museo del Tessuto di Prato and examples in the Ashmolean Museum's textile collection — and the documentation of those pieces (stitch count, thread type, color analysis, motif provenance) creates genuinely unique educational content.

Primary research directions valuable to Assisi Patreon creators: (1) Medieval bestiary identification — many Assisi motifs derive from illuminated manuscript bestiaries (the Aberdeen Bestiary, the Rochester Bestiary); tracing a motif from surviving embroidery back to its manuscript source and providing both images and the transcript of the bestiary text is deeply engaging for historically-minded subscribers. (2) Dye analysis — historical Assisi backgrounds used madder (rust reds), woad/indigo (blues), and weld (for yellow-greens now faded); explaining the original dye relationships and their modern DMC equivalents is specific knowledge with subscription value. (3) Regional variation — Umbrian Assisi work differs from Roman and Florentine interpretations in border structure and motif density; documenting these regional differences through annotated images structures a multi-month content arc.

Apple Tax mechanics for Assisi embroidery Patreon creators

Apple's in-app purchase requirement applies to all iOS app subscription flows starting November 1, 2026. Patreon operates an iOS app through which patrons browse creators and manage subscriptions. When a patron discovers an Assisi embroidery creator on Patreon's iOS app and subscribes there, Apple processes the subscription as an in-app purchase and retains 30% of the subscription price. Patreon cannot absorb this cost — it passes through to reduced creator earnings on those transactions.

The Assisi embroidery audience is disproportionately iOS-heavy. The primary discovery platforms — Instagram (predominantly iPhone in US/UK/Australia markets), Pinterest (65–72% iOS in US), and YouTube (55–65% iOS for craft audiences) — all index toward Apple device users. A realistic estimate: 70–82% of Instagram-sourced patrons, 66–80% of Pinterest-sourced patrons, and 52–68% of YouTube-sourced patrons sign up via iOS app. The aggregate iOS exposure for an Assisi creator with a typical platform mix runs 68–78%.

Revenue impact at specific tier points, using the formula (subscription × retention rate × 0.30 = Apple Tax per iOS subscriber):

$200/month tier at 72% iOS retention rate: $200 × 0.72 × 0.30 = $43.20/month per iOS subscriber. An Assisi creator with 10 iOS subscribers at this tier loses $432/month. Annual loss: $5,184.

$350/month tier at 76% iOS retention rate: $350 × 0.76 × 0.30 = $79.80/month per iOS subscriber. An Assisi creator with 8 iOS subscribers at this tier loses $638.40/month. Annual loss: $7,660.80.

$500/month tier at 80% iOS retention rate: $500 × 0.80 × 0.30 = $120/month per iOS subscriber. An Assisi creator with 6 iOS subscribers at this tier loses $720/month. Annual loss: $8,640.

These are per-subscriber figures. A creator with 25 patrons total, where 18 are iOS, and a mixed tier distribution averaging $250/month would lose approximately $18 × $250 × 0.74 × 0.30 = $999/month to the Apple Tax — nearly $12,000 annually.

The bypass: KeepTier routes subscriptions through a web checkout that Apple's IAP rules do not govern. Patrons who subscribe via KeepTier's web link — bookmarked in the browser or shared as a direct URL — complete payment outside the Patreon iOS app flow. Apple cannot claim the 30% IAP fee on web transactions. For Assisi embroidery creators, putting a KeepTier subscribe link in the Patreon bio, in all Instagram bio links, and in Pinterest profile links captures the web-browser traffic that bypasses iOS entirely.

Practical workflow: launching an Assisi embroidery Patreon in 30 days

Week one: content preparation. Produce three charts at different sizes: one bookmark (28×98, beginner), one intermediate square motif (56×56), and one panel (56×84). Choose a heraldic animal for all three — a griffin is ideal because it appears in numerous historical pieces and has documented stitch-path references. Produce each chart in PDF format with full stitch key, color notes, and fabric recommendation. Photograph each chart with a finished sample or a substantial work-in-progress.

Week two: video content. Record a 15-minute Holbein stitch tutorial: setup, first-pass running stitch, second-pass gap-filling, corner pivot under magnification, starting and finishing thread. Record a 10-minute background fill tutorial: diagonal row method, managing the motif boundary, thread tension consistency. These two videos constitute the core technique library.

Week three: page setup and pricing. Configure three tiers (Anchor at $5, Holbein at $12, Griffin at $20). Upload the three charts and two videos to the appropriate access levels. Write tier descriptions emphasizing the chart archive growth over time — after 12 months, an Anchor patron has 12 charts; after 24, 24. This cumulative value argument supports long-term retention. Set the KeepTier web-subscribe link in the profile and all bio links.

Week four: launch content and cadence. Post a launch reel on Instagram showing the three-step Assisi process (outline → fill → void revealed). Post a Pinterest infographic: "What is Assisi embroidery?" with the inversion concept explained visually. Share a YouTube preview of the Holbein stitch tutorial. Email the launch announcement to anyone on an existing craft mailing list. The goal for month one: 10–15 patrons across tiers, establishing the pattern delivery cadence before growing the audience.

Frequently asked questions

What is Assisi embroidery and how does voided cross-stitch work?

Assisi embroidery is an Italian counted-thread technique from Assisi, Umbria, where the design motif is deliberately left unworked while the surrounding background is filled with cross-stitch — the inverse of conventional embroidery. The motif becomes a void, defined only by its Holbein-stitch outline and the surrounding stitched field. This voided approach originated in medieval church linen production (13th–16th century) and was formalized in the early 20th century revival. Traditional motifs include heraldic animals (griffins, lions passant, eagles displayed), Gothic and Renaissance border patterns, and stylized plant forms. A complete Assisi composition has three elements: (1) a double running stitch outline tracing the motif boundary, (2) a solid cross-stitch fill covering the background, and (3) optional secondary borders in running or Holbein stitch.

How does double running stitch (Holbein stitch) work for Assisi outlines?

Double running stitch is a two-pass technique producing identical stitching on both fabric faces. First pass: work running stitches along the design line, leaving gaps between each stitch equal to the stitch length. Second pass: travel back along the same path, filling the gaps. On 28-count evenweave over 2 threads, each stitch covers 2 fabric threads with a 2-thread gap. Corner execution: work to within one stitch of the corner on the first pass, then pivot 90° on the return. Curve approximation: use two-thread stitches for tight curves to reduce visible faceting. Thread tension on the second pass must be relaxed — the second-pass thread must lie flat without compressing the first-pass stitches.

How do you read an Assisi chart differently from a standard cross-stitch chart?

Assisi charts use inverted convention: a filled background symbol means stitch the background cross-stitch color there, while the empty white area (the motif outline) means leave fabric bare. Three visual layers: (1) heavy line = Holbein outline color, (2) uniform fill symbol = background cross-stitch color, (3) blank squares inside motif boundary = the void. When designing charts, draw the motif normally in software, then invert — clear the motif and fill the background. Stitch count: on 28-count over 2 (= 14/inch), a 4×6 inch panel is 56×84 stitches.

What fabric, thread, and needle work best for Assisi embroidery?

Best fabric: 28-count evenweave (Zweigart Cashel or Edinburgh) over 2 threads (14 stitches/inch) for intermediate work; 18-count Aida for beginners. Thread: 2 strands DMC stranded cotton for 28-count over 2; 3 strands for 18-count Aida. Traditional background colors: DMC 815/816 (garnet), 820/797 (royal blue), 500 (dark green), 433/436 (golden brown). Holbein outline: DMC 938 (ultra-dark coffee) or 3371 (black-brown). Needle: tapestry size 24 for 28-count; size 22 for 18-count.

How much Apple Tax do Assisi embroidery Patreon creators lose on iOS subscriptions?

Apple mandates a 30% in-app purchase fee on all iOS Patreon subscriptions starting November 1, 2026. For Assisi creators with Instagram/Pinterest audiences at 70–82% iOS exposure: $200/mo tier at 72% retention = $200 × 0.72 × 0.30 = $43.20/mo per iOS subscriber; $350/mo at 76% = $79.80/mo; $500/mo at 80% = $120/mo. A creator with 18 iOS patrons averaging $250/mo loses approximately $999/mo to the Apple Tax. KeepTier routes subscriptions through web checkout, bypassing Apple's IAP fee entirely.