Apple Deleted Your Attribution Data. Zellify Brought It Back.

01 /The Concept

In 2021, Apple changed how data flows between an ad click and an App Store install. The change arrived as a privacy feature: users would opt in to cross-app tracking rather than opt out. Most developers focused on the opt-in rate — how many users would consent. They missed the larger shift. For every user who declined, the attribution chain between paid advertising and subscription conversion was severed. The revenue continued arriving in Stripe; the signal about what drove it disappeared.

The practical consequence took months to become visible and years to become intolerable. A subscription app spending $100,000 a month on Meta and Google could no longer see which creative, which audience, or which placement had driven that month's new subscribers. Every optimization decision — bid adjustments, creative rotation, audience expansion — became educated guesswork against blended averages.

Zellify solves this through a Web2App funnel: a custom web-based onboarding and payment flow that exists outside the App Store. A user clicks an ad, lands on a branded web page, creates an account, and pays — before the app is ever involved. Every event in that sequence is attributable through standard web tracking. Apple's App Tracking Transparency framework doesn't apply. After payment, the user receives a download link that routes them to the App Store install.

The 30% App Store commission also disappears in this model — payment processes through the developer's own stack, not Apple's. But for most developers who've engaged seriously with the problem, the attribution restoration is the larger operational benefit. The margin saving is a bonus that compounds on top.

Zellify launched in June 2025 and has processed approximately $10M in GMV. In April 2026, the company raised €3.1M in seed funding led by Connect Ventures with participation from FJ Labs, Inovia, and Dreamcraft Ventures. The founders, Marcus Persson and Nils Nygren Liljenstrand, are both 20.

02 /Why It Matters

There are approximately 35,000 subscription-based apps on the App Store generating meaningful revenue. The largest categories — health, fitness, productivity, education — share a common economic profile: high-intent users, multi-year retention curves, and paid acquisition as the primary growth channel. The average subscription app above $1M in ARR spends 30-50% of revenue on paid acquisition.

For those apps, attribution isn't an analytics nicety — it's what determines whether the paid acquisition program is building a business or burning cash. Without it, a developer running a $50,000 monthly media budget can confirm total subscriber growth but not whether the incremental campaign produced subscribers who convert, retain, and generate enough LTV to justify the spend. The only alternative is channel blackout experiments — pause Meta for a month and measure downstream impact. That method costs time, growth, and confidence.

When attribution is restored through a web funnel, a specific math becomes available: channel-level ROAS, broken down by creative, by audience, and by network. That granularity tends to produce 20-40% improvements in acquisition efficiency for teams that know how to use it — not because the media got better, but because budget allocation finally tracked reality.

The 30% commission saving is real but secondary. At $1M ARR with 30% paid to Apple, that's $300,000 annually. Meaningful, but recoverable through pricing or efficiency gains over time. The attribution gap, left unaddressed, compounds: every dollar on paid acquisition flies partially blind, and the miscalculation accumulates at scale.

03 /Opportunities

The Zellify model belongs to a broader pattern: platforms that help digital businesses capture margin and measurement that a dominant distribution layer has been extracting. The same structural problem exists on Amazon, where third-party sellers build off-platform acquisition funnels to establish direct customer relationships; on Etsy, where top sellers build email lists to reduce algorithmic dependency; and across any B2B software channel where a marketplace has accumulated data leverage over the sellers it hosts.

The specific opportunity is in categories where the web payment flow is legally available but operationally unintuitive — where developers know the path exists but haven't built it because it requires payment processing expertise, compliance work, and UX design they don't have in-house. Mental health, wellness, and fitness subscription apps face this most acutely: the subscription has clear LTV math, paid acquisition is the dominant growth mechanism, and attribution loss is directly visible in declining return-on-ad-spend since 2022.

The constraint here is Apple itself — and that constraint is also the moat. The rules governing out-of-app payment flows change on a 12-18 month cycle as Apple responds to court rulings and regulatory pressure. What Zellify tracks is not just the product it builds but the evolving legal map: which jurisdictions permit web payment flows, under what conditions, with what disclosure requirements. A developer who builds an in-house web2app funnel in 2024 will spend engineering time in 2026 and again in 2028 maintaining compliance as the rules shift. Zellify's value isn't the initial setup — it's the ongoing legal maintenance, delivered as infrastructure. That ongoing cost is the reason the market won't build this themselves, and the reason a platform player will hold the position.