Native iOS apps built to pass review and keep earning
Swift and SwiftUI, written by senior engineers who have shipped through App Store review many times. Fast apps, clean releases, subscriptions that bill correctly.
We build iOS apps in Swift and SwiftUI, the way Apple intends them to be built. No wrappers, no web views pretending to be apps. Native code means your app launches fast, scrolls smoothly, and picks up new OS features the day they ship. It also means fewer surprises in App Store review, because reviewers see a real iOS app that follows platform conventions. Etlon has been shipping software since 2001, and the engineers who write your Swift are the same people who ran video ingest and edge delivery at Break.com when it was the internet's #1 video site. We know what production load does to an app. Every project gets an architecture that handles offline states, flaky networks, and background limits before your users find them the hard way.
The App Store is a gate, and we have been through it many times. We plan for review from the first sprint: privacy manifests, entitlement justifications, in-app purchase rules, and the small details that trigger rejections. TestFlight builds go out early, so you and your testers see real progress on real devices instead of demos on a laptop. If your business runs on subscriptions, we build StoreKit flows that handle upgrades, downgrades, refunds, and receipt validation correctly, because billing bugs cost you money and reviews. When the app is live, you get a release pipeline that builds, signs, tests, and submits without anyone copying certificates around by hand. Shipping version two should be boring.
- A native Swift and SwiftUI codebase you own outright, documented and structured so any competent iOS engineer can pick it up
- TestFlight distribution from the first weeks, so stakeholders test real builds on real iPhones for the whole project
- Offline-first data handling: the app stays useful on the subway and syncs cleanly when the connection comes back
- StoreKit subscriptions and in-app purchases wired correctly, including receipts, refunds, and the edge cases that quietly break revenue
- Push notifications with sane permission prompts, deep links that land users on the right screen, and delivery you can measure
- An automated release pipeline covering signing, testing, and App Store submission, plus a rejection playbook if Apple pushes back
How we work
Scope and architecture
We define what the app must do, pick the data and sync model, and flag anything likely to cause review trouble before code is written.
Build on TestFlight
Working builds go to your testers' phones every week, so feedback lands while it is still cheap to act on.
Harden and submit
We test offline behavior, push, and purchases on real devices, finish the privacy and compliance work, and submit for review.
Ship and iterate
After launch we watch crash reports and analytics, fix what matters, and keep the release pipeline turning out updates.
Work we have shipped
DraftEdge
Machine-learning player projections that keep pace with live injury news right up to lineup lock.
ML pipeline in production Read the case studyStockZ & The Whisper Number
Real-time market data, earnings estimates, and whisper numbers — where a stale figure costs the user money.
Real-time through peak load Read the case studyCommon questions
Cross-platform tools are fine for simple apps, and we will say so when that is true for yours. But if your app depends on performance, offline behavior, subscriptions, or anything close to the hardware, native Swift removes an entire layer of things that can go wrong. It also ages better: when Apple ships a new OS feature, you can adopt it that week instead of waiting for a framework maintainer.
We treat rejection as an engineering problem, not a crisis. Most rejections come from a known list: privacy declarations, purchase rules, misused entitlements, incomplete metadata. We design around that list from day one, which prevents most of them. When a rejection does happen, we read the exact citation, fix or appeal within days, and resubmit.
Yes. We start with a paid audit: we read the code, check the crash rate, review the release setup, and tell you plainly what is solid and what is not. You get that assessment in writing, with costs, before committing to anything larger. Then we stabilize first and add features second.
Tell us what the app needs to do. An engineer replies within one business day.
One business day. From an engineer. No sales sequence.
or email customers@etlon.net