Subscription App Development Agency
Codixus is a product studio shipping recurring revenue mobile apps end-to-end. RevenueCat, paywall placement, price experiments, churn cohorts, lifecycle messaging. Starter from $2,749.
Subscription apps are not a feature you add at the end. They are an architecture decision on day one. One opinionated stack covering IAP and entitlements, the mobile layer, backend, lifecycle messaging, AI features, and product analytics. We run our own subscription apps in production, including CurtainAI on a subscription model. We bring the patterns, the dashboards, and the post-launch retention work that turns paid downloads into recurring revenue.
What we ship
A subscription app from Codixus comes with the full recurring-revenue stack wired up correctly the first time, so you spend launch day shipping the product instead of debugging receipt validation.
RevenueCat integration
Full RevenueCat setup with offerings, packages, entitlements, server-side webhooks, customer attributes, and revenue analytics. iOS, Android, and web purchase flows where applicable.
Paywall + onboarding
Paywall design and placement tuned to the moment of value. Onboarding flows that pre-qualify intent before the price reveal. Restore purchases, terms and privacy disclosures that pass App Store review.
Cross-platform mobile
React Native with Expo for one codebase shipping to iOS and Android. EAS Build, EAS Update for over-the-air patches. Native modules where they matter.
Backend + auth
Bun runtime on the API layer, Supabase for Postgres, auth, storage, and realtime. Server-side entitlement enforcement so a tampered client cannot fake a subscription.
Push + lifecycle
OneSignal lifecycle campaigns timed to subscription events: trial start, trial expiring, renewal upcoming, cancelled win-back. Timezone-aware sends, segment targeting.
AI features
Anthropic Claude and OpenAI for AI-powered subscription apps, with cost guardrails so a viral spike does not destroy your unit economics. We will tell you the per-active-user inference cost up front.
Analytics + experiments
Litemetrics for product analytics, RevenueCat charts for MRR and churn, paywall A/B experiments, price tests, and cohort analysis to find the segments worth doubling down on.
ASO + organic
App Store Connect ASO with iterating keywords and screenshots, Google Search Console integration for the marketing site, blog content targeted at the categories your audience already searches.
Why founders choose Codixus for subscription apps
Own-brand subscription apps
CurtainAI runs on a subscription model in production. Flast, BeJudge, FiberCheck, OKNOK, PassThePhone, Bluffin, and PromptJr all run on the same RevenueCat stack we will set up for you. We have paid the production tuition.
End-to-end studio, not a body shop
Design, engineering, App Store submission, paywall optimization, lifecycle messaging, and post-launch iteration live under one accountable team. No hand-offs to a separate growth agency or paywall consultant.
Subscription-native architecture
Every architectural decision is made knowing this is a subscription app: server-side entitlements, churn-aware push timing, paywall instrumentation hooked to product events, refund handling that does not rely on manual intervention.
Transparent fixed-scope pricing
Starter from $2,749. Pro and Enterprise tiers published publicly. No hourly billing surprises, no scope creep invoiced quietly. You know the budget before we write the first line of code.
Our subscription app delivery approach
Discovery
One-week sprint to lock the pricing structure, the paywall placement hypothesis, and the metric that matters. Output is a fixed scope and a unit economics model.
Design + build
Three to six weeks of design and engineering. RevenueCat wired in week one so paywall and entitlement code is exercised the entire build, not bolted on at the end.
Launch + ASO
App Store and Play Store submission, subscription metadata, screenshots that emphasize value before price, reviewer notes that pre-empt subscription policy rejections.
Operate + iterate
Three months of paywall experiments, lifecycle campaigns, churn cohort analysis, and price tests. The retention work that compounds recurring revenue.
Featured subscription work from our portfolio
Three of the subscription apps Codixus designed, built, launched, and operates today.
CurtainAI
AI curtain visualizer on a subscription model. Monthly and annual paywall, RevenueCat-driven offerings, paywall A/B test currently running between weekly and monthly anchors.
Flast
AI productivity tool with paid subscriptions across global markets including MENA. RevenueCat for IAP, server-side entitlement enforcement, churn-aware push lifecycle.
BeJudge
AI verdict app with paid subscription tier. RevenueCat IAP, paywall placement post-onboarding, lifecycle campaigns timed to the high-engagement weekend window.
Transparent subscription app pricing
Starter projects begin at $2,749 and cover a focused MVP with RevenueCat, App Store and Play Store IAP configuration, paywall, restore purchases, and entitlement gating. Pro and Enterprise tiers scale scope, lifecycle work, and team size.
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