Vertical Boilerplate · AI · iOS

AI App Boilerplate for iOS — Ship a SwiftUI AI App in 5 Minutes

OpenAI streaming, Anthropic Claude, Apple Foundation Models, paywall, auth, rate limiting — all pre-wired. The Swift Kit is the AI app boilerplate for indie iOS developers in 2026.

Last updated: 2026-05-16 6 min read By Ahmed Gagan, iOS Engineer

Quick Answer

The Swift Kit is the most complete AI app boilerplate for iOS in 2026 — OpenAI streaming chat, Anthropic Claude, Apple Foundation Models, complete chat UI with markdown rendering, RevenueCat paywall, Supabase auth + rate limiting, TelemetryDeck analytics, AI-tuned onboarding flows. $99 one-time. Replaces $15k–$80k of agency work. Indie developers ship polished AI apps in 3–7 days using it.

Price

$99 one-time

Time to MVP

3–7 days

AI providers

OpenAI · Anthropic · Apple Foundation Models

What's pre-wired

~60% of generic AI app scope

What's in the AI App Boilerplate

Everything you need to ship a production AI iOS app:

OpenAI streaming chat (GPT-4o-mini, GPT-5) via AsyncSequence
Anthropic Claude integration (Haiku, Sonnet 4.6) with prompt caching support
Apple Foundation Models scaffolding (iOS 18+) for free on-device inference
Complete chat UI with markdown rendering, code blocks, auto-scroll, regenerate
RevenueCat paywall with free/premium tier gating
Supabase auth (email, Sign in with Apple) + Postgres + Storage
Per-user rate limiting via Supabase Edge Functions
Onboarding flows tuned for AI apps (3 styles)
TelemetryDeck analytics + Sentry crash reporting
OpenAI function calling + Anthropic tool use, type-safe Swift wrappers
Centralized design system — 5 surface styles incl. Liquid Glass
App Store screenshot templates + description generator

Why Not Build From Scratch?

The math is brutal. Building an AI iOS MVP from scratch in 2026 costs $6k–$20k of your own time (3–6 weeks) or $30k–$80k of agency work (3–5 months). The Swift Kit is $99, 60% of the work is done, and you keep full source code with lifetime updates.

Setup in 5 Minutes

Three commands, then ship.

Quick start

git clone <swift-kit-repo> MyAIApp
cd MyAIApp
./setup.sh   # Interactive CLI: app name, brand colors, API keys, AI provider preset

The Free-Tier / Premium-Tier Pattern

The pricing pattern that maximizes AI app conversion in 2026:

Free tier: Apple Foundation Models (on-device, unlimited, fast) → no inference cost
Premium tier: OpenAI GPT-4o-mini or Claude Haiku → great quality, ~$0.50/user/mo cost
Pro tier: GPT-5 or Claude Sonnet 4.6 → reasoning-heavy, ~$2/user/mo cost
Paywall gates premium models behind subscription — Apple FM stays free forever

Real-World Example

An indie developer using The Swift Kit shipped a single-purpose AI utility (text rewriter for non-native speakers) in 6 days. Stack: Apple Foundation Models for free tier, Claude Haiku for premium. $4.99/mo. Hit $1.2k MRR within 60 days of launch. The point isn't that result; it's that the boilerplate removed every undifferentiated piece of work.

Swift Kit AI Boilerplate vs Building From Scratch

Swift Kit vs From scratch comparison
Feature	Swift Kit	From scratch
Cost	$99 once	$6k–$20k of time
Time to MVP	3–7 days	6–10 weeks
OpenAI streaming chat		You build
Claude integration		You build
Apple Foundation Models		You build
Markdown chat rendering		You build
RevenueCat paywall		You wire
Supabase auth		You wire
Rate limiting	Server-side, ready	You build
Function calling / tool use	Type-safe wrappers	You implement
Onboarding (AI-tuned)	3 styles	You design
Source code ownership	Full, lifetime	Full
Updates	Free for life	N/A

Frequently Asked Questions

What's included in the Swift Kit AI app boilerplate?

Everything you need to ship a production AI iOS app: OpenAI streaming chat integration, Anthropic Claude support, Apple Foundation Models scaffolding, a complete chat UI with markdown rendering, RevenueCat paywall, Supabase auth + rate limiting, TelemetryDeck analytics, onboarding flows tuned for AI apps, and App Store assets. All pre-wired, $99 one-time.

How long does it take to ship an AI iOS app with this?

3–7 days for a polished MVP. The 60% of an AI app that's generic (auth, paywall, streaming UI, rate limits, analytics) is done. You build the 40% that's your unique product — prompts, use case, brand.

Can I use Apple Foundation Models for free-tier features?

Yes — and this is the recommended pattern. Apple Foundation Models (iOS 18+) are free, on-device, and unmetered. Use them for free-tier features (summarization, rewriting), and reserve OpenAI / Anthropic for premium-tier features (reasoning, long context). This pricing strategy doubles paywall conversion.

How does rate limiting work?

Supabase Edge Functions enforce per-user daily quotas server-side. Free users get N requests/day, premium users are unlimited (or have a higher cap). The Swift Kit ships the rate-limit primitive + UI flow (show paywall when limit hits).

Does it support function calling / tool use?

Yes — both OpenAI function calling and Anthropic tool use are supported with type-safe Swift wrappers. Define a Codable response schema, register tools, and the chat ViewModel routes responses correctly.

Can I use this for non-chat AI apps?

Yes. While the included chat UI is the most visible piece, the underlying primitives (OpenAI client, streaming, rate limiting, paywall gating, prompt caching) work for any AI use case — image generation, summarization, classification, search.