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: 2026-06-19 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

Your OpenAI & Claude API Key, Kept Secure

Hard-coding an OpenAI or Anthropic key in the app ships it to every user — anyone can extract it from the binary and run up your bill. The Swift Kit routes AI calls through a server proxy (Supabase Edge Functions), so your keys live server-side and never reach the device. The same layer enforces per-user rate limits and lets you swap providers without an app update. It is the security pattern every serious AI app needs, already wired.

Build a ChatGPT-Style App in iOS

Want a ChatGPT-style chat app? The streaming chat UI is the centerpiece — token-by-token streaming via AsyncSequence, markdown and code-block rendering, auto-scroll, stop and regenerate, and conversation history. Point it at OpenAI or Claude, set your system prompt, and you have a working ChatGPT-style iOS app on day one. From there it is your prompts, your use case, and your brand — not weeks of plumbing.

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.

How It Compares to Other AI Boilerplates

The two best-known paid SwiftUI AI boilerplates are WrapFast and SwiftAI Boilerplate Pro. Here is the honest picture:

Price — The Swift Kit is $99 one-time, the same as SwiftAI Boilerplate Pro and well below WrapFast ($299).
On-device AI — only The Swift Kit ships Apple Foundation Models scaffolding, so free-tier features run on-device at zero inference cost; neither competitor offers this.
Providers — OpenAI and Anthropic Claude are both pre-wired here; WrapFast leans OpenAI-first and SwiftAI routes through OpenRouter.
Beyond AI — The Swift Kit is a full app foundation (design system, onboarding, paywall, auth) you re-skin from one file, not only an AI wrapper.

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.

Is this a ChatGPT app boilerplate for iOS?

Yes. The Swift Kit ships a complete ChatGPT-style streaming chat UI wired to OpenAI (and Anthropic Claude), so building a ChatGPT-style iOS app is a same-day task. You bring the system prompt and use case; the chat interface, token streaming, markdown rendering, and paywall gating are already built.

How is this different from WrapFast or SwiftAI Boilerplate Pro?

All three are paid SwiftUI AI boilerplates. The Swift Kit is $99 (the same as SwiftAI Boilerplate Pro, and below WrapFast's $299), is the only one shipping Apple Foundation Models for free on-device inference, pre-wires both OpenAI and Anthropic Claude, and is a full app foundation — design system, onboarding, paywall, auth — that you re-skin from one file, not just an AI wrapper.

How do I keep my OpenAI API key secure?

Never ship the key inside the app — anyone can extract it from the binary. The Swift Kit routes AI requests through a Supabase Edge Function proxy, so your OpenAI and Anthropic keys stay server-side and never reach the device. The same proxy enforces per-user rate limits and lets you change providers without an App Store update.

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.

Can I get a refund?

Yes. The Swift Kit comes with a 14-day refund guarantee — if it is not the right fit, email for a full refund within 14 days of purchase. You also keep full source code and lifetime updates once you buy.