How to build an AI chatbot app for iOS
What an AI chatbot app needs
- A chat view with user and assistant bubbles and a typing indicator
- Streamed responses so text appears as the model writes it
- Conversation history that persists and can be reopened
- A system prompt that defines the assistant's role and tone
- A backend that holds the API key and calls the model
- A sensible limit or quota so costs do not run away
- Optional content moderation on inputs and outputs
A focused chatbot, one that does a specific job well, tends to beat a generic "ask anything" clone both in usefulness and in App Store review.
How to build it with AppFlight
Describe it in plain English, for example: "A chat app with a clean message view, streamed AI replies, saved conversations I can reopen, and a system prompt that makes it a friendly cooking assistant." AppFlight plans the screens, generates native SwiftUI, and launches it in a live simulator so you can send a message and watch the streamed reply. For the model, AppFlight connects OpenAI and keeps the key as a backend secret in your own Supabase, so the app talks to your backend rather than embedding the key. You iterate in plain language, for example adding message credits, a different persona, or image input.
Monetization for an AI chatbot app
Because every message has a real model cost, monetization has to cover usage. The common model is a small free daily quota with a subscription for unlimited or higher-volume messages, sometimes sold as message credits. Add a RevenueCat paywall to manage subscriptions, and use Superwall to test paywall timing, for example showing it after the free quota runs out. Set your price against your expected per-user model spend so heavy users do not run you into a loss.
Shipping it to the App Store
When the app is ready, AppFlight signs the build, uploads to TestFlight, then submits to the App Store with metadata and screenshots from the simulator. If Apple rejects the build, AppFlight reads the reason, works on the fix, and resubmits. For AI chat specifically, disclose third-party AI use, get consent where required, and moderate generated content, since Apple has rejected apps for missing AI consent and for unmoderated user content. Apple reviews every app, so a submission is not the same as an approval, but the whole pipeline runs without you opening Xcode.
FAQ
Where does the AI API key live in a chatbot app?
It should stay server-side, not in the app binary. AppFlight keeps backend secrets like an OpenAI key in your own Supabase, and the app calls your backend, which calls the model. Shipping a raw key inside the app is a common security mistake.
How do AI chatbot apps make money?
Usually a subscription for unlimited or higher-volume messages, sometimes message credits or a daily free quota. A RevenueCat or Superwall paywall manages it. Price to cover your model costs, since each message has a real per-call cost.
Will Apple reject a chatbot that uses a third-party AI?
Not by itself, but you must disclose third-party AI use and get consent where required, and moderate generated content. Apple has rejected apps for missing AI consent and for unmoderated user-generated content, so handle both deliberately.