Building an AI Keyboard for iOS: What They Don't Tell You About Keyboard Extensions

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Building an AI Keyboard for iOS: What They Don't Tell You About Keyboard Extensions TL;DR: I built SmartReply — an iOS system keyboard that reads messages (from clipboard or screenshot OCR), sends them to an AI backend (DeepSeek), and drops 5 reply candidates right into your chat app. The hardest parts aren't the AI calls. They're the iOS sandbox, the process isolation, and StoreKit 2 inside an extension. Here's what I learned. AI keyboards aren't new.

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