I built a custom keyboard iOS app — here's what I learned about keyboard extensions

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As a solo iOS developer, I wanted to share some technical insights

from building Clip Keyboard — a custom keyboard extension for iOS.

The Challenge

iOS keyboard extensions are sandwiled. They have limited memory,

restricted API access, and users are naturally suspicious of

third-party keyboards (rightfully so).

Key Technical Decisions

1. 
   No Full Access required for core features


2. 
   CloudKit for sync instead of custom backend


3. 
   Auto-categorization using regex + NLP patterns for 15 content types


4. 
   Combo Mode — sequential text injection with configurable delays

What I'd Do Differently

• Start with fewer categories (15 was ambitious)


• Add onboarding sooner (users didn't discover keyboard setup)


• Focus on one killer use case for marketing

If you're building keyboard extensions, happy to answer questions.

🔗 App Store | Built with Swift & SwiftUI

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