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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