
TestFlight
FreeDuo-native
Install and test beta builds of apps
On the Duo: Duo-native. Its maker's site shows the TabForge keyboard on the open Duo. Checked November 5, 2026.
App Store data as of October 27, 2026

Anyone expecting hardware-key events in terminal or remote apps, which a keyboard extension cannot send.
TabForge is a programming keyboard for iPhone and iPad with brackets, full ASCII punctuation, Tab or space indentation, arrow keys, Escape and Control, Option and Command keys. It saves snippets, suggests words for Swift, Python, JavaScript, TypeScript, Shell and JSON, and offers profiles for code editors, terminals and remote desktops. Optional extras include on-device prose autocorrect, experimental swipe typing, and a companion app with a syntax-highlighting playground and voice-to-code dictation. All features are free, with an optional tip jar.
On the iPhone Duo, its description says supported Duo layouts show more controls, and its maker's site shows the keyboard on the open Duo.