GrapheneOS bundles the AOSP keyboard which was the open source code from Google Keyboard back in 2014/2015 before the rebrand to Gboard. GrapheneOS disables personalized sughestions by default.
Gboard is probably going to be the best option for most users as it's a modern, well maintained, high quality keyboard app with support for most languages and predictive text/spellcheck. You should opt out of the usage stats in Gboard -> Privacy.
HeliBoard is a fork of OpenBoard which was a fork of the AOSP Keyboard. It has a lot of features in comparison and is overall a good app but still lacks a modern dictionary (it's about 10 years out-of-date, it has no clue what COVID is...)
FUTO Keyboard is a fork of the AOSP Keyboard but has gone in a very different direction to the other forks. They've added a better dictionary than even Gboard as well as on-device speech-to-text via OpenAI Whisper. Transcribro is an open source option which also uses OpenAI Whisper for speech-to-text.
The only current alternative keyboard app which could become viable to replace AOSP Keyboard in GrapheneOS is FlorisBoard due to being permiesively licenced and a high quality app. It current lacks features even the AOSP Keyboard has such as predictive text/spell checking so it's not ready yet. They plan to add word suggestions in v0.5.
- Obtainium (via GitHub)
FUTO Keyboard 🟥
- Play Store
- Obtainium (via GitHub)
- Obtainium (via GitHub)