HeliBoard is a privacy-conscious and customizable open-source keyboard, based on AOSP / OpenBoard. Does not use internet permission, and thus is 100% offline.

Author

• Helium314  https://github.com/Helium314/HeliBoard 
• The code is licensed under the GNU 3.0 https://github.com/Helium314/HeliBoard/blob/main/LICENSE-GPL-3

Features

• Add dictionaries for suggestions and spell check
• build your own, or get them here, or in the experimental section (quality may vary)
• additional dictionaries for emojis or scientific symbols can be used to provide suggestions (similar to "emoji search")
• note that for Korean layouts, suggestions only work using this dictionary, the tools in the dictionary repository are not able to create working dictionaries
• Customize keyboard themes (style, colors and background image)
• can follow the system's day/night setting on Android 10+ (and on some versions of Android 9)
• can follow dynamic colors for Android 12+
• Customize keyboard layouts (only available when disabling use system languages)
• Customize special layouts, like symbols, number, or functional key layout
• Multilingual typing
• Glide typing (only with closed source library ☹️)
• library not included in the app, as there is no compatible open source library available
• can be extracted from GApps packages ("swypelibs"), or downloaded here (click on the file and then "raw" or the tiny download button)
• Clipboard history
• One-handed mode
• Split keyboard (only available if the screen is large enough)
• Number pad
• Backup and restore your settings and learned word / history data

Integrated Advertisement Support

• • Multyple Ads : ADMOB, FACEBOOK ADS, UNITY and PANGLE
  • Optimized ad placements to maximize revenue without disrupting user experience.

Update:

25 September 2024, Version 1.1

• • Add Module Multyple Ads : ADMOB, FACEBOOK ADS, UNITY and PANGLE
  • New SDK for Ads