Thumb-Key supports thumb-based text input through an Android keyboard designed with privacy-conscious handling.
Layouts Guide
This guide explains how to add, edit, and customize layouts for a customizable, privacy-conscious open source keyboard.

About Layouts Guide
This is a wiki page from the HeliBoard project on GitHub. It explains how to add, edit, and customize keyboard layouts in HeliBoard, an open source keyboard that its description calls customizable and privacy-conscious. The main layout can be changed under Languages & Layouts when the system languages option is disabled. Other keyboard parts, such as symbols, number, phone, and emoji or clipboard rows, are changed through the Secondary Layouts settings.
Layouts are written in a JSON format, which is the most flexible option but can be hard to edit in the app's text box. Simple layouts are easier to change. The page also notes that some functional-key and symbol layouts are outdated and may be removed in future versions. Technical implementation details are in a layouts.md file in the project repository. Pricing is unknown.
Key features
- Add a custom layout by importing a file or copying an existing layout
- Edit the main keyboard layout under Languages & Layouts
- Customize secondary layouts for symbols, numbers, numpad, and phone input
- Edit number row and emoji or clipboard bottom row layouts
- Define keys in JSON with labels, types, and widths
- Add comment lines in JSON layout files that the app ignores
- Documents step-by-step instructions for adding and editing layouts
- Covers many keyboard parts, from the main layout to number and phone input
- The JSON format may be cumbersome, especially when using the internal text box editor
- Some functional and symbol layouts are described as outdated and might be removed
- Layouts in advanced settings can be edited but cannot be loaded from files directly
Layouts Guide at a glance
- Category
- Mobile Apps › Android Apps
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
Layouts Guide alternatives
Tools and sites you could use instead, ranked by how closely they match.
HeliBoard provides a customizable keyboard for Android with a focus on privacy and open-source development.
Outspoke offers privacy-focused speech-to-text input as an Android keyboard, converting spoken words into text.
FlorisBoard provides a free, open-source keyboard for Android and includes a privacy-focused design.
TranslateYou offers translation across more than 150 languages and several translation services in a privacy-focused Android app.
WallYou offers wallpaper browsing, downloads, and automatic changes in a privacy-focused Android app.
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Layouts Guide FAQ
How do I add a custom layout in HeliBoard?
Can I load every layout type from a file?
Where can I find the technical details of the layout implementation?
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