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LeanType

Private, customizable open-source keyboard with smart productivity tools
New in version 4.2.8
- Fixed input freeze / ANR on punctuation and backspace via O(1) blacklist lookups.
- Fixed fatal NoSuchMethodError crash loop on Android 12 when tapping keys or suggestions.
- Restored vibration intensity scaling when adjusting the haptic feedback slider.
- Added toolbar toggles and JSON layout actions for auto-capitalization and force auto-caps.
- Hardened internal crash reporting in release builds and settings dialog.
- Completed 100% translations for all new features across 25 languages.
LeanType is a fast, privacy-focused, and highly customizable open-source keyboard for Android, built on the solid foundations of AOSP and HeliBoard. Designed for smooth typing, rich ergonomics, and modular productivity, LeanType gives you complete control over your keyboard experience with zero data tracking.

🛡️ Privacy & Offline First:

  • 100% Open Source: No telemetry, no ads, and no background tracking.

  • Strict Data Privacy: Your keystrokes and data remain entirely on your device.

  • Zero Sensitive Permissions: Operates without contacts, location, or intrusive permissions.



⌨️ Ergonomics & Fluid Typing:

  • Gesture Typing: Smooth swipe typing with adjustable sensitivity and preview.

  • Multilingual Support: Multi-language typing with auto-correction, suggestions, and Gboard dictionary import.

  • Trackpad Cursor & Text Editing: Swipe across the spacebar or use the dedicated DPAD text editing panel for precision cursor movement and selection.

  • Floating Keyboard: Native, draggable, and resizable floating window for comfortable multitasking without overlay permissions.

  • One-Handed & Split Modes: Optimized layouts for phones, foldables, and tablets.

  • Hardware Keyboard Support: Full candidate selection and auto-correction for external Bluetooth/USB keyboards.



🎨 Deep Customization & Sound Packs:

  • Material You & Themes: Dynamic system color matching, dark/light themes, and custom background wallpaper with blur.

  • Key Ergonomics: Independent corner radius controls for normal, function, and action keys, plus adjustable key gaps and padding scales.

  • Tactile Key Audio: Built-in low-latency sound engine featuring Cherry MX, Vintage Typewriter, Retro CRT, Soft Velvet, and custom sound pack import.



⚡ Clipboard & Productivity:

  • Smart Clipboard Manager: Search clips in real-time, edit text directly in the toolbar, pin favorites, and 5-second undo for deletions.

  • Inline Math Solver: Type equations directly (e.g., 25*4= or 150-20%=) for instant calculation in the suggestion strip.

  • Dynamic Text Expander: Expand text shortcuts with dynamic variables like date, time, and clipboard content.

  • Screenshot Suggestions: Instant 1-tap sharing and text extraction for recently captured screenshots.

  • Modular Backup & Restore: Selectively export and import your layouts, themes, dictionaries, and clipboard history.



🧩 Modular Input & Plugins:

  • Voice Typing: Accurate on-device speech-to-text powered by Whisper models.

  • Handwriting Recognition: Draw characters and symbols directly on an in-keyboard canvas.

  • Camera & Screenshot OCR: Extract text from real-world documents or screenshots with an in-keyboard viewfinder.

  • In-Keyboard Translation: Translate text instantly via offline models or cloud translation.



🤖 Smart AI Tools (Completely Optional):

  • On-Demand Proofreading: Fix grammar, adjust tone, or rephrase text when you choose to use it.

  • Flexible Providers: Connect to Google Gemini, Groq, OpenAI, or self-hosted local LLMs (Ollama, LM Studio, LocalAI).

  • Custom AI Keys: Program quick toolbar buttons with custom prompt instructions.

  • Fully Opt-in: Network access is only used if you provide an API key and explicitly trigger an AI request.



Built with ❤️ by LeanBitLab.

Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 4.2.8 (4208) suggested Added on Oct 08, 2026

    arm64-v8a armeabi-v7a

    This version requires Android 6.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • change your audio settings
      Allows the app to modify global audio settings such as volume and which speaker is used for output.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • read image files from shared storage
      Allows the app to read image files from your shared storage.
    • android.permission.READ_USER_DICTIONARY
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • android.permission.WRITE_USER_DICTIONARY
    • com.leanbitlab.leantype.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 11 MiB PGP Signature | Build Log

  • New in version 4.2.6
    - Floating Window Layout Fix: Eliminated persistent bottom dead space in floating mode by intercepting framework insets, toggling fitsSystemWindows, and performing clean deferred re-measurement.
    - Flavor Consolidation: Fully merged standardfull into standard, delivering a streamlined two-flavor lineup (standard & offline) with zero sensitive permission overhead.
    - Input Compatibility & Dialer Search: Fixed TYPE_NULL fields in generic search bars and dialer apps by properly respecting explicit sh
  • Version 4.2.6 (4206) - Added on Sep 22, 2026

    arm64-v8a armeabi-v7a

    This version requires Android 6.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • change your audio settings
      Allows the app to modify global audio settings such as volume and which speaker is used for output.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • read image files from shared storage
      Allows the app to read image files from your shared storage.
    • android.permission.READ_USER_DICTIONARY
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • android.permission.WRITE_USER_DICTIONARY
    • com.leanbitlab.leantype.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 10 MiB PGP Signature | Build Log

  • New in version 4.2.5
    - Native Floating Window: Replaced overlay window with native IME window architecture (eliminating SYSTEM_ALERT_WINDOW permission), bottom control bar, and persistent mode memory.
    - Privacy Hardening: Removed READ_CONTACTS and REQUEST_INSTALL_PACKAGES permissions; unified GitHub release viewing across flavors in preparation for v4.2.6 merger.
    - App Profiles & Typing Compatibility: Added per-app Allow Symbol Composing (fixing Tasker underscore variables) and Force Non-Incognito toggles; fixed bro
  • Version 4.2.5 (4205) - Added on Sep 21, 2026

    arm64-v8a armeabi-v7a

    This version requires Android 6.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • change your audio settings
      Allows the app to modify global audio settings such as volume and which speaker is used for output.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • read image files from shared storage
      Allows the app to read image files from your shared storage.
    • android.permission.READ_USER_DICTIONARY
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • android.permission.WRITE_USER_DICTIONARY
    • com.leanbitlab.leantype.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 10 MiB PGP Signature | Build Log