Every smartphone user relies heavily on an Android keyboard every single day. While default options like Gboard or Samsung Keyboard are popular, many users worry about data privacy, annoying autocorrect quirks, and a lack of custom tools. If you want a keyboard that is private, highly customizable, and equipped with smart features like AI text tools and offline voice typing, LeanType is one of the best choices available.
In this blog post, you will learn everything you need to know about LeanType. We will walk through what LeanType is, its top features, system requirements, download options, step-by-step installation instructions, usage guide, credit to its creators, troubleshooting solutions, frequently asked questions, and more.
Table of Contents
What is LeanType?
LeanType is a free, open-source Android keyboard application developed by LeanBitLab. It is designed for users who want complete control over their typing experience, privacy, and productivity.
Technically, LeanType is an enhanced fork of HeliBoard, which itself was built on top of OpenBoard and the Android Open Source Project (AOSP) LatinIME foundation. While keeping the lightweight and fast performance of those projects, LeanType adds modern tools such as artificial intelligence proofreading, on-device voice recognition, handwriting input, built-in translation, and extensive customization options.
Features of LeanType
LeanType stands out because it combines strict privacy protections with cutting-edge typing tools. Here are the main features you can enjoy:
- Smart Cloud and Self-Hosted AI: Connect to AI providers like Google Gemini, Groq, or OpenAI, or run your own local AI server using Ollama or LM Studio to proofread, fix grammar, and rewrite text.
- Offline Neural AI Proofreading: Run compact AI models directly on your phone using local model files without needing an active internet connection.
- On-Device Whisper Voice Typing: Convert spoken speech to text quickly using offline Whisper models, ensuring your voice recordings never leave your device.
- Handwriting Recognition: Draw characters, words, or symbols directly on a digital canvas on your screen.
- In-Keyboard Translation: Translate text into different languages directly inside your typing window, both online and offline.
- Precision Text Editing and Touchpad Mode: Swipe up on the spacebar to control the cursor like a laptop touchpad, or use dedicated arrow buttons for easy text selection and editing.
- Smart Clipboard Management: Search through your clipboard history, pin important notes, and edit copied text directly from the keyboard toolbar.
- Versatile Text Expander: Create short shortcuts that instantly expand into long sentences, complete with dynamic tags for dates, times, or copied items.
- Flexible Privacy Versions: Choose between standard online builds or pure offline builds that have internet access blocked entirely at the operating system level.
Requirements
Before setting up LeanType on your Android device, check the following hardware and software requirements:
- Operating System: Android 5.0 or higher for the Offline version, and Android 6.0 or higher for the Standard versions.
- Application Storage: Approximately 15 MB of free internal storage for the core keyboard app.
- Additional Storage (Optional): If you plan to use offline tools, you will need extra storage space for companion plugins, language dictionaries (~30 MB), offline voice models (~75 MB), or local AI models (~500 MB or more).
- System Memory: At least 2 GB of RAM for general typing and standard features. A higher-spec processor is recommended if you plan to run local offline AI models.
- Optional Permissions: Microphone permission (if using voice typing) and notification access (if using auto-fill features for one-time verification codes).
Download
LeanType is available in three distinct package versions to match different privacy preferences and device setups:
- Standard Full Version: Recommended for most users. It includes all cloud AI capabilities, plugin support, and an in-app automatic streaming updater.
- Standard FOSS Version: Built for users who prefer pure open-source software managed through open-source app stores.
- Offline Version: Built specifically for strict privacy purists. Internet access is blocked at the system level, meaning it cannot send or receive data over the web.
You can also download separate official companion plugin files if you want to enable offline voice typing, offline handwriting recognition, offline translation, or local AI engines.
Install
Installing LeanType on your Android device is straightforward. Follow these steps:
- Download the specific APK build that matches your needs on your phone.
- Open your device file manager and locate the downloaded file.
- Tap the file to start the installation process. If your browser or file manager asks for permission to install apps from unknown sources, toggle the permission to allow it.
- Follow the on-screen prompts to complete the installation.
- If Google Play Protect or your web browser blocks the manual installation, you can install the app through an open-source app installer or manager on your device.
How to Use
Once installed, getting started with LeanType takes just a few moments. Follow these setup steps:
- Enable the Keyboard: Go to your phone Settings, search for Languages and Input or On-Screen Keyboard, enable LeanType, and set it as your primary input method.
- Set Up AI Tools: Open the LeanType settings menu from your app drawer or keyboard toolbar, navigate to AI Integration, select your preferred AI provider, and enter your API key or self-hosted server address.
- Configure Voice Typing: Open Settings, go to Voice Typing or Plugins, download your preferred speech model file, and tap the microphone icon on the keyboard toolbar whenever you want to dictate text.
- Use Touchpad Mode: While typing in any app, swipe upward on the spacebar key to unlock touchpad mode, allowing you to move the cursor smoothly across characters.
- Customize the Toolbar: Access the toolbar settings to add, remove, or rearrange buttons for clipboard history, translation, custom text shortcuts, and text selection panels.
Credit
LeanType is a collaborative community effort built on top of brilliant open-source software. Credit goes to:
- LeanBitLab: For developing, maintaining, and adding modern features to the LeanType project.
- HeliBoard Team: For creating the clean, lightweight foundation upon which LeanType is built.
- OpenBoard and AOSP LatinIME Projects: For establishing the core open-source Android keyboard codebase.
- Open-Source Libraries: Including whisper.cpp for speech recognition, llama.cpp for local language models, and Google ML Kit for offline digital ink recognition.
Troubleshoot
If you run into issues while using LeanType, try these quick solutions:
- Installation Fails: Ensure your device meets the minimum Android version requirement. If blocked by security prompts, grant your file manager permission to install unknown apps or use an alternative package manager.
- Voice Typing Does Not Respond: Confirm that the LeanType Voice Plugin is installed, microphone permission is granted in your phone settings, and an offline Whisper speech model is selected.
- AI Proofreading Error: For cloud AI, check that your internet connection is active and your API key is correctly entered. For offline AI, verify that the local model file is fully downloaded and properly selected in the advanced settings.
- Swipe Typing Is Not Working: Open keyboard settings, navigate to Gesture Typing, ensure the feature is toggled on, and download the required gesture dictionary library.
FAQs
Yes, LeanType is 100 percent free and open-source software. There are no paid subscriptions, locked features, or hidden costs.
No. LeanType is designed with a strict privacy-first policy. It does not contain telemetry, tracking scripts, or advertisements. The Offline version has internet access disabled entirely.
Yes. You can use the core keyboard, swipe typing, offline voice dictation, handwriting recognition, and offline neural AI tools without any active internet connection.
Unlike standard closed-source keyboards, LeanType does not harvest your personal typing data. It gives you full control over custom AI integrations, plugin management, toolbar layouts, and offline functionality.
Conclusion
LeanType is a powerful, secure, and highly customizable alternative to traditional Android keyboards. Whether you want total data privacy, on-device AI tools, offline voice dictation, or precise text control, LeanType offers a complete package without compromising your security.
Please leave a comment below to share your thoughts, ask questions, or let us know how your experience with LeanType has been!
