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metasequoiaime/msime-windows

An open-source, free Windows input method built on TSF, supporting Chinese pinyin, shuangpin, Wubi, and Japanese romaji input.

Open-source alternative to:Microsoft Pinyin IMESogou Pinyin

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What is it?

Metasequoia IME (水杉输入法) is a free, open-source Chinese input method for Windows 10 and Windows 11. It is implemented as a pure TSF (Text Services Framework) text service, with a separate server process handling the input engine, candidate windows, settings, and dictionary management.

On the Chinese side it offers full pinyin, a range of shuangpin schemes (Xiaohe, Ziranma, Microsoft, Sogou and others), and 86 Wubi. It also supports auxiliary-code filtering for pinyin, mixed input of English, emoji, symbols and date/time into candidates, and Japanese romaji input with hiragana and katakana candidates.

Optional features include Google cloud suggestions, AI-based association via OpenAI-compatible APIs, inline translation in candidate windows, voice input, handwriting recognition, an on-screen keyboard, and several skins with dark and light modes. The repository contains the full Windows source, with the engine, UI framework and installer in one place.

Key features

  • 01Full pinyin and multiple shuangpin layouts, plus 86 Wubi input.
  • 02Auxiliary-code filtering for pinyin with several scheme options.
  • 03Mixed candidates for English, emoji, symbols, and date/time.
  • 04Japanese romaji input with hiragana and katakana candidates.
  • 05Optional cloud and AI-based word suggestions.
  • 06Voice input, handwriting recognition, and an on-screen keyboard.

Use cases

  • Chinese typing on Windows with a free, open-source IME.
  • Using shuangpin or Wubi layouts with auxiliary-code refinement.
  • Switching between Chinese and Japanese input without changing tools.
  • Customizing dictionaries, quick phrases, and candidate behavior.

Quick start

  1. 1

    Download the installer from Releases or the official download page

  2. 2

    Install the Visual C++ 2015–2022 Redistributable (x64) if the IME fails to switch or crashes

  3. 3

    Press Win + Space to switch to MSIME

Things to know

  • Windows 10 and Windows 11 only.
  • Cloud candidates, AI association, translation and voice input need network access and, for some providers, API keys.
  • Some features such as voice input and AI association depend on external paid or third-party services.

Topics

#input-method#windows#tsf#chinese#pinyin#wubi#japanese#shuangpin#ime#metasequoia

FAQ

What is msime-windows?
An open-source, free Windows input method built on TSF, supporting Chinese pinyin, shuangpin, Wubi, and Japanese romaji input. Metasequoia IME (水杉输入法) is a free, open-source Chinese input method for Windows 10 and Windows 11. It is implemented as a pure TSF (Text Services Framework) text service, with a separate server process handling the input engine, candidate windows, settings, and dictionary management.
Is msime-windows free to use? What license does it have?
msime-windows is open source under the GPL-3.0 license. Check the license terms before using it in commercial products.
Is msime-windows still maintained?
Actively maintained. The last commit to msime-windows was on Oct 19, 2026.
What can I use msime-windows for?
Chinese typing on Windows with a free, open-source IME. Using shuangpin or Wubi layouts with auxiliary-code refinement. Switching between Chinese and Japanese input without changing tools. Customizing dictionaries, quick phrases, and candidate behavior.
How do I install msime-windows?
Download the installer from Releases or the official download page Install the Visual C++ 2015–2022 Redistributable (x64) if the IME fails to switch or crashes Press Win + Space to switch to MSIME
Where can I get msime-windows?
The source code and installation instructions are on GitHub: https://github.com/metasequoiaime/msime-windows

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