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Simul

Read the translation. Use the real page.

Simul puts a live, read-only translated copy beside the page you are using. The original stays where it is, ready for you to click, type, and submit.

Download the latest beta → How to install
  • Version 0.5.2 beta
  • Chrome 138+ on desktop or laptop
  • No account or API key
01What it does

A translated copy that follows along

Open a web page, choose a language, and translate. Simul shows the translated mirror in Chrome's side panel or in a separate window while the original page remains usable.

Illustration. Read the copy on the right; type and submit on the real page on the left.
Original page
Stays live and usable.
Translated mirror
Read-only, so it cannot submit a form or click something by mistake.
Text in images
Optional OCR reads it locally after you allow image access.
Display
Use the side panel or a separate window.
02Install

Download once, then load the folder

Simul is currently distributed as an unpacked extension from GitHub. It is not listed in the Chrome Web Store.

  1. Download and unzip the simul-<version>-chrome-unpacked.zip file from the latest GitHub release. Do not use the source-code zip.
  2. Open chrome://extensions (edge://extensions in Edge), then turn on Developer mode.
  3. Select Load unpacked and choose the unzipped chrome-unpacked folder.
Download version 0.5.2 beta →
03Requirements

A recent browser on a computer

Google Chrome
Version 138 or newer on a desktop or laptop. This is the browser Simul is tested in.
Microsoft Edge
Version 148 or newer. It works, but receives less testing than Chrome.
Disk space
About 35 MB for the extension. The browser may download a language pack the first time you translate into a new language.
Unsupported browsers
Firefox, Safari, phones, and tablets do not provide the Translator API Simul needs. Other Chromium browsers work only if they include that API.
04On-device translation

The page text stays on your computer

Simul uses the browser's built-in Translator API. Chrome and Edge run its language models on your device, so page text is not sent to a Simul server. OCR for text in images also runs locally with the engine packaged in the extension.

View the source on GitHub → Send feedback →

Simul is open source under the MIT license. Packaged third-party components retain their own licenses.