What is Sagai?
Sagai is a Chrome extension writing assistant designed to help users produce clearer, error-free text on webpages. It acts like an in-browser proofreader, providing real-time assistance for writing decisions and eliminating repeated hesitation over grammar or word choice. To use it, simply type or highlight text, click the extension button, and receive optimized text suggestions—ready to replace the original text after manual adjustments.
This tool requires users to provide their own OpenAI API keys, which are stored exclusively in the local browser; developers have no access to them.
Key features
It supports highlighting selected text on any webpage and obtaining, with one click, rewritten suggestions that are grammatically correct and more clearly expressed.
All OpenAI API calls rely on the user’s locally configured keys, which are stored strictly within the browser and are neither accessed nor transmitted by the plugin’s server.
Use cases and audience
Users who need to quickly improve the quality of their English writing on webpages—including students, professionals, and non-native English speakers—
- Polish grammar and wording in real time when composing web forms, emails, or social media posts
- One-click rewrite and polish existing text to enhance clarity of expression
- Assist non-native speakers in identifying common errors in English writing
The English text entered or highlighted by the user on the webpage
Suggested English text after grammar correction and semantic optimization, supporting both copying and manual editing.
Frequently asked questions
Does Sagai require an OpenAI API key?
Yes, this extension requires users to provide their own OpenAI API key; the key is stored only locally in the browser and is inaccessible to the developer.
Will my data be sold or used for other purposes?
No. The developer states: Your data has not been sold to third parties, nor used for purposes unrelated to the core functionality of this tool, nor used for credit assessment or lending purposes.
How to use
- 01
Type normally on any webpage
- 02
Select the text you wish to optimize
- 03
Click the Sagai extension icon to receive rewriting suggestions
- 04
Copy and manually adjust the suggested content before replacing the original text
Official website & sources
Updated on 2026-10-31
