Powered directly by Gemini API

Write better, instantly, on any page.

A premium, minimal writing assistant extension styled with clean zinc aesthetics. Highlight text, choose an action, and refine your sentences without leaving your browser tabs.

Install Extension Explore Features

100% Privacy First

Custom Prompts

No Server Fees

sandbox.textbetter.dev

Click a sample text below to see how it works!

Designed for modern writing workflows

An intentionally designed helper that fits in naturally with your browser. No distracting AI glows or bloated tabs, just clean inputs and helpful summaries.

Direct API Access

No subscription or monthly fees. Hook up your own Google Gemini API key. All connections are directly made from your browser to Google servers.

Prompt Customization

Tweak templates for each of the pre-set commands. Customize instructions for professional tones, emojis, translations, or shortening text.

Model Choices

Pick the right brain for your task. Choose between Gemini 3.5 Flash for high performance reasoning, or Gemini 3.1 Flash-Lite for ultra-fast corrections.

Zinc Theming

Built using design tokens matching Shadcn UI's zinc themes. Perfect readability and accessible contrast in both light and dark systems.

Analytics Dashboard

Keep tabs on your API usage directly inside the extension popup. See total requests made, tokens used, and your top rewriting action.

Inline Substitution

No copy-paste needed. When writing in comment boxes, text areas, or forms, insert suggestions directly back into the inputs instantly.

Get Started in 3 Steps

How to install the extension and connect it to Google Gemini.

Clone & Pack the Extension

Since TextBetter is in developer mode, you can download the code and load it unpacked:

git clone https://github.com/klysman08/TextBetter.git

Navigate to chrome://extensions in your Chrome browser, enable Developer mode in the top right, and click Load unpacked. Select this project directory.

Get your Gemini API Key

Head to Google AI Studio, log in with your Google account, and generate a new API key. It takes less than a minute and has a generous free tier.

Configure and Select Text

Click the extension icon, paste your API key, and click Save Settings. Now, simply highlight any text on a web page, and double-click or select to see the TextBetter action bar.

Frequently Asked Questions

Got questions about privacy, billing, or security? We've got answers.

Is my API Key secure?

Yes, absolutely. TextBetter is built with an offline-first privacy model. Your API key is stored securely in your browser's local sandbox storage using chrome.storage.local. No server receives this key, and all API queries go directly from your local browser client to Google's official Gemini API servers.

Does this cost money?

The extension itself is 100% free and open-source. For the AI processing, Google AI Studio offers a free tier for Gemini models (like Gemini 3.1 Flash-Lite) which handles hundreds of queries per day at no cost. You only pay if you exceed those limits and set up billing, but for standard user workloads, it is completely free.

Which Gemini model should I choose?

We recommend Gemini 3.1 Flash-Lite for simple, rapid writing corrections, as it provides near-instant responses with low token consumption. If you need highly complex rewrites, tone adjustments, or advanced reasoning, switch to Gemini 3.5 Flash in the Settings panel.

Can I add custom options to the floating menu?

You can fully customize the instructions behind each menu option (e.g. telling the professional action to write in a specific email style). Currently, the option actions themselves are pre-set, but we plan to allow user-defined actions in a future update.