Multiple profiles and personas
Create named profiles such as Copywriter, Student, or Fitness Coach, then switch between them when different tasks call for different rules or tone.
ContxtAI
ContxtAI is an open-source browser extension that stores reusable AI context locally and injects it into supported chat tools like ChatGPT, Claude, and Gemini. It is aimed at people who want to keep prompts, rules, and preferences portable without repeatedly copy-pasting them.
Portable AI memory for browser-based chat tools
ContxtAI is an open-source browser extension that acts as a portable memory layer for AI chats. It lets users store reusable context profiles locally and inject them into supported AI tools so they do not have to retype background instructions, rules, or preferences in every new conversation.
The product is positioned around local-first privacy and cross-platform use. The site says it works with ChatGPT, Claude, and Gemini, and the technical blog explains that it handles modern web editors by interacting with their DOM and input events so context can be inserted reliably into the chat box.
Powerful, privacy-first features
One-click context injection
Select a profile and inject its rules directly into the active AI chat box in ChatGPT, Claude, or Gemini with one click.
Auto-distillation of context
Save useful conversation patterns from a successful chat and reuse them later without rebuilding the prompt from scratch.
Local privacy scrubbing
Detect sensitive information such as passwords before text is sent to the AI, keeping that data on the user’s device.
Context budget tracking
Show a visual token budget and warning cues so users can see how much context is being sent and when long chats may start losing the original rules.
Cross-platform portability
Work as a bridge across supported AI apps so the same portable context can move between platforms instead of staying locked to one service.
Built for people who use AI repeatedly
Writers
Keep brand voice, audience notes, and style rules attached to a writing profile so each new draft starts with the same guidance.
Students
Store assignment rules, course notes, and learning preferences once, then inject them into new study chats without rebuilding the prompt.
Developers
Carry coding standards, tech stack details, and project architecture into coding chats so the AI has the same project context every time.
Marketers
Maintain campaign briefs, target audience details, and brand language for content generation and review work across multiple AI conversations.
Pros and Cons
Pros
- Stores profiles and rules locally in the browser rather than on a remote server.
- Supports reusable profiles so different work modes can keep separate instructions.
- Injects context directly into supported AI chat boxes instead of relying on manual copy and paste.
- Includes privacy-focused safeguards such as scrubbing sensitive data before sending text to an AI.
- Provides a visual context budget so users can manage how much information is being sent at once.
Cons
- Currently built for Chromium-based browsers; Firefox support is not available yet.
- The supported AI apps listed on the site are limited to ChatGPT, Claude, and Gemini, with additional support depending on open-source contributions.
FAQ
Is my data really stored locally?
ContxtAI stores profiles, rules, and context locally in Chrome’s built-in storage. The site says it does not use servers, accounts, or tracking, and that personal data stays on the device.
Is ContxtAI free to use?
The product is described as 100% free and open source, with no premium tiers, usage limits, or hidden costs mentioned on the site.
Which AI tools does it support?
ContxtAI currently supports ChatGPT, Claude, and Gemini. The site also says it is open source, so contributors can add support for additional tools.
Does it work in Firefox?
The site says ContxtAI is built for Chromium-based browsers, including Chrome, Brave, Edge, and Arc. Firefox support is listed as being on the roadmap.
Quick Facts
- Category
- AI Chat / Browser Extension
- Platform
- Chromium-based browsers
- Supported AI tools
- ChatGPT, Claude, Gemini
- Pricing
- Free and open source
- Storage model
- Local-first browser storage
- Source domain
- contxtai.vinaykolupula.workers.dev
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