What is Memdex?

Memdex is a Chrome extension that transforms every AI conversation into reusable memory. It automatically captures your chats across ChatGPT, Claude, and Gemini, stores them encrypted on your laptop using IndexedDB (never uploaded to any server), and underlines reusable context in your next prompt—just like Grammarly underlines typos. With one click, you can inject that context when you need it, making your AI interactions smarter and more efficient.

Who it's for

• Frequent AI users who switch between ChatGPT, Claude, and Gemini and want to carry context seamlessly across platforms.
• Knowledge workers who rely on AI for research, writing, or coding and need to recall past conversations without manual note-taking.
• Privacy-conscious professionals who want AI memory without their data leaving their device—Memdex stores everything encrypted locally.

Key features

Auto-capture across AI platforms

Memdex works silently in the background, recording your conversations on ChatGPT, Claude, and Gemini. No manual saving or copy-pasting required—every chat is automatically indexed and stored for future use.

Local encrypted storage

All captured memories stay on your laptop using IndexedDB. Your data is encrypted and never uploaded to any server, giving you complete control over your AI conversation history.

Context-aware underlining

When you start typing a new prompt, Memdex underlines relevant past context from your stored conversations. This works like Grammarly's typo detection but for AI memory—highlighting what you might want to reuse.

One-click injection

Click on any underlined context to instantly inject it into your current prompt. No need to search through chat histories or retype past insights—Memdex brings them forward with a single click.

What stands out

"Memdex turns your AI conversations into a searchable, reusable memory bank that never leaves your laptop."

This approach solves two major problems: the friction of manually managing AI context and the privacy concerns of cloud-based memory tools. By storing everything locally and making it as easy to use as Grammarly, Memdex offers a practical, privacy-first solution that works across the three most popular AI platforms. The free tier covers your 10 most recent chats, making it easy to try without commitment.

Worth checking out if…

You regularly use ChatGPT, Claude, or Gemini and find yourself repeating context or searching through old conversations. Memdex is especially valuable if you value privacy and want your AI memory to stay on your device, or if you're looking for a Grammarly-like experience for your AI prompts. The free tier makes it risk-free to test, and the Pro upgrade unlocks unlimited memory for power users.