LLMnesia
New Use your chat history in Claude, Cursor & Codex

Free for Chrome & Edge — local-first

Stop losing answers in AI chats.

LLMnesia is a free browser extension for Chrome and Edge that searches your AI chat history across ChatGPT, Claude, Gemini, Perplexity, Copilot, DeepSeek, Grok, Mistral, and more. Free search stays on your device; optional Vault adds end-to-end encrypted sync and backup.

Add to Chrome — Free See how it works

Works with ChatGPT Claude Gemini Perplexity Copilot + 8

No account or cloud required. Your free search index stays on this device.

01 — the problem

Sound familiar?

If you use AI every day, this probably sounds familiar.

  • "I already solved this. Where was it?"

    Search once and land on the exact message — not just the chat.

  • "Was that answer in ChatGPT or Claude?"

    One search spans every connected assistant at once.

  • "I wrote the perfect prompt last week. Now it's gone."

    Your prompts stay indexed and reusable, never buried.

  • "Why am I asking the same question again?"

    Re-find the answer instead of re-prompting from scratch.

Your AI chats already contain real work. LLMnesia helps you find it again.

02 — demo

See it in action

Open one search box. Type a few words. Instantly see matching results from ChatGPT, Claude, Gemini and more, then jump straight to the exact message you need.

LLMnesia search overlay showing results from multiple AI platforms in a single browser window

Search across supported AI chat history with Cmd/Ctrl + Shift + 9.

03 — how

How it works

Import your existing ChatGPT, Claude, Gemini, and Perplexity history in a few clicks. After that, LLMnesia indexes supported tools automatically as you work.

1

Install the Chrome or Edge extension

Free, takes a few seconds. No account required.

~10s · once

2

Import your history, then keep chatting

Bring in existing conversations, then let supported tools index automatically as you use them.

automatic · local

3

Press Cmd/Ctrl + Shift + 9 to search

Search your AI chat history locally and jump straight to the exact message.

instant · private

After installing

  1. Open or pin LLMnesia from your browser's extensions menu.
  2. Let it backfill your AI chat history locally.
  3. Press Cmd/Ctrl + Shift + 9 and search across your chats.

Your conversations stay on this device.

04 — audience

Built for people who live in AI chats

If you use multiple AI tools every week, your best work is probably scattered across dozens or hundreds of conversations. LLMnesia turns that messy chat history into something you can actually search and use.

05 — features

How LLMnesia saves you time

You already solved this in AI. LLMnesia helps you find it again.

Stop repeating yourself to AI

Your old answers, prompts, and decisions are already there. LLMnesia helps you find them instead of starting over.

Recover ideas and decisions instantly

Search across ChatGPT, Claude, Gemini and more from one place, with results stored locally for speed and privacy.

Land on the exact message

Jump straight to the message you need, not just the conversation. No endless scrolling.

Search without breaking your flow

Open search with a shortcut, find what you need, and get back to work in seconds.

Own your knowledge

Export and back up your conversation history so your AI work stays yours.

Private by default

Local search needs no account or cloud. Optional Vault encrypts your archive on-device before syncing it.

Add to Chrome — Free

Free to use. Install in seconds.

06 — platforms

Works across the AI tools you actually use

Search conversations across leading AI platforms from one place.

Supported now

  • ChatGPT
  • Claude
  • Gemini
  • Perplexity
  • Microsoft Copilot
  • DeepSeek
  • Grok
  • Mistral
  • Kimi
  • Qwen
  • Google AI Studio
  • Character.AI
  • Z.ai

Are we missing your favourite LLM? Send us a message to let us know!

Plus your local coding-agent sessions

Index Claude Code and Codex chats on your own machine — from their terminal, IDE, and desktop surfaces — into the same search as your web AI conversations, then jump back into the right session. Only your prompts and the assistant's replies are indexed. See how local sessions work →

07 — privacy

Local-first. Private by design.

Your free search index stays on your device. Cloud sync happens only if you choose Vault.

Stored locally

Your searchable index lives in your browser's IndexedDB on each device.

Local by default

Free search uploads nothing. Vault is optional and syncs only end-to-end encrypted data.

You're in control

Export or wipe everything with one click. No account needed.

  • No account for local search
  • No cloud required
  • Vault data encrypted before upload

Designed for people who value privacy.

What each browser permission does
  • Storage - saves your index and settings locally in your browser
  • Tabs - opens the right conversation when you click a search result
  • Active tab - detects which AI platform you're currently visiting
  • Scripting - adds the search bar and index indicator to AI chat pages

No permission is used to read data from any site other than the supported AI platforms.

Now available · Free MCP connection

Let your desktop AI use what you already learned.

Claude Desktop, Cursor, Codex and other desktop AI apps can search the history LLMnesia has already captured, answer from it, and link back to the original chats. The connection and search stay on your computer.

See how MCP works View setup →

Now available · LLMnesia Vault

One memory across every AI tool.

Local-first keeps your history on this device. Optional Vault syncs that history across your supported desktops, keeps an end-to-end encrypted backup, and brings more of your history together for local MCP search. Available for £8 a month or £88 a year.

Explore Vault Subscribe to Vault →

08 — performance

Built to stay out of your way

LLMnesia is designed to be lightweight, fast, and unobtrusive while you work. Search appears when you need it, not as another bloated dashboard competing for attention.

<50ms Typical search
0 Bytes uploaded by local search
13 Platforms indexed
~10s To install

09 — vs second brains

Not another "second brain"

Other tools ask you to save things. LLMnesia is already where you save things.

Other tools
LLMnesia
Capture
Ask you to save things manually
Indexes your AI chats as you use them
Setup
Require tagging and organizing
Zero — opens to your history
Maintenance
Become another system to maintain
Nothing to keep up
Where it lives
Outside the chat tools you use
Where you already work

10 — feedback

Early tester feedback

"I used to waste 10 to 15 minutes trying to remember which AI tool I'd used for something. Now I type a couple of words and it's there."

Product Engineer

"I can't use cloud note tools for some of my work, so local-first mattered. This gives me search without sending anything anywhere."

Security Consultant

"I jump between ChatGPT and Claude constantly. LLMnesia makes that feel like one searchable workspace instead of two separate histories."

Startup Founder

11 — founder note

Why I built this

I use AI constantly across ChatGPT, Claude, Gemini and other tools. I kept having the same frustrating experience: I knew I'd already solved something, but I couldn't remember where. Useful prompts, answers, ideas, and decisions were disappearing into chat history. I built LLMnesia to fix that for myself. Now I'm opening it up to other people who work the same way.

— Keiran

12 — answers

Frequently asked questions

Is my data stored on your servers?

Not when you use free local search: its index stays in your browser. If you choose Vault, LLMnesia stores an end-to-end encrypted backup that we cannot read, so your supported devices can sync.

How does local indexing actually work?

When you visit a supported AI platform, LLMnesia indexes conversation content locally in your browser storage so it is searchable later. It runs automatically in the background.

Will it index my older chat history too?

Yes. You can import your existing history from ChatGPT, Claude, Gemini, Perplexity, DeepSeek, Grok, Character.AI, and Z.ai in a few clicks. For other supported platforms, LLMnesia indexes conversations automatically as you open them.

Which AI platforms are supported today?

Supported now: ChatGPT, Claude, Gemini, Perplexity, Microsoft Copilot, DeepSeek, Grok, Mistral, Kimi, Qwen, Google AI Studio, Character.AI, and Z.ai. You can also index your local Claude Code sessions — from the terminal, the VS Code extension, and the desktop app — into the same search. Codex session support is coming soon.

Will it slow down my browser?

LLMnesia is designed to stay lightweight. Indexing happens incrementally in the background while you work.

Can I delete my indexed data?

Yes. You can clear all indexed data with one click from the extension settings.

Can I export my conversations?

Yes. You can export and back up your conversation history in a portable format that you own.

Does it require an account?

No account is required for local indexing and search.

Is it free?

Yes. LLMnesia is completely free to use.

14 — contact

Report bugs or ask a question

Use this form for bugs, problems, or general queries. Your message goes to the founder inbox and your email address is never shown on the public page.