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

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 + 10

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.

  • lost · 3 weeks ago

    "I already solved this. Where was it?"

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

  • which app · ChatGPT? Claude?

    "Was that answer in ChatGPT or Claude?"

    One search spans every connected assistant at once.

  • buried · scroll, scroll, scroll

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

    Your prompts stay indexed and reusable, never buried.

  • again · same question, new thread

    "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.

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

What you actually get

Everything below is in the extension today. It's free — Vault is the one optional extra.

  • Search

    Search by meaning

    Type what you remember — "that masonry fix" — not exact keywords. Semantic search finds the conversation you mean.

  • Handoff

    Continue in another AI

    Right-click any saved chat to carry on in a different assistant — the full conversation comes with you, and a local summariser can condense a 40-turn thread first.

  • Memory

    Save any line as a memory

    Highlight text in any chat to save it, then inject it as context the next time you prompt — in any assistant.

  • Import

    One-click history import

    Backfill your existing history from nine assistants — or load your ChatGPT data export when your history is huge.

  • Capture

    Auto-capture as you chat

    New conversations index themselves in the background — prompts, answers, even images. Nothing to file.

  • Archive

    Still there when the original is gone

    Every chat is saved to your device. If the platform deletes it — or you're offline — your saved copy opens instantly, intact.

  • Results

    Exact-message results

    Filter by assistant or date, jump straight to the message you need, copy it in one click, get back to work.

  • Access

    Search from anywhere

    The ⌘/Ctrl+⇧+9 overlay on any page, the toolbar popup, and a search bar inside every supported chat.

  • Starred

    Star the chats you revisit

    Star results straight from search and filter to them in one click. Starred chats are protected — never cleaned up to make room.

  • Insights

    See which AIs you actually use

    Which assistants you lean on most, plus a "Your year in AI" snapshot — computed locally, like everything else.

  • MCP · Free

    Your desktop AI can search it too

    Claude Desktop, Claude Code, Cursor, Codex, ZCode and more answer from this same history over a local MCP connection — citing the source chats.

  • Export

    Own your history

    Back up or export the whole index in a portable format, copy any single message, or wipe everything. It stays yours.

  • Vault · Paid add-on

    Optional: encrypted sync across your devices

    Vault adds end-to-end encrypted backup and sync, its phone-and-desktop web app, and Ask Vault. It's the only paid part — search never needs it.

     Explore Vault →
Add to Chrome — Free

Free to use. Install in seconds.

06 — platforms

Works across the AI tools you actually use

Search web AI conversations and local coding-agent sessions from one place.

Web AI chats

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

Local coding agents

indexed on this machine
  • $ claude code
  • $ codex
  • $ zcode

Claude Code, Codex, and ZCode sessions are indexed locally on this machine, then appear in the same search as your web AI conversations. Only your prompts and the assistant's replies are indexed. See how local sessions work → ZCode guide →

07 — privacy

Local-first. Private by design.

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

This device

Your search index lives in your browser. Free search uploads nothing — ever.

0 bytes leave
Optional Vault sync

Encrypted on your device before upload. The server stores ciphertext we cannot read.

end-to-end encrypted
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 encrypted archive across your devices.

Local-first keeps your history on this device. Optional Vault syncs that history across your supported desktops and keeps an end-to-end encrypted backup. In the installable Vault web app beta, you can search and read the synced archive on phone or desktop. Ask Vault is a built-in beta feature for asking questions across that history and tracing the answer back to its source conversations. 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
15 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. Vault is a separate, optional paid service. If you choose it, 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, Z.ai, and Meta 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, Google AI Mode, Perplexity, Microsoft Copilot, Meta AI, DeepSeek, Grok, Mistral, Kimi, Qwen, Google AI Studio, Character.AI, and Z.ai. You can also index local Claude Code, Codex, and ZCode sessions into the same search.

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?

Local capture, imports, search, and the desktop MCP connection are free. Vault is an optional paid service for encrypted sync, backup, restore, and its web app beta.

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.