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LLMnesia Review

LLMnesia is a free Chrome extension designed for local, full-text search of AI chat history across multiple platforms, storing all conversation data locally on the user's device.

shipped Sep 11, 2026writingfree
Domain rating16
writingresearch

Why it matters

1Indexes conversations from over a dozen AI platforms including ChatGPT, Claude, and Gemini.
2Stores all conversation data locally on the user's device, ensuring privacy.
3Features semantic search and a 'Memory' function for highlighting and saving text.
4Supports integration with desktop AI tools like Claude Desktop and Cursor via MCP.

Specs

API Available

Yes, public API

overview

What is LLMnesia?

LLMnesia is an AI chat history management tool developed by LLMnesia that enables users to search and retrieve past conversations across various AI platforms. It functions as a local-first browser extension that indexes users' AI chat history, making it searchable and accessible in one unified interface. The tool automatically captures and indexes conversations from platforms such as ChatGPT, Claude, Gemini, Perplexity, and Copilot, storing all data locally on the user's device to ensure privacy. Its primary function is to provide a unified search experience, allowing users to efficiently retrieve past interactions and prevent the loss of valuable information.

features

Key Features of LLMnesia

LLMnesia provides a comprehensive set of features designed to enhance the management and retrieval of AI chat histories. The extension, updated to version 0.3.0 as of August 27, 2026, focuses on local data storage and efficient search capabilities across a wide array of AI platforms.

  • Local, full-text search of AI chat history across platforms like ChatGPT, Claude, Gemini, Perplexity, and Copilot.
  • Automatic capture and indexing of conversations from over a dozen AI platforms.
  • Unified search experience accessible via Cmd/Ctrl + Shift + 9 shortcut, with typical search times under 50ms.
  • Local storage of all conversation data on the user's device, ensuring privacy with 0 Bytes uploaded by local search.
  • Memory Feature: Highlight and save text from any chat as a 'memory' with labels, retaining origin links.
  • Semantic Search: Find chats by meaning rather than requiring exact keywords.
  • Desktop AI Integration (MCP): Connects with desktop AI tools such as Claude Desktop, Claude Code, Cursor, and Codex.
  • Export and backup conversation history, allowing users to own their knowledge.
  • Optional Vault subscription for end-to-end encrypted sync and backup across devices.
  • Prompts stay indexed and reusable, preventing repetition in AI interactions.

use cases

Who Should Use LLMnesia?

LLMnesia is designed for individuals and professionals who frequently interact with multiple AI platforms and require an efficient method to manage, search, and retrieve their past conversations. Its local-first design and comprehensive indexing capabilities make it suitable for various use cases where data privacy and continuity are critical.

  • Students: To find explanations, essay drafts, problem walkthroughs, and study sessions, ensuring coursework builds on itself.
  • Researchers: To maintain continuity across long AI-assisted projects by making hypothesis drafts, source synthesis, and methodology discussions searchable.
  • Developers: To enable quick retrieval of AI-generated debugging solutions, architecture decisions, and migration fixes, preventing the need to re-derive solutions.
  • Founders: To search prior AI work related to strategy, product, hiring, and go-to-market prompts, avoiding the repetition of decisions.
  • Writers: To locate best AI drafts, tone experiments, structural alternatives, and refined prompts from unsearchable chat histories.
  • Consultants: To facilitate the reuse of AI-generated analysis, frameworks, and communication templates across different client engagements, with all data remaining local to the device.

how to use

How to Use LLMnesia

LLMnesia operates as a browser extension for Chrome and Edge, automatically indexing AI chat conversations as they occur. Users can initiate searches directly from their browser to retrieve past interactions.

  • 1Install the LLMnesia extension from the Chrome Web Store or Edge Add-ons store.
  • 2Engage in conversations on supported AI platforms such as ChatGPT, Claude, Gemini, or Perplexity; LLMnesia will automatically capture and index these interactions.
  • 3Use the keyboard shortcut Cmd/Ctrl + Shift + 9 to open the LLMnesia search interface.
  • 4Type keywords or phrases into the search bar to find specific prompts, answers, or discussions from your indexed history.
  • 5Click on a search result to navigate directly to the exact message within the original conversation on its respective AI platform.
  • 6Optionally, highlight text within any chat and save it as a 'memory' with a label for future reference.

pricing

LLMnesia Pricing & Plans

LLMnesia offers a two-tiered pricing structure, providing a robust free extension for local search and an optional paid subscription for enhanced features like encrypted synchronization.

  • Free Extension: Free. Includes local search index stored on the device, no account or cloud required, and compatibility with Chrome & Edge browsers. All indexing and search operations run locally.
  • Vault Subscription: £8 a month or £88 a year. This plan extends functionality by enabling end-to-end encrypted sync across supported desktops and browsers, providing a private backup, and offering more history for local MCP search. LLMnesia does not hold the encryption key for Vault data.

Pros

  • +Ensures data privacy by storing all conversation history locally on the user's device.
  • +Provides a unified search experience across over a dozen AI platforms, including ChatGPT, Claude, and Gemini.
  • +Features semantic search and a 'Memory' function for efficient retrieval and organization of specific information.
  • +Integrates with desktop AI tools (e.g., Claude Desktop, Cursor) via MCP for broader utility.
  • +Offers a free core extension with no account required, making it accessible for individual users.
  • +Allows for export and backup of conversation history, giving users ownership of their data.

Cons

  • −The free version's search index is limited to a single browser profile and device.
  • −The 'Vault' feature for cross-device sync and encrypted backup requires a paid subscription (£8/month).
  • −As a browser extension, its functionality is tied to the browser environment (Chrome, Edge).
  • −Specific detailed user reviews or testimonials are not widely available in public search snippets.
  • −Does not offer direct export to external note-taking systems like Obsidian or Notion in the free tier, unlike some competitors.

Policies

Pricing Page

View Pricing→

Similar Tools

LLMnesia vs Competitors

LLMnesia distinguishes itself in the market of AI chat history management tools primarily through its 'local-first' and 'private by design' architecture. This approach ensures that conversation content remains on the user's device, addressing significant privacy concerns. Its ability to integrate with desktop AI tools via MCP also broadens its utility beyond browser-only solutions.

1
Personal AI Memory↗

It's a local-first, open-source extension that passively captures conversations and stores them as private, locally-indexed semantic memories, with a "Recall" button to inject context into new chats.

Personal AI Memory is open-source and emphasizes semantic memory and context injection, offering a more minimalist approach compared to LLMnesia's broader multi-platform search focus.

2
ChatTrack↗

It works as an instant sidebar inside ChatGPT, Gemini, and Claude, providing in-page access to history, bookmarking, and PDF export.

ChatTrack integrates directly into the AI chat interface as a sidebar, offering in-page access and PDF export, whereas LLMnesia provides a unified search interface accessible from the browser toolbar.

3
AI Chat Conversation History Search↗

It allows searching AI chat history directly within supported AI chat websites, making it feel like a local knowledge base with direct links back to original chats.

Both offer local full-text search across multiple platforms and direct links to original conversations. This tool focuses on in-page search integration, similar to LLMnesia's core search functionality.

4
ChatEngram↗

It auto-captures chats across multiple AI platforms, stores them locally, offers global search, and provides one-click Markdown export to tools like Obsidian, Notion, and Google Drive.

ChatEngram offers robust export capabilities to external note-taking systems like Obsidian and Notion, which is a key differentiator from LLMnesia's primary focus on in-browser search and retrieval.

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