Memex — Privacy Policy

Memex is a browser extension that helps you find and organise your own AI chat conversations. This policy explains exactly what data leaves your device and what does not.

What stays on your device

The full text of your conversations, message snippets and AI-generated summaries are indexed and stored locally in your browser (IndexedDB). On the free plan this local index is never uploaded to our servers — only your account email and the sync metadata listed below ever leave your device. On paid plans, the AI search index sends a title and short preview of each conversation to our server; if you additionally turn on Deep indexing (Settings → Indexing, off by default), the conversation body is included too (see AI features below). Removing the extension, or using “Clear all data” in settings, deletes this local index.

What we store on our servers (only if you create an account)

• Account: your email address and password, managed by our authentication provider (passwords are hashed; we never see them).
• Billing: your plan and a billing-provider customer reference and subscription status. Card details are handled entirely by our payment provider — we never receive or store them.
• Sync (metadata only): to sync across your devices we store conversation metadata — titles, URLs, IDs, keywords, topics, save dates — and the organisation you create: tags, groups, favourites, notes, saved prompts, prompt chains, the hidden list, and short excerpts of messages you explicitly pin. This sync record does not contain the full text of your conversations.
• AI search index (paid plans only): if you use AI search, we store a vector embedding of each conversation together with a short excerpt (up to ~2,500 characters) so we can answer your questions. The excerpt is drawn from the title and preview by default, or from the conversation body if you enable Deep indexing. This is described under AI features below.

AI features

The AI features are available on paid plans. The relevant conversation text or titles are routed through our server to a third-party AI provider to generate each result:

• Summarisation — Anthropic (Claude). The conversation text is sent at the moment you request a summary.
• Workflow sorting — Google AI (Gemini) or Anthropic (Claude), depending on the active routing. Sent when you run a sort.
• Ask Memex (Q&A) — to make your library searchable, after indexing we send each conversation's title and a short preview (~300 characters) to our server — or, if Deep indexing is enabled, up to ~6,000 characters of the body — and generate a vector embedding via OpenAI; we store the vector with a short excerpt (up to ~2,500 characters) so we can answer later questions. When you ask a question, the matching excerpts are sent to Anthropic (Claude) to write the answer.

Data sent to these providers via their APIs is not used to train their models. We do not sell your data or use it for advertising.

Third-party processors

• Supabase — authentication and database storage
• Anthropic — AI processing for summarise / sort / Q&A features
• OpenAI — vector embeddings for Ask Memex search
• Google AI (Gemini) — AI processing for the sort feature
• Stripe — subscription payments
• Resend — transactional email (confirmation, password reset)
• Railway — server hosting

Quotas, plans and free use

Memex offers a free plan with lifetime trial caps on the AI features (5 summaries, 5 Ask Memex questions, 1 smart re-sort) and capped local organisation (20 indexed conversations, 5 tags / favourites / active sessions, 3 saved prompts, 1 prompt chain). Paid tiers (Starter / Pro / Power) lift the limits and reset the AI quotas on a rolling 24-hour window. The exact numbers for each plan live in the extension's help page (Settings → Help / “?”) and are subject to change with at least 14 days' notice when the change reduces a plan you are subscribed to.

Your rights

You can export all of your data from the extension at any time (Settings → Export), and import it back. You can permanently delete your account and all associated server-side data from Settings → Delete account (this requires your password and cannot be undone). Local data is removed by uninstalling the extension or using “Clear all data”. Resetting individual organisation (single tags, hidden conversations, single favourites) is done from the dashboard itself — there is no bulk “reset tag data” or “auto-clear session” control any more (both were removed on 27 May 2026 to simplify the surface).

Contact

Questions or data requests: privacy@getmemex.app