JustOnce is a memory that belongs to you, not to one AI product. You tell any connected assistant something once — your insurer, your kid's allergy, the decision your team made in March — and JustOnce stores it. Every other assistant you connect (Claude, ChatGPT, Cursor, VS Code, Windsurf, Gemini, or any MCP client) can recall it later, in a different app, without being told again.
What makes it different from built-in memory
Portable across vendors. ChatGPT, Claude and Gemini each keep memory inside their own app. JustOnce serves the same memory to all of them over the open Model Context Protocol (MCP).
Inspectable. Every fact JustOnce holds is visible in the web app at app.justonce.ai, where you can correct, archive or delete it.
Keeps history. Corrections supersede rather than overwrite, so you can ask what was true as of any date. See Correct a memory, and why the old value is kept.
Verbatim-first. What you said is stored as you said it, not only as a model's paraphrase.
Encrypted at rest, never used for training. See How your data is encrypted and where it lives.
How memory gets in
Through a connected assistant ("remember that…"), by typing or pasting in the web app, by uploading a document, or by forwarding an email to your private vault address (paid plans, with your own AI key).
How memory comes out
Your assistants search and recall it as they need it. In the web app you get your memories, search, a detail view for every memory, a calendar of the dates in them, shared spaces and an activity ledger. Recall and search are free on every plan — only what you add is metered.
Ready? Start with Create your account and sign in (you can also sign up straight from your AI app), then The five-minute setup checklist.