Choose Mem if
You want an assistant that captures what you tell it by voice or text, tracks tasks and projects from your notes, and works on your Mac, Windows PC, iPhone or the web.
Compare
Knowtarium vs Mem
Mem calls itself your AI chief of staff: you save notes, and Mem Agent turns them into tasks, answers and check-ins, which means Mem reads them. Knowtarium is an end-to-end encrypted knowledge base that your own agents work in: we can't read it, and every change they make is signed and can be undone.
The short version
Which one is for you?
They solve different problems. Here's which one fits the way you work.
Choose Knowtarium if
You already use Claude Code, Codex or Cursor, and want a private knowledge base they can work in that nobody else can read, with every change signed, shown and undoable. See how that works as an AI second brain.
Side by side
Feature by feature.
TopicKnowtariumMem
Made forA private knowledge base that you and your own AI agents work inAn AI assistant for your notes: capture, tasks, projects and answers
EncryptionEnd-to-end: notes, titles, file names and links are encrypted on your device, and we can't read them. The AI you connect sees what it readsEncrypted in transit and at rest, not end-to-end, so Mem's AI can work on your notes
AI built inNone: we run no AI models. Your own agents do the work, with the model you chooseMem Agent, Mem Chat and Voice Mode; custom routines on Pro
How agents work with itYour own agents over MCP: sets up Claude Code, Codex, Cursor, OpenCode and Claude Desktop, each limited to one workspace or some folders. claude.ai and ChatGPT laterMem MCP, a hosted server for Claude, ChatGPT, Claude Code, Codex CLI and Gemini CLI that can read, search, create, edit and trash notes
Who changed whatEvery change is signed by whoever made it, you or a named agent, and can be undone in one clickNot built in
Format and lock-inNone: export every workspace as plain OKF markdown files in one zip, readable by any editor or agentNotes in Mem's cloud; export your notes as Markdown files
Usage limitsNone on AI use, since we run none; your agents' own plans applyMonthly allowances per plan: 25 messages to Mem and 25 new notes on the free plan
PlatformsA web app in your browser; no desktop or phone app yetMac, Windows, iOS and the web
PriceFree with 500 MB and one workspace; Starter $5.99 a month for 2 GB, Pro $11.99 a month for 10 GB; two months free billed yearlyFree plan; paid plans from $9 to $199 a month
Facts about Mem checked on September 26, 2026 against get.mem.ai and docs.mem.ai, and its encryption on October 5, 2026. Mem is a trademark of its owner. OKF is published by Google Cloud. Knowtarium isn't affiliated with either. Spot something out of date? Email support@knowtarium.com.