A second brain that's already thinking before you are.
Capture anything without friction. Retrieve anything by meaning, not keyword. Lumi answers from your own material — and brings back what matters before you ask.
Proactive, not reactive.
Most tools wait for you to ask. tentus prepares before you arrive.
Lumi surfaces context
Open the app before a meeting and Lumi has already prepared the relevant docs, decisions, and background. No digging.
Connects what you already have
Slack, Microsoft 365, Zoom, Linear, Readwise, RSS, GitHub, web clips — twenty ways in, one place. Lumi reads across sources, not just inside one tool.
Your ideas find each other
tentus links docs that share people, topics, and decisions — then draws the whole network as an explorable knowledge graph, in 2D or 3D.
Lumi acts, not just answers
Ask in plain language and Lumi schedules the event, files the Linear issue, or researches a topic on the web — always confirming before it acts.
A doc editor that keeps up
Slash-menu blocks for tables with formulas, voice notes, embeds from Drive to Figma to YouTube, calendars, and [[links]] between docs.
Quiet by design
No notifications, no dashboards begging for attention. Open it when you need it. Lumi works in the background until then.
Lumi reads, so you don't have to remember.
Lumi is the reasoning layer inside tentus. It reads every note, document, and conversation you've saved — then surfaces what's relevant the moment you open a meeting, a doc, or a question. No prompts, no commands. Just context, ready.
Ask in plain language. Lumi answers from your material — and cites where it found it.
Connect everything you already use.
Google Calendar and Drive, Microsoft 365, Slack, Fireflies, and Granola — plus more on the way.
Explore all integrations →Three steps to a brain that works ahead.
Step 1: Connect your sources
Google Drive, Slack, Microsoft 365, Zoom, web clippings. Pick the tools you already use.
Step 2: Tentus reads in the background
Lumi processes and indexes everything. No manual import, no folder structure to maintain.
Step 3: Arrive to context
Open tentus before a call and find the relevant docs, recent changes, and open questions ready.
“Lumi synthesized forty hours of research into a three-page strategy doc in one prompt. It's less a notebook and more a chief of staff for my brain.”
Start thinking with a quieter notebook.
Free while you evaluate. Pro at $12/mo when it's paying for itself.
- No credit card
- Export everything anytime
- GDPR-compliant deletion
Early access