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. Chief of Staff writes the morning you'd have written if you'd had an hour first.
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 notes, decisions, and background. No digging.
Connects what you already have
Gmail, Slack, Notion, web clippings — everything lands in one place. Lumi reads across sources, not just inside one tool.
Knowledge that builds itself
Every note, every source, every interaction feeds into a graph that grows richer over time. No manual tagging or folder management.
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, Google Drive, Microsoft 365, Fireflies, and Granola — connected today. Slack coming soon.
Three steps to a brain that works ahead.
Step 1: Connect your sources
Gmail, Google Drive, Slack, Notion, 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 notes, 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