A second brain that’s already thinking before you are.
Most thinking tools ask too much. They want you to organize, tag, link, file, and remember to come back. They turn what should be a tool into a second job.
tentus started from a quieter belief: the work of organizing your own thinking shouldn’t fall back on you. The software should do it. Not by guessing wildly, and not by burying you in suggestions — but by paying close attention to what you’ve already captured and surfacing it at the right moment.
Lumi reads across your sources — docs, meetings, calendar, messages — and prepares context before you ask. When you sit down to write a reply, prep for a call, or revisit a decision, the relevant pieces are already there.
In the productMeeting Prep assembles the brief before each calendar event, and the Daily Digest surfaces what changed — both on from the first day, no setup. see it →
Lumi only knows what you’ve told it. That’s a feature, not a limit. A thinking tool that hallucinates is worse than no thinking tool at all. tentus stays inside your workspace, cites its sources, and admits when it doesn’t know.
In the productInspect the sources behind an answer and check them before acting. Missing evidence can leave a question unanswered; a citation does not guarantee a correct interpretation. Web research is a separate workflow. see it →
What we’re not building.
We’re not building a chatbot. We’re not building a replacement for thinking. We’re not building another note app with a sidebar of AI buttons.
In the productThere is no chat box waiting for a prompt. Agents fire on triggers you already use — a tag, a Monday morning, a labeled email — and write into your notes, tasks, and inbox. see it →
We’re building a quiet, fast notebook with a serious respect for the reader’s attention. The chrome disappears; the content is the work. The keyboard is the interface. The accent is terracotta and the page is warm.
In the productPreview the document templates in the gallery. Using a template requires sign-in; review the structure and adapt it to the work in front of you. see it →
Made by a small studio.
tentus is made by a small, opinionated studio, for people who don’t want their tools to be louder than their work. It holds the thinking. What you do with it is yours.
In the product“Yours” is enforceable: everything exports on every plan, every provider that touches your data is listed on one page, and deletion is a real 30-day guarantee, not a policy sentence. see it →
Capture without friction. Retrieve without searching. Your ideas find each other. Nothing falls through.