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Decision intelligence

Finally, somewhere to take the decision you can’t stop thinking about.

A research workspace for the choices you can’t outsource and shouldn’t rush. It won’t tell you what to think. It helps you form a view you can defend.

Request accessSee how it works
A decision, in progressLeaning → Decided

The question

Should we take the smaller round now?

The answer

Take the smaller round, on cleaner terms. Keeps control and buys eighteen months without pricing the next round into a corner.

The counterpoint

Waiting two quarters could double the valuation. The cost is the hires you cannot make until then.

conviction

Sources01Your last three board decks02Comparable 2024-25 terms03Both term sheets
4,600on the waitlist and counting.

The whole idea

Answers tell you what to think. Cestus helps you decide.

Every other tool races to hand you a conclusion. This one slows down on purpose. It maps the possibilities, plays out the scenarios, and anchors every claim in verified research, with the counterpoints left in and your own conviction tracked as it moves. You stay in the chair. Cestus serves your judgment, it never replaces it.

How it works

Four moves. The same four, every time.

  1. 01

    Bring the decision, not a search query.

    State the thing you are actually weighing, in your own words. "Should we take the smaller round." "Is this the city." Cestus works on the choice, not the keyword.

  2. 02

    It reads the record, and shows its receipts.

    Real sources, quoted and linked, with the parts that disagree left in. No confident smoothing over of the places the evidence actually splits.

  3. 03

    It argues the other side, on purpose.

    The strongest honest case against you, written plainly. If your view survives it, you can defend it to anyone. If it does not, better to learn that here.

  4. 04

    It tracks your conviction over time.

    Your confidence is a line, not a verdict. Come back in a month and see how it actually moved, and whether the reason you decided still holds.

One question, five ways to ask it

Most tools answer with one voice. This one has five.

The right lens depends entirely on the kind of decision you are carrying. Pick the lens, and the shape of the answer changes. Or let Cestus pick, and tell you which one it chose and why.

Research
A balanced read of what is actually known.“What does the evidence on this actually say, with the disagreements left in?”
Devil's Advocate
The strongest honest case against you.“I am about to commit. Argue against me, in my own voice, six months from now.”
Verify
One claim, checked against the record.“Did the report actually say what they said it said? Show me the page.”
Compare
Two options against a rubric you can defend.“A or B, on the criteria that actually matter to me, and the one I never wrote down.”
Simulate
The counterfactual you cannot run twice.“If I had taken the other offer last year, where would I likely be now?”

And it remembers

Every decision keeps its own trajectory.

Come back in a month. See how your conviction actually moved, and whether the reason you decided still holds. Nothing here is a verdict. Everything is a line you can revisit.

Your journal3 decisions open
  • Decided· 6 weeks ago · 7 sessions

    Where should we buy our first place?

    The corridor neighborhood. The hesitation was never the place, it was the commitment length.

    conf 0.81
  • Leaning· 2 weeks ago · 3 sessions

    Which city should I try next?

    Three clear the bar. One has the weather I would actually choose.

    conf 0.67
  • Reconsidering· 3 months ago · 12 sessions

    What is the project of my life?

    Two of four still warm. The one with teeth keeps changing shape.

    conf 0.48

The honest part

A tool you can trust is one that tells you what it will not do.

It will not pretend to be certain.
When the evidence splits, you see the split. Confidence is shown as a number that can go down.
It will not invent a source.
Every citation is real and linked, or it is not there. No plausible-sounding references that lead nowhere.
It will not decide for you.
The verbs stay yours. Cestus lays out the case; you are the one who commits, or does not.
It will not sell your decisions.
No ad model, no data broker, no third party we do not name on this page. Your journal is yours.

For students, educators, and institutions

The research AI schools can actually stand behind.

Generative AI is being restricted across high schools, colleges, and universities because it bypasses thinking and produces text no one can trace. Cestus is built the other way: research first, sources always, and a workspace designed around academic integrity.

  1. 01

    Traceable intelligence.

    Every assertion, scenario, and data point ties back to a vetted primary source. Nothing to take on faith, nothing a student or a professor cannot check for themselves.

  2. 02

    It enhances thinking, it does not do it for you.

    Cestus will not write the paper. It gives students an objective place to test a hypothesis and weigh outcomes, so the reasoning stays theirs. It teaches how to think, not what to think.

  3. 03

    Built to be welcomed, not banned.

    Where generative AI is being restricted for bypassing critical thinking, a transparent, multi-lens, sourced workspace is one educators can put in front of a class without lowering the bar.

  4. 04

    The standard we are building toward.

    By addressing academic dishonesty and shallow generation at the root, Cestus aims to become the verified, licensed decision workspace for institutions worldwide.

Bringing Cestus to a campus or program? Talk to us about institutional access.

Questions, answered plainly

The things people ask before they commit.

What is CestusAI?
CestusAI is a decision-intelligence research workspace. Instead of handing you an answer, it helps you form a view you can defend: every claim sourced, every counterpoint surfaced, and your own conviction tracked over time.
How is CestusAI different from a chatbot or a search engine?
Chatbots and search engines are built to give you an answer. CestusAI is built to help you form one. It reads the record, shows its real sources with the disagreements left in, argues the strongest honest case against you, and tracks how your conviction changes over time.
What are the five lenses?
Research, Devil’s Advocate, Verify, Compare, and Simulate. Each shapes the answer differently depending on the decision you are carrying. You can pick a lens, or let Cestus choose and tell you which one it used and why.
Does CestusAI decide for me?
No. The verbs stay yours. Cestus lays out the case and the counterpoint; you are the one who commits, or does not. It serves your judgment, it never replaces it.
Can students and schools use CestusAI?
Yes, and it is built for them. Where generative AI is being restricted for bypassing critical thinking, Cestus is research-first and source-anchored: every assertion ties back to a vetted primary source, it will not write the paper for a student, and it gives an objective workspace to test a hypothesis and weigh outcomes. It is designed around academic integrity, to be welcomed by educators rather than banned.
How do I get access?
Access opens in cohorts. Join the waitlist with your email and you will get one message when your cohort opens. More than 4,600 people are already on the waitlist.
How is my data handled?
Waitlist addresses are stored with EU data residency and used only to tell you when access opens. They are never sold, and you can have your address deleted on request.

Access is opening, selectively

Answers tell you what to think.Cestus helps you decide.

One email when we open the next cohort. No drip campaign, no tracking pixel, no third party we do not name here. Unsubscribe in one click.

A single confirmation email. EU data residency. Deletion is one request away.