Pricing
Start with €5 on us.
Confirm your email and €5 lands in your account. Top up €10 later and we'll add another €5. No card to start, no subscription, ever.
How far €5 goes
You pay for what you use, not per request. A short question costs a fraction of a cent; a long report costs more. Roughly:
~500
quick asks
Questions, rewrites, short pieces of text
~140
real work
Analyses, drafts, longer answers
~40
heavy lifting
Documents, reports, a lot of context
Ballpark figures, not a promise. The real cost of every request is shown next to its answer.
When you need more
Top up whatever you like. Credit never expires and isn't tied to a plan.
€10
+ €5 bonus on your first top-up
€25
Most people land here
€50
For daily use
Building something of your own? The same access is available through the API, on the same credit, with no base fee.
10 — questions
Before you sign up.
What can I do with the €5?
Everything. Nothing is locked behind a paid tier and no trial runs out — the credit only goes down when you actually use it.
Do I need a card to start?
No. Confirm your email address and the credit is yours. A payment method only comes up if you decide to top up later.
Which AI model is behind it?
Several, from more than one provider. CALEST picks the path per task, so you never have to choose one — and which model runs behind a tier can change as we measure more. Every answer tells you the tier, what it cost and how long it took.
Does CALEST make every model better?
No, and we have measured that. Three of five models improved significantly — including a frontier model from a second provider. Two showed no measurable difference and still cost more. All five sets of numbers are on this page, including the two that did not work.
Is this just another chatbot?
No. Six stages run before the model sees anything: what you asked for is extracted from your own words, references are resolved, a brief is compiled, a path is picked, and the answer is checked against the brief. The difference shows most when a request is incomplete.
Does it make things up?
It is a language model, so it can. What CALEST adds is a rule and a limit: every requirement it extracts has to point at a span of your own text, and where it has to assume something, it says so in the answer. We are still validating how to measure hallucination reliably, so we don't put a number on the improvement — check anything that matters.
Can a team use this together?
Each person signs in with their own account today — there is no shared workspace and no shared balance. What is shared is the method: the same six stages run whatever anyone types, and every requirement the compiler extracts has to point at a span of that person’s own text. Each answer carries its own cost, per stage, as the provider reported it, so usage is attributable per key rather than estimated at the end of the month.
What’s still missing for a company?
The paperwork, and that is the honest order of it. There is no data processing agreement, no SSO, no SOC 2 report, no EU-only hosting option and no SLA. A company whose procurement requires any of those cannot buy CALEST yet, and no amount of product work changes that — it is contract and audit work. What does exist is on this page with its numbers; what does not is not implied anywhere on it.
What happens to what I type?
It's used to do your work and kept with your account so you can find it again. It is never sold or handed to anyone for training.
Building with the API? The documentation covers the technical side.