Everything is free, and there is nowhere to pay.
All 29 calculators are free, unlimited and need no account. This page states how far that goes, and what we would say first if anything were ever charged for.
Free right now
No account is required, and no name or contact detail is recorded.
- Every calculator, without limits
- The full reading, its basis and its sources
- Pages and results in five languages
- The feedback form under a result (optional, used to fix errors)
What might be charged for later
None of this is built yet. Until it is, no price and no payment button will appear on the site.
- Turning a computed result into a longer written report
- Follow-up questions and comparing several methods on one question
- Exporting or keeping your own records long term
No payments are accepted
No payment method is connected to this site. Any page asking you to pay here is not ours.