CDC-based pool and spa water test log with deterministic compliance checks and an auditable record
A fixed sample log, with every number computed by the same checker that runs on your own readings: open the demo log → · the printable A4 log sheet.
Or POST your own readings (a few checks a day need no account):
curl -X POST https://pool-log.rowb.app/api/check -H 'Content-Type: application/json' \
-d '{"readings":[{"at":"2026-10-01T07:30","kind":"pool","ph":7.4,"free_chlorine_ppm":1.9}]}'
Recommended next step. An email address is all it takes. The same key keeps working if you ever move to a paid plan.
The free key keeps working month after month. If you ever reach its monthly limit, the API says so and links to the options — nothing is charged without you.
Part of rowb.app.