Evidence, not selective memory.

KYSTA is an evidence logger for behavioural change. It supports behaviours you want to build, reduce, stop, keep within a range, complete or simply understand.

You can start from a KYSTA example or create a custom goal from scratch, including your own activities, measurements, target and schedule.

The app is not a medical treatment, a diagnostic tool or a replacement for professional help. It is a private record of the targets and evidence you choose.

Choose the behaviour and target. Log the actual event or explicit zero. Review Today, Calendar, Progress and the weekly receipt. Correct an inaccurate entry without pretending it was never changed.

• Fast evidence entry with typed measurements
• Build, reduce, stop, range and track-only directions
• Daily reflection and encrypted qualitative notes
• Calendar history, weekly receipts and progress views
• Evidence-backed achievements and portable exports

Period-over-period narratives, public receipt links, challenge participation, referrals and richer share controls are product-plan items. They are not presented as available until the backend and privacy controls exist.