Mori is a free period and cycle tracker for Android that never asks for an account. Everything — logging, calendar, cycle estimates with confidence ranges, insights, export — runs entirely on-device and works fully offline. Records stay on the phone unless you opt into encrypted cloud sync ($3.99 one-time, lifetime, no subscription). Predictions are honest estimates shown as date ranges with their basis, not fake precision. Available in English and Chinese.

Mori

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