Femta: Woman's Calendar
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Full user review
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"Every few months all the data disappears."
Pros
When it works, it uses statistics of prior periods to project the ovulation calendar. Outdated, but intuitively clear interface.
Cons
Save your database regularly. It crushed on me 3 times in one year. The program does not back up the database automatically. The first time it happened, it was very bad, because the data of about 4-5 months just disappeared, never to be found again.
Summary
Save your data regularly. I'd say, at this level of (un)reliability, it is not worth buying.