Short answer
Cyca uses pure on-device calendar math — no network connection, no machine learning — to predict ovulation by subtracting the typical luteal length (~14 days) from your average cycle length. It then marks the 5 days before estimated ovulation plus the day of ovulation itself as the fertile window, reflecting the biological window in which sperm can survive up to 5 days to meet an egg. No app can guarantee exact ovulation timing: cycle length varies month to month, and many biological factors affect ovulation that a tracking app cannot observe. Predictions improve as you log more cycles — Cyca averages your most recent 6 cycles.
Try Cyca on a real example first, and check the current App Store listing for exact features and pricing before you decide.
What to look for before choosing
- Fertile window = ~5 days before estimated ovulation + ovulation day itself (~6 days total)
- Ovulation is predicted as: average cycle length minus typical luteal length (~14 days)
- App predictions use your own logged period-start dates, not generic population data
- Accuracy improves with more logged cycles — at least 3–6 cycles gives a more reliable average
- An app is a personal-record tool, not a medical device — never rely on it for clinical decisions
A practical decision process
- Define the job you need done most often.
- Test the app with real content or a realistic scenario.
- Check privacy labels and account requirements.
- Confirm export and backup options.
- Choose the pricing model you are comfortable maintaining.
Quick comparison
| Need | What to check | Why it matters |
|---|---|---|
| Pricing model | Check whether useful features require a subscription, a one-time unlock, or neither. | The cheapest app on day one may not be cheapest after a year. |
| Privacy model | Prefer on-device work when the content is sensitive. | Private documents, resumes, study data, and family content deserve careful handling. |
| Export / lock-in | Confirm file formats, sharing, backup, and deletion controls. | A good app should help you finish the task, not trap your work. |
Where Cyca fits
Cyca is built for exactly this — use the checklist above and test it on a real example.
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This page is an independent buying guide. App Store features and prices can change, so confirm details on the listing before purchase.