JustPeriod. vs CycleSync
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
JustPeriod.
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JustPeriod. is a cycle tracker built on two simple principles: your cycle is nobody's business but yours, and the people close to you can be there — only on your terms. SHARE YOUR CYCLE, OR FOLLOW YOUR PARTNER'S • Connect with a one-time code — no sign-ups, no accounts to create. • Both partners can track their cycles side by side — for every kind of couple, including those where you both have a cycle. • Your partner sees exactly what you allow: days, symptoms, predictions or the current phase — every item is set separately. • Send a sign of support in one tap, and on period days share what you'd like, in your own words. • A quiet widget for the Home Screen and Lock Screen: a name, a phase and a countdown, and nothing for anyone nearby to read. • Turn sharing off at any moment — the data disappears from your partner's phone straight away. FOR REAL BODIES AND REAL LIFE • Dedicated modes for PCOS, endometriosis, fibroids and PMDD. • Predictions that account for your contraception (pill, IUD, implants and other methods). • Change your condition or your method at any time — the forecast adapts to the new answers immediately. • Honest support for an irregular cycle, with no illusion that a body should run like clockwork. • No hints about pregnancy and no pressure around fertility — there is simply nothing here for ovulation or conception. STATISTICS WITHOUT EMPTY PROMISES • A clear summary, your cycle history and a cycle map — all on one screen. • Average cycle and period length come with their real spread, not a single "perfect" number. • The intensity scale shows your usual flow and marks the days it departs from it. • The cycle map shows which days particular symptoms tend to fall on. PRIVACY AT THE FOUNDATION • All your data is kept on your device alone, protected by iOS encryption. • Optional sync and shared access are protected by end-to-end encryption: we could not read your data even if we wanted to. • No accounts, no ads, no analytics. Your data is never passed to anyone. • Face ID / Touch ID / PIN to get in, and an instant privacy screen. • Protected export with a password (PDF, CSV, JSON) and encrypted backups. • A simple, quick move of your history from Flo, Clue or WomanLog in a couple of minutes. EVERY BASIC FEATURE, AT ITS BEST • A calendar and predictions that fit your settings completely. • More than 20 built-in symptoms, and room to create your own. • Private notes on any day — kept in your history and included in exports. • Handy widgets for the Home and Lock Screens, plus an Apple Watch app. • Discreet reminders that give away no details in notifications. HONEST, TRANSPARENT PRICING Every basic feature — tracking, calendar, statistics, import, export, backups and reminders — stays free forever. Shared access and themes open with a single lifetime purchase: no subscriptions, no hidden charges. JustPeriod. Know your body. On your terms.
CycleSync
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Умный календарь менструаций с точными прогнозами. Алгоритм анализирует историю ваших циклов для предсказания даты следующих месячных с высокой точностью. Отмечайте начало и конец цикла, интенсивность выделений и любые отклонения от нормы. Калькулятор овуляции и фертильности. Отслеживайте наиболее благоприятные дни для зачатия с помощью точного расчёта окна фертильности. Визуальные индикаторы помогут легко ориентироваться в календаре. Подробная статистика и аналитика. Просматривайте историю циклов, анализируйте регулярность и отслеживайте средние показатели. Приложение покажет среднюю длину цикла и продолжительность менструации. Отслеживание симптомов и самочувствия. Четыре уровня интенсивности выделений, множество симптомов для отслеживания, базальная температура для точного определения овуляции и личные заметки для каждого дня. Режим беременности. Подсчёт недель беременности, расчёт предварительной даты родов, визуальные индикаторы по триместрам. Уведомления о цикле отключаются автоматически при начале отслеживания беременности. Умные уведомления и напоминания. Напоминание о менструации за один до пяти дней до начала. Напоминание об овуляции за один до трёх дней до овуляции. Ежедневное напоминание отметить день в выбранное время. Напоминание о приёме таблеток в установленное время.
Screenshots
Verdict
The clearest difference is in-app purchases: CycleSync at none against JustPeriod.'s 1. CycleSync also leads on update cadence (every 2 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. JustPeriod. sells 1 one-off in-app purchase. CycleSync asks for nothing beyond the download.
JustPeriod. ships an update every 3 weeks, CycleSync every 2 days. Both last shipped on October 12, 2026.
| Parameter | JustPeriod. | CycleSync |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 20 MB | 2 MB |
| Age rating | 12+ | 17+ |
| Developer | AiVax | Sergei Antropov |
In-app purchases
JustPeriod.
- Lifetime Access$59.99
CycleSync
No in-app purchases








