Selene vs Cycle Sync
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Selene
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Simple, private, and secure. Your cycle data never leaves your phone. Period. βΈ TRULY PRIVATE No accounts. No cloud sync. No analytics. No tracking. Works 100% offline. βΈ MULTI-LANGUAGE SUPPORT English, Simplified & Traditional Chinese, and Spanish. βΈ COMPLETE TRACKING Log periods, flow intensity, 14+ symptoms, mood, and custom symptoms. Get cycle predictions based on your personal history. βΈ BACKUP & EXPORT Import/Backup exports. βΈ BEAUTIFUL & SIMPLE Clean calendar interface. Quick one-tap logging. Insights that actually help. No bloated features you'll never use. FEATURES β’ Track periods with one tap β’ Log flow intensity (light, medium, heavy, spotting) β’ Record 14+ symptoms: cramps, headaches, mood, fatigue, and more β’ Add custom symptoms that matter to you β’ Cycle predictions based on your history β’ Insights and patterns over time β’ Dark mode Selene - from the Greek meaning "Goddess of the Moon" Pay once, own forever. Built with Love by AiofEffect LLC Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://aiofeffect.com/privacy Terms & Conditions: https://aiofeffect.com/terms
Cycle Sync
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CYCLE-AWARE CALENDAR CycleSync helps professional women align their work schedules with their natural menstrual cycle phases. Instead of fighting through low-energy days, you get smart suggestions to move demanding meetings to days when your focus and energy peak. WORK WITH YOUR RHYTHM, NOT AGAINST IT Your cycle isn't an obstacle. It's a compass. Menstrual Phase (Winter) Rest and recovery. Reschedule high-stakes meetings. Follicular Phase (Spring) Rising energy. Schedule creative work and planning. Ovulation Phase (Summer) Peak performance. Take on negotiations and leadership. Luteal Phase (Autumn) Focused wind-down. Finish projects and organize. SMART RESCHEDULING CycleSync connects to your calendar and automatically detects: β’ Events on heavy-flow days β’ Events on rest-phase days β’ Dense meeting days during focus phases (3+ events) One tap on a conflict card opens the Time Slot Picker. Your available slots on better days are pre-calculated. Reschedule in seconds. An undo option gives you 10 seconds to reverse. RULES, NOT GUESSWORK. The recommendation engine is rule-based: 1. Your cycle history predicts your phase for any date. 2. Your phase preferences determine focus or rest classifications. 3. Your calendar events are flagged when they conflict with your classifications. 4. Available slots on recommended-phase days enable one-tap rescheduling. EVERYTHING IN ONE SUBSCRIPTION An active CycleSync Pro subscription unlocks the whole planner: β’ Cycle logging, phase prediction and a 14-day cycle outlook β’ Dashboard with today's phase and a 7-day week view β’ Calendar sync with Apple Calendar and Google Calendar β’ Conflict detection and unlimited reschedule suggestions β’ One-tap rescheduling with a 10-second undo β’ Five notification types: reschedule alerts, phase transitions, period predictions, tomorrow's preview and re-engagement nudges β’ Insights: energy curve, seasonal capacities and full cycle history β’ Cycle import from Apple Health β’ Export your cycle history as JSON or CSV β’ Light, Dark and System themes BEFORE YOU SUBSCRIBE Onboarding and the plan comparison are free, so you can see how CycleSync works before you pay. The planner opens once your subscription is active, and everything you have already logged stays on your device. Weekly, monthly and yearly plans are available in the app. PRIVACY FIRST β’ All cycle data is stored locally on your device β’ No cloud sync and no tracking β’ Health data is read-only from Apple Health β’ Export your data anytime as JSON or CSV HOW TO START 1. Open CycleSync and log your last period start date. 2. Connect your calendar using Apple Calendar or Google Calendar. 3. Set your typical cycle length (default: 28 days). 4. Review your dashboard. Suggested reschedules appear automatically. Download CycleSync and work with your natural rhythm. By subscribing, you agree to our Terms of Use (EULA): https://cyclesync.tunnxo.com/legal/eula.html Privacy Policy: https://cyclesync.tunnxo.com/legal/privacy.html
Screenshots
Verdict
The clearest difference is ads: Selene at none against Cycle Sync's shown. Selene also leads on update cadence (monthly vs every 2 months) and iOS requirement (15.1 vs 18.2). On price, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Selene sells 1 one-off in-app purchase and Cycle Sync sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Selene ships an update monthly, Cycle Sync every 2 months. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.
| Parameter | Selene | Cycle Sync |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly β better | Every 2 months |
| Ads | No β better | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod β better | iPhone, iPad |
| Requires iOS | 15.1 β better | 18.2 |
| Further details β not scored | ||
| Size | 41 MB | 78 MB |
| Age rating | 4+ | 4+ |
| Developer | Aiofeffect LLC | Amit Kairon |
In-app purchases
Selene
- Selene Lifetime$1.99
Cycle Sync
- CycleSync Pro β Weekly$4.997 Days
- CycleSync Pro$9.991 Month
- CycleSync Pro$59.991 Year









