Flow State Cycle vs Cycle Sync
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Flow State Cycle
This private period tracker logs your cycle with a single tap and uses your data for smart predictions. It offers symptom and mood tracking, cycle insights, and doctor-ready reports. Your health data stays on your device, ensuring complete privacy.
- Smart cycle predictions
- Symptom and mood logging
- Cycle insights and patterns
- Doctor-ready PDF reports
- Health ecosystem sync
- CSV data export
- Dark mode support
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Flow State is a private, local-first period tracker that keeps your health data on your device — no account required, no cloud, no tracking. Log your period with a single tap. Flow State learns your unique cycle and predicts your next period using your own data, not assumptions. FEATURES • Smart predictions — weighted rolling average based on your cycle history, not a generic 28-day guess • Symptom and mood tracking — log cramps, headache, fatigue, mood changes, and more • Cycle insights — flow intensity patterns, symptom frequency, mood distribution, and correlations • Doctor-ready PDF report — share a clean summary with your healthcare provider • Apple Health and Google Health Connect sync — read and write menstrual data across your health ecosystem • Curated essentials — helpful products for each phase of your cycle • Dark mode — full light, dark, and system theme support • CSV export — download your complete cycle history anytime PRIVACY FIRST Your data never leaves your device. No account, no servers, no analytics, no ads. Period.
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: • Events on heavy-flow days • Events on rest-phase days • 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. NO AI. NO GUESSING. 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. WHAT'S FREE • Cycle logging and phase prediction • Calendar sync (Apple Calendar and Google Calendar) • Dashboard with today's phase and a 7-day overview • Basic conflict detection • Five notification types including phase transitions, daily insights, and period predictions • Cycle history for the last three cycles • Focus and rest customization for each phase • Light, Dark, and System themes WHAT'S PRO Unlock everything: • Unlimited reschedule suggestions • One-tap rescheduling with undo • Advanced conflict detection • Unlimited phase history • Priority notifications • Tomorrow's preview alerts • Re-engagement reminders PRIVACY FIRST • All cycle data is stored locally on your device • No cloud sync and no tracking • Health data is read-only from Apple Health • 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 in-app purchases: Flow State Cycle at none against Cycle Sync's 3. Flow State Cycle also leads on iOS requirement (15.1 vs 18.2). On price, update cadence, ads and device support 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. Cycle Sync sells 3 in-app purchases, starting at $4.99 per 7 days. Flow State Cycle asks for nothing beyond the download.
Flow State Cycle ships an update every 3 weeks, Cycle Sync fortnightly. The most recent releases landed on September 18, 2026 and September 10, 2026 respectively.
| Parameter | Flow State Cycle | Cycle Sync |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.1 — better | 18.2 |
| Further details — not scored | ||
| Size | 33 MB | 55 MB |
| Age rating | 4+ | 4+ |
| Developer | Brett East | Amit Kairon |
In-app purchases
Flow State Cycle
No in-app purchases
Cycle Sync
- CycleSync Pro — Weekly$4.997 Days
- CycleSync Pro$9.991 Month
- CycleSync Pro$59.991 Year
Questions
Is Flow State Cycle free?
Is Cycle Sync free?
Do Flow State Cycle or Cycle Sync have ads?
Which is updated more often, Flow State Cycle or Cycle Sync?
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