HydroLog vs Sync Period
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HydroLog
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HydroLog is the intelligent hydration companion built for people who care about performance and accuracy. It integrates directly with Apple Health to track hydration, caffeine and alcohol intake with scientific rigour, calculating dynamic daily goals from your weight and enabling frictionless logging that fits a high-velocity lifestyle. WHAT YOU GET - Progress rings and a complete drink catalog - One-tap logging and custom containers - Apple Health sync, two-way and automatic - Automatic caffeine and alcohol monitoring - Advanced analytics and history exports - Climate-based goal adjustments (Premium) - Smart reminders that adapt to your day - Full Apple Watch support and widgets A SCIENCE-BACKED MODEL HydroLog applies a hydration model where beverages have different effectiveness. Coffee, tea, soda, energy drinks, beer and wine are normalised through multipliers to reflect real-world impact. The result is more accurate data, smarter insight and a stronger personal health stack. BUILT FOR Athletes, wellness-focused users, coffee enthusiasts, responsible drinkers and data-driven individuals who depend on consistent metrics across the Apple ecosystem. PREMIUM Unlocks advanced analytics, exports, dynamic goals, smart reminders and weather-based adjustments. TOTAL PRIVACY No external servers. All data stays on your device. Upgrade your hydration strategy. Install HydroLog and operate with precision. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Sync Period
This health app offers a simple and intuitive way to monitor your menstrual cycles. It allows you to log periods, emotions, symptoms, and energy levels, providing insights and reminders for your next cycle. Personalized notes and a monthly calendar view help you stay informed about your reproductive health.
- Period tracking
- Symptom logging
- Emotion tracking
- Energy level logging
- Cycle insights
- Period reminders
- Notes and calendar view
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Minimal, clean, thoughtful health app - Easily Track Your Periods - Log Period, Emotions, Symptoms, Energy - Current Cycle Info - Write Personalized Notes - Stats & Monthly Calendar View - Next Period Estimate - Next Period Reminder Notification Any questions or feedback? Reach out at startinjune.apps@gmail.com Privacy Policy & Terms https://startinjune-apps.github.io/syncperiod/privacy https://startinjune-apps.github.io/syncperiod/terms
Screenshots
Verdict
The clearest difference is in-app purchases: Sync Period at none against HydroLog's 7. HydroLog's advantage is update cadence (every 8 days vs every 3 months). 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. HydroLog sells 7 in-app purchases, starting at $0.99 per month. Sync Period asks for nothing beyond the download.
HydroLog ships an update every 8 days, Sync Period every 3 months. Both last shipped on October 31, 2026.
| Parameter | HydroLog | Sync Period |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 8 days — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone, Apple Watch — better | iPhone |
| Requires iOS | 18.6 | 18.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Andre Moura | Start in June LLC |
In-app purchases
HydroLog
- Monthly$0.991 Month
- HydroLog Premium 1 Month7 Days trial$1.991 Month
- Annual$1.991 Month
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- Annual$7.991 Year
- HydroLog Premium 1 Year7 Days trial$12.991 Year
- Monthly$12.991 Month
- Premium$17.99
Sync Period
No in-app purchases









