Comparison

HydroLog vs Sync Period

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HydroLog

Features
Read full description

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/

About

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.

Highlights
  • Period tracking
  • Symptom logging
  • Emotion tracking
  • Energy level logging
  • Cycle insights
  • Period reminders
  • Notes and calendar view
Read full description

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

HydroLog4 screens
Sync Period3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

HydroLog ships an update every 8 days, Sync Period every 3 months. Both last shipped on October 31, 2026.

Scorecard2 real differences · 7 level
HydroLog versus Sync Period: the parameters behind the verdict, then further details
ParameterHydroLogSync Period
PriceFreeFree
Rating—5.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyEvery 8 days — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS18.618.0 — better
Further details — not scored
Size6 MB6 MB
Age rating4+4+
DeveloperAndre MouraStart in June LLC

In-app purchases

7 purchases

HydroLog

Subscriptions6
  • Monthly$0.991 Month
  • HydroLog Premium 1 Month7 Days trial$1.991 Month
  • Annual$1.991 Month
Show 3 more
  • Annual$7.991 Year
  • HydroLog Premium 1 Year7 Days trial$12.991 Year
  • Monthly$12.991 Month
One-time1
  • Premium$17.99
None

Sync Period

No in-app purchases

Questions

Is HydroLog free?
HydroLog is free to download, with in-app purchases available.
Is Sync Period free?
Sync Period is free to download, with no in-app purchases.
Do HydroLog or Sync Period have ads?
Neither HydroLog nor Sync Period shows ads.
Which is updated more often, HydroLog or Sync Period?
HydroLog ships an update every 8 days, and Sync Period every 3 months. Most recently, HydroLog was updated on October 31, 2026 and Sync Period on October 31, 2026.

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