Comparison

onTrack vs Hydra

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

Head to head
About

onTrack

Effortlessly monitor your daily active and resting calorie burn, and track your food intake against personalized targets. Stay motivated with customizable home screen widgets that display your progress at a glance.

Highlights
  • Automatic activity and calorie syncing
  • Monitor burned calories with progress bars
  • Track consumed calories and meal targets
  • Home screen widgets for instant data view
  • Customizable graph and widget colors
Features
Read full description

OnTrack is a calorie tracking app that works best with Apple Watch and Apple Health. It automatically syncs your activity and calorie data to help you stay on top of your fitness goals. Whether you’re training for performance or just staying active, OnTrack provides intuitive insights that keep you motivated and informed every step of the way. Daily Activity Effortlessly monitor your daily activity, calorie burn, and more through dynamic progress bars and weekly charts. See how your current totals compare against your goals with real-time updates and personalized visuals. Apple Watch users will benefit from the most accurate tracking, making OnTrack a powerful tool for understanding your energy expenditure. Meal Logging Track your daily intake and see how your meals stack up against your targets. Weekly consumption graphs help visualize trends, while simple summaries highlight how close you are to reaching your calorie goals each day. Widgets Stay motivated with powerful widgets that bring your data to your Home Screen and Lock Screen. Instantly view daily activity stats all without opening the app. Widgets are color-coded and customizable (with upgrade), keeping your progress front and center throughout the day. Customization Make your experience your own by purchasing color customization for graphs and widgets for $6.99. Personalize metric colors, heatmap themes, and widget backgrounds across the app and your widgets. Match your style and stay motivated.

About

Hydra

Features
Read full description

Stay hydrated. Stay healthy. Stay motivated. Hydra makes drinking water simple and fun with smart reminders, personalized daily goals, and playful visuals that grow as you do. Why Hydra? - Personalized goals – Set your hydration target based on your weight, activity, and climate. - Smart reminders – Gentle nudges only when you forget, not when you don’t need them. - Fun visuals – Watch your water drop change mood as you progress. - Custom units – Track in milliliters or ounces, whichever you prefer. - History & stats – Stay motivated with streaks, charts, and calendar view. - Log flexibility – Add water in one tap, or backfill previous days. - Share progress – Inspire friends by sharing your hydration streak. Hydra is your everyday hydration companion, helping you build healthy habits that last. Drink more water, feel better, and celebrate every sip! Terms of Use : https://docs.google.com/document/d/1L39-ZwqprKT-KU5KxO7sfgZeDnqwcNW3uvf2wJ_lKGM/edit?tab=t.0#heading=h.m4qldp55qjhd Privacy Policy : https://docs.google.com/document/d/1PRwKSTVWL17rrGDhZZ8yF7oP-vU7BIVfeVrskT7CEv8/edit?tab=t.0#heading=h.3hqjbmiuocvt

Screenshots

onTrack3 screens
Hydra4 screens

Verdict

The call

The clearest difference is ads: onTrack at none against Hydra's shown. Hydra's advantage is update cadence (fortnightly vs every 7 months) and iOS requirement (15.0 vs 17.0). On price, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. onTrack sells 1 one-off in-app purchase and Hydra sells 6 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

onTrack ships an update every 7 months, Hydra fortnightly. The most recent releases landed on October 8, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 6 level
onTrack versus Hydra: the parameters behind the verdict, then further details
ParameteronTrackHydra
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 7 monthsFortnightly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.0 — better
Further details — not scored
Size3 MB75 MB
Age rating17+12+
DeveloperAnuj ShelatANASTASIYA BATURYNA

In-app purchases

1 purchases

onTrack

One-time1
  • Customization Feature$6.99
6 purchases

Hydra

Subscriptions5
  • VIP Monthly$5.991 Month
  • VIP Monthly 3 days free3 Days trial$5.991 Month
  • VIP Yearly 85% Off$10.991 Year
Show 2 more
  • VIP Annual$29.991 Year
  • VIP Annual 7 days free$49.991 Year
One-time1
  • VIP Lifetime$29.99

Questions

Is onTrack free?
onTrack is free to download, with in-app purchases available.
Is Hydra free?
Hydra is free to download, with in-app purchases available.
Do onTrack or Hydra have ads?
Hydra shows ads; onTrack does not.
Which is updated more often, onTrack or Hydra?
onTrack ships an update every 7 months, and Hydra fortnightly. Most recently, onTrack was updated on October 8, 2026 and Hydra on October 30, 2026.

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