Comparison

Hydra vs Swim Set Interval Timer

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

Head to head
About

Hydra

Features
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Hydra is a hydration tracker built around a single gesture: drag up anywhere on the home screen and watch the water rise to where you logged. Most water apps use a generic 2L target. Hydra calculates yours from your weight, sex, activity level, and climate — then bumps it up automatically when you take creatine. Because creatine pulls water into your muscle cells, you actually need more. DESIGNED AROUND THE WAY YOU DRINK • Drag to pour — pan up anywhere on the home screen • Quick-add presets for a glass (250ml), bottle (500ml), or shaker (700ml) • Custom amounts for anything in between • A live water-level background that fills as you progress CREATINE-AWARE TARGETS • One-tap daily creatine pill • Target adjusts automatically: +500ml per 5g dose • Personalized baseline from weight, sex, activity, and climate STREAKS THAT FORGIVE A BAD DAY • Daily streak counter • Personal best tracking • One streak freeze per week • Milestone glow effects every 7 days PRIVATE BY DEFAULT • No account, no login, no email • No analytics, no trackers, no ads • Everything stays on your device Drag to pour. Hit your goal. Build the streak. --- SUBSCRIPTION DETAILS Hydra Pro is available as an auto-renewing subscription: • Hydra Pro Monthly — £4.99 / month • Hydra Pro Annual — £29.99 / year (save 50%) Prices may vary by region. Subscriptions automatically renew unless cancelled at least 24 hours before the end of the current period. Payment is charged to your Apple ID at confirmation of purchase. Manage or cancel any time in your Apple ID account settings. Privacy Policy: https://polar-blanket-f7a.notion.site/Hydra-Privacy-Policy-34f767e65704814b89b5fc807bb09a3d Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Swim Set Interval Timer

Features
Read full description

Swim Set Interval Timer is an easy‑to‑use swim interval timer for swimmers, coaches, triathletes and teams who run structured repeat sets. Designed for reliability and clarity, it combines iPhone‑based timing with an Apple Watch companion app for quick access and at‑a‑glance progress. Build repeatable swim sets, track intervals accurately, and focus on training—not managing a stopwatch or losing track of set count. Key Features: Flexible interval sets -Build swim sets with configurable intervals and repeat counts. Customizable timing modes -Choose how your intervals display and behave: -Count up or down -Optional goal hold time indicators -Available countdown blinking and/or audible beeps -Color customization to match your preferences or improve visibility on deck Phone‑first, reliable timing -The iPhone acts as the primary timer to ensure consistent and accurate set tracking. Apple Watch companion app -View live interval progress, start sets remotely, and stay in sync with your phone during workouts. Automatic resync -If the Watch display sleeps, it reconnects and updates instantly when you raise your wrist. Sharable set log -Automatically log completed sets and share your workout results with teammates, coaches, or training partners. Simple, focused design -No clutter — just the timing information swimmers and coaches actually need. Who It’s For: -Competitive swimmers running structured sets -Coaches providing interval-based practices from the pool deck -Athletes who want a clear, repeatable interval routine -Anyone who prefers simplicity over overloaded workout apps Apple Watch Notes: The Apple Watch app works as a companion to the iPhone app. Timing continues on the phone if the Watch screen goes to sleep, and the Watch display updates automatically when it becomes active again.

Screenshots

Hydra4 screens
Swim Set Interval Timer4 screens

Verdict

The call

The clearest difference is price: Hydra at Free against Swim Set Interval Timer's $1.99. Hydra also leads on iOS requirement (15.1 vs 26.4). Swim Set Interval Timer's advantage is in-app purchases (none vs 2). On 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

CostPrice · In-app purchases · Ads · Monetization

Hydra is free to download; Swim Set Interval Timer costs $1.99 up front. Hydra sells 2 in-app purchases, starting at $6.99 per month. Swim Set Interval Timer asks for nothing beyond the download.

Scorecard3 real differences · 2 level
Hydra versus Swim Set Interval Timer: the parameters behind the verdict, then further details
ParameterHydraSwim Set Interval Timer
PriceFree — better$1.99
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15.1 — better26.4
Further details — not scored
Size41 MB5 MB
Age rating12+4+
DeveloperRyan CrearySTEVEN BRENT LEEPER

In-app purchases

2 purchases

Hydra

Subscriptions2
  • Hydra Pro Monthly3 Days trial$6.991 Month
  • Hydra Pro Annual3 Days trial$39.991 Year
None

Swim Set Interval Timer

No in-app purchases

Questions

Is Hydra free?
Hydra is free to download, with in-app purchases available.
Is Swim Set Interval Timer free?
Swim Set Interval Timer costs $1.99, with no in-app purchases.
Do Hydra or Swim Set Interval Timer have ads?
Neither Hydra nor Swim Set Interval Timer shows ads.

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