Comparison

Interval Timer □ HIIT Timer vs Fast!

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

Head to head
About

Interval Timer □ HIIT Timer

Create custom workout timers with adjustable intervals for exercise and rest. Track your progress with detailed history and statistics, and repeat past workouts easily. Enjoy audio cues without interrupting your music.

Highlights
  • Customizable intervals
  • Workout and rest timers
  • Voice or beep guides
  • Background audio support
  • Workout history and statistics
  • Repeat previous workouts
Features
Read full description

A simple and beautiful interval timer. 1. Drag to set your custom intervals for workout, rest, rounds, etc 2. Tap to start. Interval Timer doesn't interfere with your music or other apps: ∙ Listen to your music apps while you workout. ∙ Voice or beep guides for every workout. ∙ You can leave the app and still listen to the audio guides, in order to follow a workout you found online. And no need to manually record your workouts: ∙ Detailed history and statistics pages to track your progress. ∙ Repeat a previous workout from your history, so you don't need to set it again. If you have any ideas for how to improve the app, just tap "Contact Support' inside the app and let us know! We are always trying to improve Interval Timer This app includes an optional auto-renewable subscription (Premium Pass): Premium Pass beings with a free trial period, then an auto-renewable monthly subscription when trial ends. Payment will be charged to your Apple account at confirmation of purchase and will automatically renew (at the duration/price selected) unless auto-renew is turned off at least 24 hrs before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period. Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your Apple Account Settings after purchase. Any unused portion of the free initial period will be forfeited when you purchase a subscription. Privacy Policy: https://float.support/interval-timer/privacy Terms of Use: https://float.support/interval-timer/terms

About

Fast!

Features
Read full description

Fast! makes intermittent fasting simple and social. Start a timer, watch your body move through each fasting phase — from blood-sugar stabilizing to fat-burning, ketosis, and autophagy — and log how you feel along the way. • Clean, real-time fasting timer with science-backed milestone markers • Track your history, streaks, and progress over time • Connect 1-to-1 with a friend or create a group to fast together and see each other's live progress • Send quick encouragement to keep each other on track • Private by design — your data is yours Whether you do 16:8, 18:6, OMAD, or your own schedule, Fast! helps you stay consistent. FAST! PREMIUM Fast! Premium is an auto-renewing subscription that unlocks unlimited fasting hours, milestones, the journal and friends. The free tier allows 10 hours of fasting and always stays free. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to the end of the current period. You can manage or cancel your subscription in your Apple Account settings after purchase. Terms of Use (EULA): https://fasted.pro/terms Privacy Policy: https://fasted.pro/privacy

Screenshots

Interval Timer □ HIIT Timer4 screens
Fast!3 screens

Verdict

The call

The clearest difference is in-app purchases: Fast! at none against Interval Timer □ HIIT Timer's 5. 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Interval Timer □ HIIT Timer sells 5 in-app purchases, starting at $1.99 per month. Fast! asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 5 weeks. The most recent releases landed on October 5, 2026 and September 28, 2026 respectively.

Scorecard1 real difference · 9 level
Interval Timer □ HIIT Timer versus Fast!: the parameters behind the verdict, then further details
ParameterInterval Timer □ HIIT TimerFast!
PriceFreeFree
Rating4.8 (86K ratings) — better—
Positive reviews60.8% of reviews—
Number of ratings86K — better—
Update frequencyEvery 5 weeksEvery 5 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size34 MB9 MB
Age rating4+4+
DeveloperFloat Tech, LLCchris marinelli

Bugs and requests

Interval Timer □ HIIT Timer

Reported bugs

3 issues
  • Timer not always accurate
  • Favorites/saved workouts feature not working
  • Inconsistent behavior when pausing/resuming

Requested features

3 requests
  • Ability to save and name custom workouts
  • More flexibility in exercise/rest time settings
  • Option to adjust volume of voice prompts

Fast!

Not enough reviews yet to summarise bugs or requests.

In-app purchases

5 purchases

Interval Timer □ HIIT Timer

Subscriptions2
  • Premium Pass7 Days trial$1.991 Month
  • Premium Pass7 Days trial$2.991 Month
One-time3
  • Lifetime Pass$14.99
  • Lifetime Pass$19.99
  • Premium Forever Promo$29.99
None

Fast!

No in-app purchases

Questions

Is Interval Timer □ HIIT Timer free?
Interval Timer □ HIIT Timer is free to download, with in-app purchases available.
Is Fast! free?
Fast! is free to download, with no in-app purchases.
Do Interval Timer □ HIIT Timer or Fast! have ads?
Neither Interval Timer □ HIIT Timer nor Fast! shows ads.
Which is updated more often, Interval Timer □ HIIT Timer or Fast!?
Interval Timer □ HIIT Timer ships an update every 5 weeks, and Fast! every 5 weeks. Most recently, Interval Timer □ HIIT Timer was updated on October 5, 2026 and Fast! on September 28, 2026.

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