BookFit vs Interval Timer □ HIIT Timer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BookFit
Easily manage your fitness journey with this free app. Book and cancel sports classes, join waitlists, and receive important updates from instructors. Discover fitness classes searchable by location.
- Book and cancel classes online
- Join reserve lists for class openings
- Receive instructor messages
- Searchable fitness class directory
- Easy and simple to use
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Get Fit. Stay Fit. BookFit. Manage your fitness on the move with this free sports class booking app. BookFit will let you take control of your fitness and make sure that you never miss out on a class again. Reasons to love BookFit * Easy and simple to use app * Book & cancel classes online * Join a reserve list & get notified if a class space becomes free * Receive important messages from Instructors * Access to a directory of fitness classes – searchable by location
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.
- Customizable intervals
- Workout and rest timers
- Voice or beep guides
- Background audio support
- Workout history and statistics
- Repeat previous workouts
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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
Screenshots
Verdict
The clearest difference is review sentiment: Interval Timer □ HIIT Timer at 61% against BookFit's 25%. Interval Timer □ HIIT Timer also leads on ratings volume (86K vs 1). BookFit's advantage is in-app purchases (none vs 5) and rating (5.0 vs 4.8). 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
Both are free to download. Interval Timer □ HIIT Timer sells 5 in-app purchases, starting at $1.99 per month. BookFit asks for nothing beyond the download.
BookFit holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Interval Timer □ HIIT Timer has 86K ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 25% of BookFit's written reviews are positive against 61% of Interval Timer □ HIIT Timer's, so the app with the better star average is not the one people write more warmly about.
BookFit ships an update every 3 weeks, Interval Timer □ HIIT Timer every 5 weeks. The most recent releases landed on September 16, 2026 and October 2, 2026 respectively.
| Parameter | BookFit | Interval Timer □ HIIT Timer |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.8 (86K ratings) |
| Positive reviews | 25.0% of reviews | 60.7% of reviews — better |
| Number of ratings | 1 | 86K — better |
| Update frequency | Every 3 weeks — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 57 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | SD17 | Float Tech, LLC |
Customer experience
BookFit
Interval Timer □ HIIT Timer
Bugs and requests
BookFit
Not enough reviews yet to summarise bugs or 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
In-app purchases
BookFit
No in-app purchases
Interval Timer □ HIIT Timer
- Premium Pass7 Days trial$1.991 Month
- Premium Pass7 Days trial$2.991 Month
- Lifetime Pass$14.99
- Lifetime Pass$19.99
- Premium Forever Promo$29.99
Questions
Is BookFit free?
Is Interval Timer □ HIIT Timer free?
Which has better reviews, BookFit or Interval Timer □ HIIT Timer?
Do BookFit or Interval Timer □ HIIT Timer have ads?
Which is updated more often, BookFit or Interval Timer □ HIIT Timer?
Other comparisons
