Interval Timer vs Core
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Interval Timer
This professional and easy-to-use interval timer allows for customizable circuit training plans with voice prompts and background operation. It supports music integration and Apple Health, making it ideal for various fitness routines.
- Customizable training plans
- Smart voice prompts
- Automatic music playback
- Background operation
- Apple Health integration
- Apple Watch support
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Congratulations! You have found the most professional and easy-to-use Interval Timer in App Store. This is different from those with complex operation or gaudy functions. It is easy to set up all kinds of circuit training plans. You can custom your exercise library, adjust theirs duration flexibly, and the dial interface is the settings page that allows you to complete most of the normal operations. WYSIWYG! Next time you work out, maybe you’d like to try this practical voice coach fitness app! This app also has more powerful and practical functions. It includes warm-up, cold-down, recover and work out sessions, and also theirs duration can be changed flexibly. It can change the music automatically during your workout if you have subscribed the apple music service. This app is suitable for personal trainers, fitness enthusiasts, bodybuilders, athletes, home exerciser and etc. Use with HIIT, Tabata, weight training, kettlebells, HIIT running, sprints, HIIT treadmill, and any interval fitness training. Help to establish a scientific, systematic, based on your characteristics and personalized training program and maximize your workout are all we can do. Depends on no equipment and exercise anywhere or anytime! Hope you enjoy it. AT A GLANCE: + Easy to customize you training plan + Smart voice prompts + Automatically play and change music + prompts the next workout name + Fully customizable times, cycles and repeats + Can run in the background + Clean and smart design + Great on iphone X + Support Siri ("Hey Siri, start a workout using Fit Now") + Support Apple Watch, Standalone Apple Watch workouts. Leave your iPhone at home! + Apple Health integration MORE INFORMATION: • Easy Customize Touch what you want to change to set work time, rest time, cycles, repeats, warm up time and cooldown time. Stopwatchs can be set in 1 second increments up to 60 minutes! • Customize your training plan You can custom every single attribute like moves and its duration, and accordingly the voice system will prompts you what the next move is. • Smart voice prompts system this app will alerts you when it is time to work, rest, warmup or cooldown, even when this app is running in the background. You can preset your workout names for per cycle, and this app will call out them while the timer begins working. You can turn off the voice prompts, and choose the vibration mode. • Automatically play music this app allows you to set different playlists for each of the work duration, rest duration, warm up duration and cool down duration, and is easy to change the currently playing song in iPhone control center. Or you can just choose any music app you like, this app supports multitasking. • Runs in the background When the timer starts working, you can lock screen and run it in the background, and have it play voice prompts. Once your training plan ends, it won't run in the background any more, in case of more battery drain.
Core
This app helps you stay focused during workouts by managing intervals, work times, and rest periods with clear visual and audio cues. Save custom routines for HIIT, Tabata, or boxing, and track your training history to monitor progress.
- Customizable interval timers
- Audio cues for work/rest phases
- Save and reuse workout routines
- Visual countdown and color coding
- Workout history and trend tracking
- Optional Pro features via in-app purchase
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Keep your focus on the workout Core takes care of the intervals, so you can stay with your training. Set your work time, rest time and sets, then follow a clear countdown and audio cues from the first round to the last. Made for your routine Build a timer for HIIT, Tabata, circuit training or boxing rounds. Save your usual workouts and have them ready when it is time to train again. Know when to move and when to recover A large countdown and distinct work and rest colors make each phase easy to recognize at a glance. Choose audio cues that suit the way you train. See the work you have put in Revisit completed sessions and see your weekly training trends. Your training history gives every session a place beyond the final countdown. Go further with Core Pro Unlock unlimited timers and duplicates, full workout history, monthly and yearly trends, and CSV export. These features require an in-app purchase. Core Pro is optional. Available plans and prices are shown before purchase. If you choose an auto-renewable subscription, payment is charged to your Apple Account at confirmation. It renews automatically unless canceled at least 24 hours before the current period ends. Manage or cancel your subscription in your App Store account settings. Privacy policy: https://yating-900.github.io/core-timer-site/privacy.html Terms of use: https://yating-900.github.io/core-timer-site/terms.html If you have any ideas to improve the App, please contact us via coretimerapp@gmail.com. Your feedback is highly valued!
Screenshots
Verdict
The clearest difference is rating: Core at 5.0 against Interval Timer's 3.8. Core also leads on review sentiment (100% vs 67%). Interval Timer's advantage is update cadence (weekly vs every 33 months) and monetization model (free vs freemium). On price, ads, 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
Both are free to download. Interval Timer sells 1 one-off in-app purchase and Core sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
Core holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: Interval Timer has 28 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 67% of Interval Timer's written reviews are positive against 100% of Core's.
Interval Timer ships an update weekly, Core every 33 months. The most recent releases landed on November 9, 2026 and November 3, 2026 respectively.
| Parameter | Interval Timer | Core |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (28 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 28 — better | 4 |
| Update frequency | Weekly — better | Every 33 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, iPod |
| Requires iOS | 11.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 30 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | 宇超 朱 | Yating Lu |
Customer experience
Interval Timer
Core
In-app purchases
Interval Timer
- UNLIMITED HIIT TIMER$3.99
Core
- Monthly$1.991 Month
- Yearly$9.991 Year
- Lifetime$14.99









