# Core: Interval & HIIT Timer — Tabata, Boxing, Workout Rounds > Interval and HIIT timer with custom routines and workout tracking. (iPhone/iPad app by Yating Lu.) - Source: https://appshunter.io/ios/app/core-interval-and-hiit-timer/id1562215374 (this page in markdown: same URL + `.md`) - Developer: [Yating Lu](https://appshunter.io/developer/1526204219) - Category: Health & Fitness, Sports - Price: Free with in-app purchases - Rating: 5.00/5 from 4 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 9 MB - Languages: American English, French (France), German (Germany), Japanese, Korean, European Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan) - Released: 2021-04-28 - Data updated: 2026-10-30 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/core-interval-and-hiit-timer/id1562215374/reviews.md ## What is Core? 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! ## Key features - 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 ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Monthly | $1.99 | per month | | Yearly | $9.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Lifetime | $14.99 | one-time | ## Is Core safe? Not enough ratings yet to assess Core. ## Is Core legit? Core: Interval & HIIT Timer appears to be a legitimate app. The AppsHunter Legitimacy Score for Core is 90 out of 100 points across 7 verification signals from App Store and developer data. ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/core-interval-and-hiit-timer/id1562215374/reviews.md ### 5/5 — Core timer *2024-03-08, version 1.0.2* Good apps to keep track of training workout ### 5/5 — Good app *2023-01-17, version 1.0.2* Awesome app without any mistakes ### 5/5 — Thank You *2023-01-07* What an absolutely beautiful app! Thank you for developing it so great. ### 5/5 — Workout, Pomadoro, Baking Multiple uses! *2023-01-06* Using the app is Ez and fun! Keeping track of time for working out is by design… using it as a pomadoro method timer works perfectly! (ADHDers try it!) 3 cheers Developers! Thanks ### 5/5 — Helpful app! *2022-12-16* I used it for my interval trainings, and it’s very helpful to keep track of time in workout. I can easily customize the time and sets I want to workout and also a timer for a small water break. Awesome App! ### 5/5 — No sound on IOS 16.1.1 *2022-11-26, version 1.0.2* I have been using Core Timer daily which is simple but effective. Unfortunately after upgrading my IOS to 16.1.1 today, no sound can be heard when previously set workout is played. The other apps on the phone can play sound as before. Possible to patch the app to overcome the issue? ## Frequently asked questions about Core ### What is Core's primary function? Core is designed to manage workout intervals, allowing users to set work times, rest times, and sets. It provides clear countdowns and audio cues to guide users through their training sessions. ### Can I create custom workouts with Core? Yes, you can build custom timers for various training styles like HIIT, Tabata, circuit training, or boxing rounds. These saved workouts can be readily accessed for future training sessions. ### How does Core help me track my progress? The app allows you to revisit completed sessions and view your weekly training trends. This history provides insights into your training efforts beyond the immediate workout. ### What features are included in Core Pro? Core Pro unlocks unlimited timers, duplicates, full workout history, monthly and yearly trends, and CSV export. These advanced features require an in-app purchase. ### How much does Core Pro cost? Subscription plans for Core Pro are available with monthly pricing at $1.99 and yearly pricing at $9.99. These prices are displayed before purchase within the app. ### How do I cancel my Core Pro subscription? You can manage or cancel your auto-renewable subscription at any time through your App Store account settings. Cancellation must be done at least 24 hours before the current subscription period ends. ### What devices is Core compatible with? Core is currently supported on iPhone and iPod devices. The app is rated for ages 4 and up. ### How often is Core updated? The latest version of Core is 1.1, last updated on October 28, 2026. This indicates a recent update, suggesting ongoing development and support. ## Version history (last 3 releases) ### 1.1 — 2026-10-28 A clearer view of every workout • Revisit completed sessions and weekly training trends • Keep your usual work, rest and set settings in saved workouts • Explore monthly and yearly trends and export CSV with Core Pro • Refined countdown screens and audio cues ### 1.0.2 — 2021-05-16 - Add workout reminder feature - Separate the creation of a new timer and new counter - User Experience optimization ### 1.0 — 2021-04-28 No release notes. ## Apps similar to Core | App | Rating | Price | Category | | --- | --- | --- | --- | | [Tabata Timer - Boxing Timer](https://appshunter.io/ios/app/tabata-timer-boxing-timer/id6474062808) | 3.8 (9) | Free | Health & Fitness | | [Workout Timer - Interval Timer](https://appshunter.io/ios/app/workout-timer-interval-timer/id1580218001) | 4.7 (24) | Free | Health & Fitness | | [SwolTime-Tabata Interval Timer](https://appshunter.io/ios/app/swoltime-tabata-interval-timer/id1601731155) | 5.0 (53) | Free | Health & Fitness | | [Interval Timer - Multiple HIIT](https://appshunter.io/ios/app/interval-timer-multiple-hiit/id1598597704) | 4.9 (143) | Free | Health & Fitness | | [Round Timer: Training, Debate](https://appshunter.io/ios/app/round-timer-training-debate/id6458691329) | 4.9 (14) | Free | Health & Fitness | | [Custom Interval Timers](https://appshunter.io/ios/app/custom-interval-timers/id1552160706) | 5.0 (14) | Free | Health & Fitness | ## More apps by Yating Lu - [Focus & Pomodoro Timer - Foca](https://appshunter.io/ios/app/focus-and-pomodoro-timer-foca/id1526204217) - [Dayfold - Countdown & Widgets](https://appshunter.io/ios/app/dayfold-countdown-and-widgets/id6802240198) All apps by Yating Lu: https://appshunter.io/developer/1526204219 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-30.*