Comparison

Stretch Timer Interval HIIT vs FatBurn Watch

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

Head to head
About

Stretch Timer Interval HIIT

This app helps you build and maintain a consistent stretching routine. Customize your workouts with adjustable sets and times, track your progress with a calendar view, and enjoy a user-friendly interface with dark mode support. It's designed to make daily stretching an effortless habit.

Highlights
  • Customizable sets and times
  • Multiple stretching menus
  • Calendar history view
  • Adjustable sound effects
  • Dark mode support
  • Automatic backup (premium)
Features
Read full description

【English Version】 Stay on track as the timer automatically alternates between work and rest. Customize each interval to fit your workout and train your way. Perfect for interval training, strength training, HIIT, circuit training, stretching, and more. Simply set your work time, rest time, and number of sets, and you’re ready to begin. Whether you work out at home or at the gym, this app makes it easy to stay active. It’s also a great choice if you want to build a consistent routine—starting with just two or three workouts a week—to support your health and fitness goals. 【PERFECT FOR YOU IF YOU WANT TO】 • Customize work intervals, rest intervals, and the number of sets • Switch automatically between work and rest • Strength train at home or at the gym • Use a timer for HIIT or circuit training • Focus on your workout instead of counting seconds • Save workout routines tailored to your needs • Review your workout days and track your consistency • Build a lasting exercise habit to stay healthy and fit 【KEY FEATURES】 • Set work and rest intervals freely • Choose the number of sets and repetitions for automatic cycling • Create and register multiple workout routines • Save your custom timers and routines • View the remaining time and current set at a glance with a large, easy-to-read display • Get interval alerts with sound effects, voice countdowns, and vibration • Review your workout history in a calendar • Customize the theme color, background music, and volume • Dark Mode support 【GREAT FOR】 • Interval training • Strength training • HIIT • Circuit training • Bodyweight workouts • Stretching • Yoga • Warm-ups • Core training Create your own routine once, and there’s no need to set it up again. Just open the app and jump straight into your regular workout. Your workout history is displayed in a calendar, making it easy to look back on the days you exercised and see how consistently you’ve kept going. Make your daily workouts simpler with an interval timer that works at your pace. 【PREMIUM FEATURES】 The Premium Plan includes the following features: • No banner or full-screen ads • Full theme color customization • Automatic data backup 【ABOUT THE PREMIUM PLAN】 • This is a monthly auto-renewing subscription. • If a free trial is available, the trial period will be shown on the purchase screen. • Please review the price and subscription period on the in-app purchase screen before subscribing. • Your Apple Account will be charged once the purchase is confirmed. • Your subscription renews automatically unless auto-renewal is turned off at least 24 hours before the end of the current subscription period. • To view or cancel your subscription, open Settings on your iPhone, tap your name, then tap Subscriptions. 【RESTORE PURCHASES】 If you switch to a new device, you can restore your purchased features by signing in with the same Apple Account used for the original purchase. In the app, go to Settings, then select Restore Premium Purchase. 【TERMS OF USE】 https://nilcraft.jp/terms?lang=en 【PRIVACY POLICY】 https://nilcraft.jp/privacy_policy?lang=en

About

FatBurn Watch

Features
Read full description

FatBurn Watch helps you stay in your fat-burn heart-rate zone during cardio workouts at the gym. Set your profile and target zone on iPhone, then start a workout on Apple Watch. When your heart rate stays above the upper limit, the Watch alerts you with haptics, sound, and an on-screen warning so you can ease back without staring at the screen. Key features - Start and stop workouts on Apple Watch - See real-time heart rate during a session - Estimate HRmax from age (Fox or Tanaka formula) - Personalize your zone with resting heart rate (Karvonen method) and measured HRmax from Health - Tune target zone (% of HRmax or Direct bpm) and alert sensitivity - Mute alerts for short breaks - Save workouts to HealthKit Privacy Heart-rate and workout data stay on device and in HealthKit. FatBurn Watch does not send this data to external servers, track you, show ads, or use third-party analytics. Important FatBurn Watch is not a medical device. It is a heart-rate feedback tool for workouts and is not intended to diagnose, treat, or prevent any medical condition. Consult a physician if you have health concerns.

Screenshots

Stretch Timer Interval HIIT4 screens
FatBurn Watch4 screens

Verdict

The call

The clearest difference is ads: FatBurn Watch at none against Stretch Timer Interval HIIT's shown. FatBurn Watch also leads on update cadence (weekly vs every 2 weeks). On price, in-app purchases, device support and iOS requirement 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. Stretch Timer Interval HIIT sells 2 in-app purchases, starting at $3.99 per month and FatBurn Watch sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Stretch Timer Interval HIIT ships an update every 2 weeks, FatBurn Watch weekly. Both last shipped on October 24, 2026.

Scorecard2 real differences · 8 level
Stretch Timer Interval HIIT versus FatBurn Watch: the parameters behind the verdict, then further details
ParameterStretch Timer Interval HIITFatBurn Watch
PriceFreeFree
Rating4.5 (2 ratings) — better—
Positive reviews75.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 2 weeksWeekly — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, Apple Watch
Requires iOS16.0 — better17.0
Further details — not scored
Size259 MB11 MB
Age rating4+4+
DeveloperNilCraft Inc.LFT Inc.

In-app purchases

2 purchases

Stretch Timer Interval HIIT

Subscriptions2
  • Premium Features14 Days trial$3.991 Month
  • Premium features$39.991 Year
1 purchases

FatBurn Watch

One-time1
  • Pro Unlock$3.99

Questions

Is Stretch Timer Interval HIIT free?
Stretch Timer Interval HIIT is free to download, with in-app purchases available.
Is FatBurn Watch free?
FatBurn Watch is free to download, with in-app purchases available.
Do Stretch Timer Interval HIIT or FatBurn Watch have ads?
Stretch Timer Interval HIIT shows ads; FatBurn Watch does not.
Which is updated more often, Stretch Timer Interval HIIT or FatBurn Watch?
Stretch Timer Interval HIIT ships an update every 2 weeks, and FatBurn Watch weekly. Most recently, Stretch Timer Interval HIIT was updated on October 24, 2026 and FatBurn Watch on October 24, 2026.

Other comparisons