Comparison

Stretch Timer Interval HIIT vs NatureVoice(BGM For Sleep)

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
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【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

NatureVoice(BGM For Sleep)

Features
Read full description

NatureVoice – High-Resolution Nature Sound BGM Pure nature, zero distractions. No ads. No internet. Just the highest-quality natural sound experience. 【Recommended: Use Headphones】 NatureVoice is a high-resolution ambient sound app designed to deliver the purest natural sound your device can reproduce. Whether it’s the rustle of trees, the patter of rain, or the gentle flow of a river — every sound is captured with lifelike clarity. Put on your headphones and you’ll feel as if nature itself unfolds right before you. 【Features】 Completely Offline – Enjoy authentic nature sounds anytime, anywhere. No Ads, No Purchases – Immerse yourself without interruptions. Simple & Intuitive – Easy for anyone to use, from kids to seniors. High-Resolution Audio – Experience the highest sound quality your device can provide. 【Included Sounds】 Forest: The whisper of leaves and songs of birds blending in harmony. River: A gentle stream that calms the mind and resets your rhythm. Rain: Soft raindrops against the window, washing away distractions. Waterfall: The powerful rush of falling water that energizes focus. Storm: The vibrant energy of rain and wind — nature in motion. 【Perfect For】 Finding peace and relaxation Meditation, yoga, or mindfulness sessions Taking a quiet break from work or study 【Bring Nature With You】 No network. No ads. Just pure, high-resolution sound that transforms your space into a serene natural world — right from your smartphone. Experience the stillness and beauty of nature, wherever you are. Listen on YouTube: https://www.youtube.com/@SceneVoice

Screenshots

Stretch Timer Interval HIIT4 screens
NatureVoice(BGM For Sleep)4 screens

Verdict

The call

The clearest difference is price: Stretch Timer Interval HIIT at Free against NatureVoice(BGM For Sleep)'s $0.99. NatureVoice(BGM For Sleep)'s advantage is in-app purchases (none vs 2) and ads (none vs shown). On 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

Stretch Timer Interval HIIT is free to download; NatureVoice(BGM For Sleep) costs $0.99 up front. Stretch Timer Interval HIIT sells 2 in-app purchases, starting at $3.99 per month. NatureVoice(BGM For Sleep) asks for nothing beyond the download.

UpkeepUpdate frequency

Stretch Timer Interval HIIT ships an update every 2 weeks, NatureVoice(BGM For Sleep) every 8 days. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.

Scorecard4 real differences · 6 level
Stretch Timer Interval HIIT versus NatureVoice(BGM For Sleep): the parameters behind the verdict, then further details
ParameterStretch Timer Interval HIITNatureVoice(BGM For Sleep)
PriceFree — better$0.99
Rating4.5 (2 ratings) — better—
Positive reviews75.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 2 weeksEvery 8 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better16.6
Further details — not scored
Size259 MB162 MB
Age rating4+4+
DeveloperNilCraft Inc.SINN MIRAI, K.K.

In-app purchases

2 purchases

Stretch Timer Interval HIIT

Subscriptions2
  • Premium Features14 Days trial$3.991 Month
  • Premium features$39.991 Year
None

NatureVoice(BGM For Sleep)

No in-app purchases

Questions

Is Stretch Timer Interval HIIT free?
Stretch Timer Interval HIIT is free to download, with in-app purchases available.
Is NatureVoice(BGM For Sleep) free?
NatureVoice(BGM For Sleep) costs $0.99, with no in-app purchases.
Do Stretch Timer Interval HIIT or NatureVoice(BGM For Sleep) have ads?
Stretch Timer Interval HIIT shows ads; NatureVoice(BGM For Sleep) does not.
Which is updated more often, Stretch Timer Interval HIIT or NatureVoice(BGM For Sleep)?
Stretch Timer Interval HIIT ships an update every 2 weeks, and NatureVoice(BGM For Sleep) every 8 days. Most recently, Stretch Timer Interval HIIT was updated on October 24, 2026 and NatureVoice(BGM For Sleep) on October 11, 2026.

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