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79
BU Score
Strong

Interval Timer ++

4.8 ✍️ Editor
✍️ BU Analytics Review

Interval Timer ++ is an iOS app from Sunny Studio in the Health & Fitness category, currently rated 4.8★ across 14,714 ratings. Initial signal reads as mixed reviews — supporters praise core features while critics cite stability/value gaps.

Our BU Score puts it at 79Strong (healthy traction). For a Health & Fitness app, that means healthy traction.

Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.

creator

📊 Performance Tracking LIVE

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idle
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Rating
Reviews
Forecast Revenue / mo
Snapshots tracked
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Range:

💰 Forecast Revenue / mo

MODEL
Revenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 9 of 9 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
Mid install base (14,714 ratings)METRIC
+$5,500
Excellent rating (4.8★)METRIC
+$2,200
bugsREVIEW
−$1,800
5 starREVIEW
+$1,800
great valueREVIEW
+$1,600
excellent appREVIEW
+$1,500
Mature app (8y old)METRIC
+$1,500
highly recommendREVIEW
+$1,400
Ad-supported / freemiumMETRIC
+$600
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)

📈 Reviews Growth

LIVE
Cumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
Jul 24
Aug 24
Sep 24
Oct 24
Nov 24
Dec 24
Jan 25
Feb 25
Mar 25
Apr 25
May 25
Oct 25

⭐ Rating Trend

LIVE
Average rating evolution. Updates with each new review batch.

🗓️ Snapshot Timeline

HISTORY
Each bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →
💾 87 MB🔞 4+📱 iOS 12.0+🔖 v4.3.3🔄 updated 4y ago🌐 EN, DE, ZH📂 Health & Fitness💰 Paid🚀 Launched 2017 (8y old)

📝 About this app

Award-winning app for your daily workouts! Simple set up, intense workout:
*** One touch to set up Workout, Rest, and Repeat.
*** Supports both iPhone and Apple Watch
*** Colorful design, to give you some eye candy while working hard
*** Multiple timers for easy access and training
*** Premium timers where different fitness types are mixed
*** Background notification, so you can keep working out while browsing other apps, or even when screen is locked
*** Listen to your favorite music while working out
*** See your workout history in calendar view

Health App Integration
We integrate with the health app (HealthKit) to read and track your steps data and show them in a beautiful way.

Feature details:
- Workout duration: 2 seconds to 8 minutes
- Rest duration: 0 seconds to 8 minutes
- Repeat: 20 times (50 times if purchased Premium Subscription)
- Premium timers: mix fitness types, including Planks, Jumping Jack, Push Ups, Sit Ups, High Knees, Side Planks, Butt Kicks, Side Lunges, Lunges, etc.
- Multiple timers for quick access
- Name your timers
- Swipe-to-delete timers
- Drag-n-drop to reorder custom timers
- 10 seconds count down, so you can get into workout position
- Count down sound before next workout starts, for you to recover position
- Pause and resume workout at any time
- Reset at any time if workout was interrupted
- Calendar view: shows your work/rest/repeat sessions
- Listen to your favorite music in background, while working out the Interval Timer in foreground
- Background music will be tuned down when playing workout sounds
- Vibration / Haptic feedbacks between workout and rest
- Ability to mute all workout sound

Users say good works after usage:
"I love the simplicity and ease of use of this app. It is almost exactly what I am looking for."
"No frills or gimmicks, this app gives it to you straight, which is how interval timers should work IMO."
"An eye-candy for your tough workouts."
"Mind-blowing on how easy it is to use."
"Simple. Does EXACTLY what you need."

Also checkout our awesome demo video on Youtube:
https://www.youtube.com/watch?v=gO_z8mN1asU

Interval Timer Pro (In App Purchase):
- Create unlimited number of timers for easy access
- Use our premium timers
- Repeat workout for more than 20 times

• You can subscribe for Interval Timer Pro inside the app; subscriptions are billed monthly or annually at the rate selected depending on the subscription plan.
• Alternatively a one-time payment plan is available (this is not a subscription).
• Payment will be charged to your iTunes account at confirmation of purchase.
• Subscriptions will automatically renew unless auto-renew is cancelled at least 24 hours before the end of current period.
• Your account will be charged according to your plan for renewal within 24 hours prior to the end of the current period.
• You can manage or turn off auto-renew in your Apple ID account settings at any time after purchase.
• To manage your subscriptions or turn off auto-renewal:
- Go to Settings > iTunes & App Store
- Tap your Apple ID at the top of the screen
- Tap View Apple ID. You might need to sign in or use Touch ID.
- Tap Subscriptions.
- Tap the subscription you want to manage.
- Use the options to manage your subscription.
• No cancellation of the current subscription is allowed during the active subscription period. Once purchased, refunds will not be provided for any unused portion of the term.
We take the security of our customers very seriously.
Read our Terms of Service at
https://sunnystudio.wordpress.com/2018/08/03/interval-timer-terms-of-us/
and our Privacy Policy at
https://sunnystudio.wordpress.com/2018/07/31/interval-timer-privacy-policy/

Attributions:
Lock by Maxim Kulikov from the Noun Project
Premium by Gregor Cresnar from the Noun Project

🆕 What's New · v4.3.3

Simple & Powerful workout timer for HIIT and Tabata.
- Automatically sync the workouts data from Watch app with the Interval Timer app

Profile & Insights

Everything we know — and don't — about this app and its company.

Identification

App name
Interval Timer ++
Developer
Sunny Studio
Bundle ID
com.sunnystudio.workouttimer
App Store URL
Open in App Store
Category
Health & Fitness
Content rating
4+
Languages
EN, DE, ZH

Company

Website
Not found
Tagline
Today
Description
Find apps and games for iPhone, iPad, Mac, and more on the App Store.
Founded
Not found
HQ / Address
Not found
Employees
Not found
Logo
OG image

Revenue

Verified revenue / mo
Not found
AI revenue estimate / mo
Not found
AI annual estimate
Not found
ML model estimate / mo
$25.9K/mo
Top-grossing rank
Outside top 100 in US Health & Fitness
All-time revenue
Not found
Pricing
Not found

Founder

Name
Not found
X / Twitter
Not found
LinkedIn
Not found
GitHub
Not found
X followers
Not found
Public statements
Not found

Funding

Total raised
Not found
Last round
Not found
Investors
Not found
Crunchbase
Not found
AngelList
Not found

Press & Links

Articles found
Not found
Listed on
Not found
Blog
https://apps.apple.com/us/app/letterloop-group-newsletters/id6468623700
Press / News
Not found

Contacts & Socials

Socials
Not found
Email
Not found
Phone
Not found
Contact page
Not found
About page
https://apps.apple.com/us/iphone/story/id1895675718
📈Ratings growth14,714 ratings+39% lifetimeShow 3-year history estimate ▾May 2023May 2024May 2026
Tracked (58 weeks) Pre-tracking estimate (34 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
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