Comparison

Strongify vs Interval Flow

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

Head to head
About

Strongify

Easily log your weightlifting sessions by recording reps and weight lifted. Customize exercises and routines, then track your progress over time with motivating charts and a workout calendar. Share your achievements on social media.

Highlights
  • Log reps and weight in few taps
  • Create custom routines and exercises
  • Track progress with charts
  • Workout calendar view
  • Share workouts on social media
  • Support for time-based exercises
Features
Read full description

Meet Strongify, the easiest workout tracker app. Enter the number of reps and the weight you lifted in just a few taps. Create any exercise and track your progress over time. Set up now the gym routine you deserve. EASY You can name your routines and exercises as you want. Don't spend that much time trying to find the official (long and boring) name of your workout in an endless list of exercises. Create a routine, create an exercise in it, and you are ready to go! You know what needs to be done for your body, and an app shouldn't make it difficult FAST Tracking your progress should be fast. In fact, Strongify does it in a few taps only! Are you going to the gym to look at your workout app? We don't think so! That's why Strongify will remember the last weight and reps you entered, which makes adding a workout fast and convenient. Focus on the gains; we take care of the rest. STAY MOTIVATED Check your progress over time with our charts. Nothing is more motivating than seeing your own improvement. Every time you go to the gym, you will know how well you performed last time. Outperform yourself week after week. SHARE YOUR SUCCESSES Share your workout with your social networks. You can also directly add them to your Instagram Story! We think you should be proud of what you accomplish (especially if you broke your previous bench press max weight). Share that with style with our different cards: - Total volume lifted - Best set - Progress over time - Reps Only - Duration TIME-BASED EXERCISES You can also track your planks, stretching exercises, or yoga sessions. CALENDAR Another way to get motivated is to see how often you've worked out this week or month. We included a calendar that shows exactly that. You can quickly overview your past workouts and see exactly what exercises you performed on a specific day. THEMES Everyone has different tastes, we are totally fine if you don't like the default theme. That's why we included others. Prefer pink? Maybe black? We've got you covered! APP FEATURES: - Easy and simple UI - Fast, no more wasted time at the gym - Efficient tracking of your workout - Log your reps and weight in a few taps. - Create any custom routines you want - Support for imperial and metric units - Track your progress - Get relevant stats on your progress - Multiple charts - Reach your fitness goals - Analyze your performance - Share your workout on your Instagram Story - See all your past workouts on a calendar - Try themes before trying the Premium version - Get your dream body A note from the developer: I could never remember how much weight I lifted during my previous workouts. I wanted an easy way to track my workouts without spending too much time on it. I tried to create a simple, yet effective way to track my progress without bloating the app with useless features; I hope you like it! Feel free to consult our privacy policy here: https://astrochimp.framer.website/privacy and our terms of use here: https://astrochimp.framer.website/terms Keep it Strong!

About

Interval Flow

This app revolutionizes fitness routines with deep customization and advanced tracking for various activities like HIIT, Yoga, and CrossFit. It allows users to create, share, and follow personalized workouts with features like color-coded intervals, real-time progress tracking, and voice assistance.

Highlights
  • Color-coded intervals
  • Customizable circuits
  • Real-time progress tracking
  • Voice assist and search
  • Exercise library
  • Workout sharing
Features
Read full description

Interval Flow: Experience a Workout Revolution Interval Flow is your ultimate fitness companion, designed to transform your workout experience with deep customization and advanced tracking. This versatile app is perfect for a wide range of activities including HIIT, TABATA, CrossFit, Yoga, Pilates, Meditation, and more. With Interval Flow, you can stay focused on your fitness goals while the app handles the details. Key Features: - Color-Coded Intervals: Customize your workout visually with color-coded intervals. Set distinct colors for warm-ups, high-intensity bursts, rest periods, and more, to easily navigate through your routine. - Exercise Library: Build your workouts with ease! Add new exercises or select from the existing ones to tailor your workout to your specific needs. - Real-Time Progress Tracking: Keep a live tab on your workout progress. The dynamic interval list updates in real-time, ensuring you know exactly where you are in your routine. - Customizable Circuits: Create the perfect workout sequence by arranging various exercises into repeatable circuits tailored to your fitness level and goals. - Personalized Interval Warnings: Get timely alerts before an interval ends. Customize the warning sounds to suit your style, ensuring smooth transitions without missing a beat. - Interactive Workflow: Enjoy crafting your workouts with a user-friendly interface that’s as intuitive as it is functional. Setting up your ideal workout regime is now as engaging as the workout itself. - Voice Assist: Let our advanced voice assist guide you through your exercises, announcing what’s next so you can remain focused on your form and intensity. - Voice Search: Quickly find your favorite workouts using voice commands, making your preparation seamless and hands-free. - AirShare: Share your custom workouts with friends or clients effortlessly using AirDrop, enhancing connectivity and interaction. Why Choose Interval Flow? With Interval Flow, you don't just exercise, you experience a revolution in workout efficiency and enjoyment. The app’s intuitive interface and comprehensive customization options make it the optimal companion for anyone serious about fitness. Whether you're powering through a high-intensity session or seeking tranquility in yoga, Interval Flow adapts to your pace and preference. Unlock your potential with Interval Flow – where your workout meets innovation. Interval Flow Subscription: The app includes a 1 month long auto-renewable subscription with a 3-day free trial, which will unlock premium features, like unlimited workouts, timer program editing and autoplay and costs $4.99/ month. It will be charged to your credit card through your iTunes account and will automatically renew unless you canceled at least 24 hours before the end of the current period. Any unused portion of a free trial period will be forfeited when you purchase the subscription. Though your subscription for the current month cannot be canceled, you can turn auto-renewal off in your account settings after purchase. See the instructions here: https://support.apple.com/en-us/HT202039 You can read the terms of use and privacy policy here: https://kapi90.github.io/hiit_timer_privacy_policy.html End User License Agreement (EULA) of the App Store applies: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Strongify4 screens
Interval Flow4 screens

Verdict

The call

The clearest difference is monetization model: Strongify at free with in-app purchases against Interval Flow's subscription. Strongify also leads on review sentiment (72% vs 48%). Interval Flow's advantage is rating (4.7 vs 4.5). On price, ratings volume, update cadence and ads 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. Strongify sells 6 in-app purchases, starting at $4.99 per 7 days and Interval Flow sells 10 in-app purchases, starting at $4.99 per 3 months. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Interval Flow holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 280 and 168 respectively. Written reviews complicate that: 72% of Strongify's written reviews are positive against 48% of Interval Flow's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Strongify ships an update every 8 days, Interval Flow fortnightly. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

Scorecard3 real differences · 7 level
Strongify versus Interval Flow: the parameters behind the verdict, then further details
ParameterStrongifyInterval Flow
PriceFreeFree
Rating4.5 (280 ratings)4.7 (168 ratings) — better
Positive reviews71.7% of reviews — better48.1% of reviews
Number of ratings280 — better168
Update frequencyEvery 8 days — betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterSubscription
DevicesiPhone, Apple WatchiPhone, iPad
Requires iOS17.0 — better18.6
Further details — not scored
Size34 MB20 MB
Age rating4+4+
DeveloperAstrochimp SRLBence Kaposzta

Customer experience

Strongify

All ratings278 ratings
Positive86.3%
Neutral5.4%
Negative8.3%
Written reviews247 reviews
Positive71.7%
Neutral13.0%
Negative15.4%

Interval Flow

All ratings168 ratings
Positive93.5%
Neutral2.4%
Negative4.2%
Written reviews27 reviews
Positive48.1%
Neutral18.5%
Negative33.3%

User reviews

Strongify

From 280 App Store ratings

What we love

  • 👍 Simple and easy to use
  • 🚀 Smooth and clean interface
  • 💡 Customizable workouts
  • 👍 Helpful for tracking progress
  • 👍 Great for basic workout tracking needs

Room to improve

  • 🐛 Bugs causing data loss after updates
  • 🔍 Lack of advanced features (e.g., notes, folders, custom exercise library)
  • 🔍 Limited data visualization and reporting
  • 🔍 Inability to change measurement units within the app

Interval Flow

From 168 App Store ratings

What we love

  • 👍 Nicely designed with good features
  • 👍 Unique and brilliantly for keeping fit
  • 👍 Simplicity gets it done

Room to improve

  • 🐛 App crashes on launch
  • 🐛 App doesn't remember interval settings
  • 🐛 App rearranges workout order
  • 🐛 Cannot see questionnaire properly
  • 🐛 Robot voice with no visual instructions

Bugs and requests

Strongify

Reported bugs

4 issues
  • Workout data getting deleted after updates
  • Scrolling issues and screen freezes
  • Inconsistent Apple Watch integration
  • Incorrect workout data display

Requested features

6 requests
  • Add ability to pre-plan workouts
  • Implement dark mode
  • Improve Apple Watch integration
  • Add notes section for each exercise
  • Allow rearranging and organizing of exercises
Show 1 more
  • Provide more comprehensive data tracking and visualization

Interval Flow

Reported bugs

10 issues
  • Programs deleted after update
  • App crashes when adding a program
  • Show/Hide Instructions adds time to interval
  • App defaults to unused workout
  • Cannot permanently skip to end of timed activity
Show 5 more
  • Intervals revert to previous settings
  • App won't remember order of custom circuit interval programs
  • Blank screen after download
  • Cannot get program to open
  • Cannot see bottom of screen on questionnaire

Requested features

5 requests
  • Increase repetitions to 20
  • Streamline adding intervals
  • Make it possible to hide unused workouts
  • Add music integration or option
  • Provide visual instructions for moves

In-app purchases

6 purchases

Strongify

Subscriptions4
  • Strongify Weekly Plan3 Days trial$4.997 Days
  • Strongify Premium One Month$7.991 Month
  • Strongify Annual Plan$24.991 Year
Show 1 more
  • Strongify Premium One Year7 Days trial$29.991 Year
One-time2
  • Strongify Premium$8.99
  • Lifetime Premium$49.99
10 purchases

Interval Flow

Subscriptions8
  • 3 Month$4.993 Months
  • 1 Month$9.991 Month
  • 1 Month, 3 day trial3 Days trial$9.991 Month
Show 5 more
  • Annual7 Days trial$14.991 Year
  • 1 Year discounted$25.951 Year
  • 1 Year, 3 day trial3 Days trial$39.991 Year
  • 1 Year$39.991 Year
  • 1 Year Intro month1 Month trial$39.991 Year
One-time2
  • Free Lifetime subscriptionFree
  • Lifetime$24.99

Questions

Is Strongify free?
Strongify is free to download, with in-app purchases available.
Is Interval Flow free?
Interval Flow is free to download, with in-app purchases available.
Which has better reviews, Strongify or Interval Flow?
Interval Flow is rated higher. Strongify averages 4.5 out of 5 from 280 ratings, while Interval Flow averages 4.7 from 168 ratings.
Do Strongify or Interval Flow have ads?
Neither Strongify nor Interval Flow shows ads.
Which is updated more often, Strongify or Interval Flow?
Strongify ships an update every 8 days, and Interval Flow fortnightly. Most recently, Strongify was updated on October 5, 2026 and Interval Flow on October 2, 2026.

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