Comparison

Challenges Aid 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

Challenges Aid

This app helps you track and achieve your monthly Apple Watch fitness challenges. It provides insights into your progress, offers reminders, and displays your achievements through a history tab and customizable widgets.

Highlights
  • Monthly challenge progress tracking
  • Historical achievement overview
  • Motivational messages
  • Home and Lock Screen widgets
  • Limited Edition Challenge tracking
  • Customizable reminders
Features
Read full description

Struggling to complete your Apple Watch challenges each month? Let us aid you! With Challenges Aid you will get easier and better insights into your progress this month. You can be reminded on the first day of each month to set your new challenges and with the History tab you will build a great overview of your achievements through the years. Small motivational messages will keep you going and inform you how you are doing. And with both Lock Screen and Homescreen widgets you always have your progress right at hand! Challenges Aid gets your data from Apple Health and only requires read access. The Apple Watch challenges cannot be read from your Health app or the Watch, those must be set manually each month. A reminder will help you do that. ThisMonth Overview * Get a clear view on today's progress * Get an overview of this month's challenge and progress * Get an overview of how much time has passed in the month * See day by day whether or not you achieved that day's goal or reached the required average Limited Edition Challenges* * Track the current, upcoming and previous Limited Edition Challenges * Get a clear view on the current challenges * Look back which challenges you’ve achieved and which you didn’t * More details to come later History* * Add previous challenges and see at a glance which ones you achieved * Open a challenge to see more details Settings * Toggle motivational messages on or off * Choose between distances in kilometers or miles * Toggle the monthly reminder on or off and set a time* * Toggle the monthly summary on or off and let it be auto saved * Subscribe to Limited Edition Notifications to never miss one* With companion Apple Watch App (work in progress). Widgets for your iPhone's Home and Lock Screen and Apple Watch complications! Challenges Aid Plus: * Get access to Limited Edition Challenges * Get your full History instead of the past 12 months * Set reminders and notifications * More widgets (coming soon) * Deeper insights (coming soon) Standard Apple Terms of Use (EULA) applies: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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

Challenges Aid4 screens
Interval Flow4 screens

Verdict

The call

The clearest difference is rating: Interval Flow at 4.7 against Challenges Aid's 4.1. Interval Flow also leads on review sentiment (48% vs 30%) and ratings volume (168 vs 7). Challenges Aid's advantage is monetization model (freemium vs subscription). On price, update cadence, ads and in-app purchases 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. Challenges Aid sells 3 in-app purchases, starting at $0.99 per month 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 4.1. That said, the two scores are not equally well evidenced: Interval Flow has 168 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 30% of Challenges Aid's written reviews are positive against 48% of Interval Flow's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 1, 2026 and October 6, 2026 respectively.

Scorecard4 real differences · 6 level
Challenges Aid versus Interval Flow: the parameters behind the verdict, then further details
ParameterChallenges AidInterval Flow
PriceFreeFree
Rating4.1 (7 ratings)4.7 (168 ratings) — better
Positive reviews30.0% of reviews48.1% of reviews — better
Number of ratings7168 — better
Update frequencyFortnightlyFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium — betterSubscription
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS17.0 — better18.6
Further details — not scored
Size8 MB20 MB
Age rating4+4+
DeveloperTim HilkerBence Kaposzta

Customer experience

Challenges Aid

All ratings7 ratings
Positive71.4%
Neutral28.6%
Negative0.0%
Written reviews10 reviews
Positive30.0%
Neutral20.0%
Negative50.0%

Interval Flow

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

Bugs and requests

Challenges Aid

Not enough reviews yet to summarise bugs or requests.

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

3 purchases

Challenges Aid

Subscriptions2
  • Plus Monthly7 Days trial$0.991 Month
  • Plus Yearly$9.991 Year
One-time1
  • Plus Lifetime$29.99
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 Challenges Aid free?
Challenges Aid 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, Challenges Aid or Interval Flow?
Interval Flow is rated higher. Challenges Aid averages 4.1 out of 5 from 7 ratings, while Interval Flow averages 4.7 from 168 ratings.
Do Challenges Aid or Interval Flow have ads?
Neither Challenges Aid nor Interval Flow shows ads.
Which is updated more often, Challenges Aid or Interval Flow?
Challenges Aid ships an update fortnightly, and Interval Flow fortnightly. Most recently, Challenges Aid was updated on October 1, 2026 and Interval Flow on October 6, 2026.

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