# Challenges Aid vs Interval Flow

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.

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.

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.

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

## The numbers

| Metric | Challenges Aid | Interval Flow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (7 ratings)](https://appshunter.io/ios/app/challenges-aid/id6443764002/reviews) | **[4.7 (168 ratings)](https://appshunter.io/ios/app/interval-flow-wod-timer/id6444124987/reviews)** |
| Number of ratings | 7 | **168** |
| Positive reviews | 30.0% of reviews | **48.1% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | **Freemium** | Subscription |
| Size | 8 MB | 20 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Tim Hilker](https://appshunter.io/developer/1473865123) | [Bence Kaposzta](https://appshunter.io/developer/1650069302) |

## What reviewers say

### Challenges Aid

[App page](https://appshunter.io/ios/app/challenges-aid/id6443764002)

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:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $0.99 | per month |
| Plus Yearly | $9.99 | per year |
| Plus Lifetime | $29.99 | one-time |


### Interval Flow

[App page](https://appshunter.io/ios/app/interval-flow-wod-timer/id6444124987)

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:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 Month | $4.99 | per 3 months |
| 1 Month | $9.99 | per month |
| 1 Month, 3 day trial | $9.99 | per month |
| Annual | $14.99 | per year |
| 1 Year discounted | $25.95 | per year |
| 1 Year, 3 day trial | $39.99 | per year |
| 1 Year | $39.99 | per year |
| 1 Year Intro month | $39.99 | per year |
| Free Lifetime subscription | Free | one-time |
| Lifetime | $24.99 | one-time |

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

- 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

**Requested features**

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


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*