# Plank Challenge vs RepStack

The clearest difference is in-app purchases: RepStack at none against Plank Challenge's 1. RepStack also leads on ads (none vs shown) and update cadence (daily vs every 3 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Plank Challenge sells 1 one-off in-app purchase. RepStack asks for nothing beyond the download.

Plank Challenge ships an update every 3 weeks, RepStack daily. The most recent releases landed on October 8, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Plank Challenge | RepStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (468 ratings)](https://appshunter.io/ios/app/plank-challenge-core-workout/id1083360252/reviews)** | — |
| Number of ratings | **468** | — |
| Positive reviews | 68.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 17 MB | 40 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Bo Kalvslund](https://appshunter.io/developer/572272193) | [ALEXANDER HINTERLEITNER](https://appshunter.io/developer/1882835373) |

## What reviewers say

### Plank Challenge

[App page](https://appshunter.io/ios/app/plank-challenge-core-workout/id1083360252)

This app guides you through a 5-week program to build up to a 4-minute plank. It requires no equipment and can be done in just 4 minutes daily, with rest days incorporated for recovery. It also includes a bonus push-up progression.

**Highlights:** 5-week structured plank program, Progressive push-up training, Daily workout instructions, Progress tracking, Apple Music integration, Distraction-free interface

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plank Challenge Pro | $0.99 | one-time |

**What reviewers like**

- 👍 Simple and effective
- 💪 Great for plank challenges
- 🎯 Helps build stamina
- ✅ Good for beginners
- ✨ Straightforward design

**What reviewers complain about**

- 🔇 Music pauses during sets
- 🎵 Lack of in-app music/motivation
- ❓ No clear guidance on plank types
- 🎛️ No timer customization
- 👎 Push-up part lacks challenge

**Reported bugs**

- App crashes after iOS 13 update
- No times displayed after iOS 13 update
- Audio mutes automatically between active and rest
- App not running after iOS 13 update

**Requested features**

- Allow self-designed workouts
- Integrate reminders
- Add in-app music or motivational sounds
- Provide explanation on different plank types
- Include countdowns and motivational cues


### RepStack

[App page](https://appshunter.io/ios/app/repstack/id6760138812)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Plank Challenge free?

Plank Challenge is free to download, with in-app purchases available.

### Is RepStack free?

RepStack is free to download, with no in-app purchases.

### Do Plank Challenge or RepStack have ads?

Plank Challenge shows ads; RepStack does not.

### Which is updated more often, Plank Challenge or RepStack?

Plank Challenge ships an update every 3 weeks, and RepStack daily. Most recently, Plank Challenge was updated on October 8, 2026 and RepStack on September 24, 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.*