# Plank Challenge vs K

The clearest difference is update cadence: K at daily against Plank Challenge's every 3 months. K also leads on iOS requirement (16.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Plank Challenge sells 1 one-off in-app purchase and K sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Plank Challenge ships an update every 3 months, K daily. The most recent releases landed on October 19, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Plank Challenge | K |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Daily** |
| Monetization | — | Free with in-app purchases |
| Size | 5 MB | 47 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [AppConsult](https://appshunter.io/developer/1818576565) | [HOEHYUN JUNG](https://appshunter.io/developer/633373915) |

## What reviewers say

### Plank Challenge

[App page](https://appshunter.io/ios/app/plank-challenge-30-days/id6746803064)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Planking Pro | $4.99 | one-time |


### K

[App page](https://appshunter.io/ios/app/k-pushy/id6771961144)

This app uses your phone's camera to automatically count your push-ups, eliminating the need for manual tracking. Choose from various AI coaches with distinct personalities to motivate your workouts and transform your fitness routine.

**Highlights:** Smart auto-counting via front camera, Personalized fitness plan, 8 unique AI coaches, Shareable workout cards, Habit tracking with calendar stamps

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pushy Premium | $2.99 | one-time |


## Frequently asked questions

### Is Plank Challenge free?

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

### Is K free?

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

### Do Plank Challenge or K have ads?

Neither Plank Challenge nor K shows ads.

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

Plank Challenge ships an update every 3 months, and K daily. Most recently, Plank Challenge was updated on October 19, 2026 and K on October 8, 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.*