# Challenger MK vs Functional Planet

The clearest difference is iOS requirement: Challenger MK at 13.4 against Functional Planet's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Challenger MK ships an update every 2 months, Functional Planet every 6 weeks. The most recent releases landed on June 24, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | Challenger MK | Functional Planet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/functional-planet/id6503668135/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 19 MB | 16 MB |
| Requires iOS | **13.4** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Grin It DOO](https://appshunter.io/developer/1500914276) | [Sasho Jadrovski](https://appshunter.io/developer/980019618) |

## What reviewers say

### Challenger MK

[App page](https://appshunter.io/ios/app/challenger-mk/id1500914277)

This free mobile app rewards you for walking or running. Earn points for every kilometer to get discount codes from local businesses. Join a community focused on positive societal change and track your activities using Apple Health.

**Highlights:** Earn rewards for walking/running, Redeem points for local business discounts, Participate in challenges, Join a positive community, Integrates with Apple Health

**In-app purchases:** none


### Functional Planet

[App page](https://appshunter.io/ios/app/functional-planet/id6503668135)

Schedule workouts, manage memberships, and track your progress with this functional training app. Earn rewards for your activity and reach your fitness goals.

**Highlights:** Schedule workouts, Manage memberships, Track training statistics, Earn rewards for activity, Book training sessions

**In-app purchases:** none


## Frequently asked questions

### Is Challenger MK free?

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

### Is Functional Planet free?

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

### Do Challenger MK or Functional Planet have ads?

Neither Challenger MK nor Functional Planet shows ads.

### Which is updated more often, Challenger MK or Functional Planet?

Challenger MK ships an update every 2 months, and Functional Planet every 6 weeks. Most recently, Challenger MK was updated on June 24, 2026 and Functional Planet on June 4, 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.*