# eMaxMobileApp vs Boulder Challenger

The clearest difference is price: Boulder Challenger at Free against eMaxMobileApp's $0.99. Boulder Challenger also leads on update cadence (every 6 days vs every 3 weeks). eMaxMobileApp's advantage is chart position (#28 vs unranked) and device support (3 vs 1). On ads and in-app purchases there is nothing between them.

Boulder Challenger is free to download; eMaxMobileApp costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

eMaxMobileApp ships an update every 3 weeks, Boulder Challenger every 6 days. The most recent releases landed on October 22, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | eMaxMobileApp | Boulder Challenger |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.5 (15 ratings)](https://appshunter.io/ios/app/emaxmobileapp/id1460664010/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | 92.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | Free | — |
| Best chart rank | **#28** | — |
| Size | 5 MB | 21 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Markus Schlegel](https://appshunter.io/developer/1460664009) | [Marcel Rieger](https://appshunter.io/developer/6811019481) |

## What reviewers say

### eMaxMobileApp

[App page](https://appshunter.io/ios/app/emaxmobileapp/id1460664010)

**Currently charting:** #28 Top Paid · Sports (US App Store)

This app enhances the performance of compatible electric bicycle systems. It supports a wide range of displays and drive units, offering advanced optimization features. Users can find detailed compatibility information and tuning possibilities on the developer's website.

**Highlights:** Optimizes STePS systems, Supports Bluetooth displays, Compatible with various drive units, Works with Shimano motor firmware, Advanced tuning possibilities

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

**In-app purchases:** none


### Boulder Challenger

[App page](https://appshunter.io/ios/app/boulder-challenger/id6811019479)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is eMaxMobileApp free?

eMaxMobileApp costs $0.99, with no in-app purchases.

### Is Boulder Challenger free?

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

### Do eMaxMobileApp or Boulder Challenger have ads?

Neither eMaxMobileApp nor Boulder Challenger shows ads.

### Which is updated more often, eMaxMobileApp or Boulder Challenger?

eMaxMobileApp ships an update every 3 weeks, and Boulder Challenger every 6 days. Most recently, eMaxMobileApp was updated on October 22, 2026 and Boulder Challenger on October 9, 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.*