# ROTOR Power vs Aster

The clearest difference is in-app purchases: ROTOR Power at none against Aster's 5. ROTOR Power also leads on iOS requirement (13.0 vs 15.0). Aster's advantage is update cadence (every 3 weeks vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. Aster sells 5 in-app purchases, starting at $2.99 per month. ROTOR Power asks for nothing beyond the download.

ROTOR Power ships an update every 5 months, Aster every 3 weeks. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | ROTOR Power | Aster |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 9.1% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 31 MB | 17 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [ROTOR Bike Components](https://appshunter.io/developer/1210670819) | [James Vickers](https://appshunter.io/developer/1895822299) |

## What reviewers say

### ROTOR Power

[App page](https://appshunter.io/ios/app/rotor-power/id1216141058)

This app helps cyclists optimize their performance by updating power meter firmware, checking device battery, and analyzing pedaling biomechanics. It provides real-time training data, workout history, and syncs with popular third-party fitness platforms.

**Highlights:** Firmware updates, Device battery check, Pedaling biomechanics analysis (TORQUE 360, OCA, OCP), Real-time power and cadence metrics, Workout history and .fit export, Bluetooth connectivity, Third-party app syncing (Strava, Training Peaks)

**Features:** macOS Compatibility

**In-app purchases:** none


### Aster

[App page](https://appshunter.io/ios/app/aster-live-track/id6764533612)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Aster Plus - Monthly | $2.99 | per month |
| Aster Plus - Annual | $24.99 | per year |
| Aster Organiser 100 - Monthly | $79.99 | per month |
| Aster Organiser 500 - Monthly | $149.99 | per month |
| Aster Organiser 1000 - Monthly | $199.99 | per month |


## Frequently asked questions

### Is ROTOR Power free?

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

### Is Aster free?

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

### Do ROTOR Power or Aster have ads?

Neither ROTOR Power nor Aster shows ads.

### Which is updated more often, ROTOR Power or Aster?

ROTOR Power ships an update every 5 months, and Aster every 3 weeks. Most recently, ROTOR Power was updated on November 2, 2026 and Aster on November 5, 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.*