# SIGMA LINK vs ROTOR Power

SIGMA LINK and ROTOR Power are too close to call on the numbers: across 8 compared parameters — price, review sentiment, update cadence and ads among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

SIGMA LINK ships an update every 4 months, ROTOR Power every 5 months. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SIGMA LINK | ROTOR Power |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.5 (8 ratings)](https://appshunter.io/ios/app/sigma-link/id1147984544/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 9.0% of reviews | **9.1% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 5 months |
| Monetization | Free | Free |
| Size | 76 MB | 31 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SIGMA-ELEKTRO GmbH](https://appshunter.io/developer/803939887) | [ROTOR Bike Components](https://appshunter.io/developer/1210670819) |

## What reviewers say

### SIGMA LINK

[App page](https://appshunter.io/ios/app/sigma-link/id1147984544)

Easily transfer training data from compatible devices to your smartphone. View personal bests, statistics, and completed tracks. Sync all your training data, workouts, and sport profiles with cloud integration for constant access.

**Highlights:** Transfer training units, View training statistics, Track personal bests, Manage device settings, Sync with SIGMA CLOUD, Access workouts and sport profiles

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is SIGMA LINK free?

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

### Is ROTOR Power free?

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

### Do SIGMA LINK or ROTOR Power have ads?

Neither SIGMA LINK nor ROTOR Power shows ads.

### Which is updated more often, SIGMA LINK or ROTOR Power?

SIGMA LINK ships an update every 4 months, and ROTOR Power every 5 months. Most recently, SIGMA LINK was updated on October 20, 2026 and ROTOR Power on October 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.*