# SIGMA LINK vs E

The clearest difference is rating: E at 1.8 against SIGMA LINK's 1.5. E also leads on review sentiment (22% vs 9%) and ratings volume (74 vs 8). SIGMA LINK's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 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.

E holds the better App Store score, 1.8 against 1.5. That said, the two scores are not equally well evidenced: E has 74 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 9% of SIGMA LINK's written reviews are positive against 22% of E's.

SIGMA LINK ships an update every 4 months, E every 3 months. The most recent releases landed on August 12, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | SIGMA LINK | E |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.5 (8 ratings)](https://appshunter.io/ios/app/sigma-link/id1147984544/reviews) | **[1.8 (74 ratings)](https://appshunter.io/ios/app/e-tube-project-cyclist/id1176407871/reviews)** |
| Number of ratings | 8 | **74** |
| Positive reviews | 9.0% of reviews | **21.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 76 MB | 159 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [SIGMA-ELEKTRO GmbH](https://appshunter.io/developer/803939887) | [SHIMANO.INC](https://appshunter.io/developer/852768780) |

## 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


### E

[App page](https://appshunter.io/ios/app/e-tube-project-cyclist/id1176407871)

Customize your e-bike's performance and update its firmware. Adjust assist power, fine-tune automatic shifting for trails or city riding, and personalize your ride.

**Highlights:** Update firmware, Customize e-bike assist power, Adjust AUTO SHIFT timing, Personalize trail ride settings, Optimize city riding gear switching

**In-app purchases:** none

**What reviewers like**

- 👍 Works as expected
- 🚀 Easy to connect and use
- ✨ Useful for customizing settings
- 🔋 Battery health info needed

**What reviewers complain about**

- 🐛 Connectivity issues
- 🔍 Difficult to navigate
- 🤯 Bricked bikes during firmware updates
- 🤖 Outdated and clunky interface

**Reported bugs**

- Crashes on iOS 13 and newer
- Unable to change password
- Bluetooth connection keeps dropping
- Firmware updates fail and brick the system

**Requested features**

- Add Russian language support
- Allow custom cassette size selection
- Integrate with Garmin devices
- Provide more detailed data and analytics


## Frequently asked questions

### Is SIGMA LINK free?

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

### Is E free?

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

### Which has better reviews, SIGMA LINK or E?

E is rated higher. SIGMA LINK averages 1.5 out of 5 from 8 ratings, while E averages 1.8 from 74 ratings.

### Do SIGMA LINK or E have ads?

Neither SIGMA LINK nor E shows ads.

### Which is updated more often, SIGMA LINK or E?

SIGMA LINK ships an update every 4 months, and E every 3 months. Most recently, SIGMA LINK was updated on August 12, 2026 and E on September 26, 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.*