# CatEyeSYNC vs Millennium Running

The clearest difference is review sentiment: Millennium Running at 75% against CatEyeSYNC's 14%. Millennium Running also leads on rating (4.8 vs 1.8) and update cadence (every 2 weeks vs every 6 weeks). CatEyeSYNC's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, in-app purchases and device support there is nothing between them.

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

Millennium Running holds the better App Store score, 4.8 against 1.8. Both are backed by a comparable volume of ratings — 12 and 40 respectively. Written reviews point the same way: 14% of CatEyeSYNC's written reviews are positive against 75% of Millennium Running's.

CatEyeSYNC ships an update every 6 weeks, Millennium Running every 2 weeks. The most recent releases landed on October 14, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | CatEyeSYNC | Millennium Running |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.8 (12 ratings)](https://appshunter.io/ios/app/cateyesync/id1391517944/reviews) | **[4.8 (40 ratings)](https://appshunter.io/ios/app/millennium-running/id1519960280/reviews)** |
| Number of ratings | 12 | **40** |
| Positive reviews | 14.3% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 44 MB | 54 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CatEye Co., Ltd.](https://appshunter.io/developer/438417879) | [MILLENNIUM RUNNING, LLC](https://appshunter.io/developer/1519960279) |

## What reviewers say

### CatEyeSYNC

[App page](https://appshunter.io/ios/app/cateyesync/id1391517944)

Control and customize your CatEye bike lights. Connect multiple lights, adjust modes, and monitor battery levels for an enhanced cycling experience.

**Highlights:** Connect multiple lights, Customize light modes, View battery levels, Works with CatEye Sync products

**In-app purchases:** none


### Millennium Running

[App page](https://appshunter.io/ios/app/millennium-running/id1519960280)

This app promotes healthy lifestyles through a variety of signature road races and triathlons. It also offers a running specialty store, a running club, and comprehensive timing and event services.

**Highlights:** Signature road races and triathlons, Running specialty store, Millennium Running Club, Timing and event services, Promotes healthy lifestyles

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CatEyeSYNC free?

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

### Is Millennium Running free?

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

### Which has better reviews, CatEyeSYNC or Millennium Running?

Millennium Running is rated higher. CatEyeSYNC averages 1.8 out of 5 from 12 ratings, while Millennium Running averages 4.8 from 40 ratings.

### Do CatEyeSYNC or Millennium Running have ads?

Millennium Running shows ads; CatEyeSYNC does not.

### Which is updated more often, CatEyeSYNC or Millennium Running?

CatEyeSYNC ships an update every 6 weeks, and Millennium Running every 2 weeks. Most recently, CatEyeSYNC was updated on October 14, 2026 and Millennium Running on October 2, 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.*