# Castle Link vs GACRacing

The clearest difference is rating: GACRacing at 5.0 against Castle Link's 1.8. Castle Link's advantage is ratings volume (32 vs 2) and update cadence (monthly vs every 2 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

GACRacing holds the better App Store score, 5.0 against 1.8. That said, the two scores are not equally well evidenced: Castle Link has 32 ratings behind it against 2, so its average is the more settled of the two.

Castle Link ships an update monthly, GACRacing every 2 months. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Castle Link | GACRacing |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.8 (32 ratings)](https://appshunter.io/ios/app/castle-link/id1215086336/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/gacracing/id6474413731/reviews)** |
| Number of ratings | **32** | 2 |
| Positive reviews | 18.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free | Free |
| Size | 39 MB | 23 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Castle Creations Inc](https://appshunter.io/developer/1377811229) | [琪 赵](https://appshunter.io/developer/1719818426) |

## What reviewers say

### Castle Link

[App page](https://appshunter.io/ios/app/castle-link/id1215086336)

Wirelessly program and update settings for compatible electronic speed controllers and BEC devices. Save and sync profiles across devices, and access data logs without an internet connection.

**Highlights:** Wireless programming via Bluetooth, Firmware updates, Save and load custom profiles, Sync settings across iOS devices, Offline functionality, Data log viewing

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to program ESC
- 👍 Data logging is fantastic
- 👍 Save profile feature is useful
- 👍 Convenient for quick setting changes

**What reviewers complain about**

- 🐛 App crashes frequently
- 🐛 App freezes often
- 🐛 Bluetooth connection issues
- 🐛 Bricks ESCs
- 🐛 Throttle curve not working

**Reported bugs**

- App crashes on passcode entry
- App freezes
- Bluetooth connection problems
- Bricking ESCs
- Throttle curve not working

**Requested features**

- Add data logging to iOS app
- Allow viewing data logs on phone
- Fix throttle curve interface
- Add Android application
- Make motor test selectable


### GACRacing

[App page](https://appshunter.io/ios/app/gacracing/id6474413731)

This application is an Electronic Speed Controller (ESC) designed for crawler cars. It offers exceptional low-speed control and broad compatibility with sensorless brushless motors. Users can switch between crawler and normal operating modes via PWM channels.

**Highlights:** Super smooth low-speed control, Compatible with 99% of sensorless brushless motors, Two operating modes: crawler and normal, Mode switching via PWM channels, Designed for crawler cars

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Castle Link free?

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

### Is GACRacing free?

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

### Which has better reviews, Castle Link or GACRacing?

GACRacing is rated higher. Castle Link averages 1.8 out of 5 from 32 ratings, while GACRacing averages 5.0 from 2 ratings.

### Do Castle Link or GACRacing have ads?

Neither Castle Link nor GACRacing shows ads.

### Which is updated more often, Castle Link or GACRacing?

Castle Link ships an update monthly, and GACRacing every 2 months. Most recently, Castle Link was updated on October 24, 2026 and GACRacing on October 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*