# StudioXm vs Castle Link

The clearest difference is rating: StudioXm at 3.3 against Castle Link's 1.8. Castle Link's advantage is update cadence (monthly vs every 2 months) and ratings volume (32 vs 4). 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.

StudioXm holds the better App Store score, 3.3 against 1.8. That said, the two scores are not equally well evidenced: Castle Link has 32 ratings behind it against 4, so its average is the more settled of the two.

StudioXm ships an update every 2 months, Castle Link monthly. The most recent releases landed on September 29, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | StudioXm | Castle Link |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (4 ratings)](https://appshunter.io/ios/app/studioxm/id1145413743/reviews)** | [1.8 (32 ratings)](https://appshunter.io/ios/app/castle-link/id1215086336/reviews) |
| Number of ratings | 4 | **32** |
| Positive reviews | — | 18.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | Free |
| Size | 26 MB | 39 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [freakware](https://appshunter.io/developer/445601224) | [Castle Creations Inc](https://appshunter.io/developer/1377811229) |

## What reviewers say

### StudioXm

[App page](https://appshunter.io/ios/app/studioxm/id1145413743)

This utility app allows configuration and management of specific flybarless receivers and related devices for RC helicopters. It offers features like preset backup/restore, firmware updates, and a flight logbook for battery monitoring.

**Highlights:** Configure flybarless receivers, Backup and restore presets, Perform device updates, Load helicopter specific presets, Flight log book for battery monitoring, Connects via BLE2SYS Bluetooth interface

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is StudioXm free?

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

### Is Castle Link free?

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

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

StudioXm is rated higher. StudioXm averages 3.3 out of 5 from 4 ratings, while Castle Link averages 1.8 from 32 ratings.

### Do StudioXm or Castle Link have ads?

Neither StudioXm nor Castle Link shows ads.

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

StudioXm ships an update every 2 months, and Castle Link monthly. Most recently, StudioXm was updated on September 29, 2026 and Castle Link 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.*