# ESC1 vs CastleLink2

The clearest difference is update cadence: CastleLink2 at monthly against ESC1's every 3 months. ESC1's advantage is iOS requirement (15.6 vs 26.0). On price, ads, 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.

ESC1 ships an update every 3 months, CastleLink2 monthly. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ESC1 | CastleLink2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/castlelink2/id6743709203/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | — | Free |
| Size | 19 MB | 35 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [恒 韦](https://appshunter.io/developer/1778270133) | [Castle Creations Inc](https://appshunter.io/developer/1377811229) |

## What reviewers say

### ESC1

[App page](https://appshunter.io/ios/app/esc1/id6444383451)

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

**In-app purchases:** none


### CastleLink2

[App page](https://appshunter.io/ios/app/castlelink2/id6743709203)

Connect to Castle Creations ESCs and BECs via Bluetooth to adjust settings, update firmware, and view data logs. Compatible with a wide range of ESCs and BECs, supporting both B-Link hardware versions.

**Highlights:** Connect to Castle Creations ESCs/BECs, Adjust settings, Update firmware, View data logs, Supports B-Link adapters, Wide ESC/BEC compatibility

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

**In-app purchases:** none


## Frequently asked questions

### Is ESC1 free?

ESC1 is free to download, with no in-app purchases.

### Is CastleLink2 free?

CastleLink2 is free to download, with no in-app purchases.

### Do ESC1 or CastleLink2 have ads?

Neither ESC1 nor CastleLink2 shows ads.

### Which is updated more often, ESC1 or CastleLink2?

ESC1 ships an update every 3 months, and CastleLink2 monthly. Most recently, ESC1 was updated on November 7, 2026 and CastleLink2 on October 30, 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.*