Castle Link vs Vacci Dropper
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Castle Link
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.
- Wireless programming via Bluetooth
- Firmware updates
- Save and load custom profiles
- Sync settings across iOS devices
- Offline functionality
- Data log viewing
Read full descriptionHide full description
The Castle Link™ app enables users to wirelessly program settings and update firmware on any current Castle Creations ESC, many older models and the BEC 2.0/BEC Pro using the waterproof Castle B•LINK Bluetooth® adapter. You can quickly alter parameters and fine-tune adjustments anytime, anywhere. - Save profiles to allow for quick changes between settings - Sync information between multiple iOS devices - No data/internet connection required - The Castle Link app can be used with multiple B•LINK adapters or can store vehicle information and allow users to use one adapter on multiple vehicles - Each B•LINK is protected with a 4-digit passcode to prevent tampering with your settings - Download and View Data Logs from compatible controllers Requirements: - Castle B•LINK Bluetooth adapter (011-0135-00)
Vacci Dropper
Read full descriptionHide full description
The Vacci Dropper app allows for fine-grain control over the Vacci Dropper device.
Screenshots
Verdict
The clearest difference is update cadence: Castle Link at monthly against Vacci Dropper's every 2 months. Castle Link also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.0). On price, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Castle Link ships an update monthly, Vacci Dropper every 2 months. The most recent releases landed on June 13, 2026 and September 27, 2026 respectively.
| Parameter | Castle Link | Vacci Dropper |
|---|---|---|
| Price | Free | Free |
| Rating | 1.8 (32 ratings) — better | — |
| Positive reviews | 18.2% of reviews | — |
| Number of ratings | 32 — better | — |
| Update frequency | Monthly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 39 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Castle Creations, Inc. | Colorado State University |
In-app purchases
Castle Link
No in-app purchases
Vacci Dropper
No in-app purchases
