Castle Link vs Racebox
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
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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)
Racebox
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Racebox companion app allows you to get detailed and precise results about your vehicle dynamics at 16Hz when paired with an external Racebox Bluetooth GPS device. The app will allow to: - Measure acceleration time from a standstill to a certain speed (0-60 km/h, 0-100 km/h, etc.) - Measure acceleration time from a standstill to a certain distance (60 ft, 1/4 mile, 1 mile, etc.) - Measure acceleration time in a certain speed range (80-120 km/h, 100-200 km/h, etc.) - Set up your custom metrics for speed and distance - Show your current driving data (altitude, heading, acceleration, road incline, precise speed, etc.) - Save VIDEO of your racing, follow onboarding instructions inside the app! All test runs are saved to the internal database allowing further sorting and filtering. For every test run the app keeps all necessary information for further analysis: - Detailed results for all metrics - Driving logs in CSV format - Result status based on road incline - Test run live map - Top speed and acceleration during the run Racebox app allows the creation of multiple user profiles for different vehicles. Select your preferred language inside the app. Export and share your test results! IMPORTANT: This app works only with Racebox devices (www.racebox.ru) and NOT with the iOS device's internal GPS.
Screenshots
Verdict
The clearest difference is iOS requirement: Castle Link at 12.0 against Racebox's 15.0. On price, update cadence, 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, Racebox every 2 weeks. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.
| Parameter | Castle Link | Racebox |
|---|---|---|
| Price | Free | Free |
| Rating | 1.8 (32 ratings) — better | — |
| Positive reviews | 18.2% of reviews | — |
| Number of ratings | 32 — better | — |
| Update frequency | Monthly | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 39 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Castle Creations Inc | Dmitry Borodaenko |
Bugs and requests
Castle Link
Reported bugs
16 issues- App crashes on passcode entry
- App freezes
- Bluetooth connection problems
- Bricking ESCs
- Throttle curve not working
Show 11 moreShow fewer
- Demo mode not functional
- Torque settings not saving
- Motor test not selectable
- Data logging issues
- Latest update causing problems
- Incompatibility with newer products
- Loading screen stuck
- Locking out ESC and beeping
- ESC not recognized by app
- Lost connection to ESC
- Firmware update failure
Requested features
9 requests- Add data logging to iOS app
- Allow viewing data logs on phone
- Fix throttle curve interface
- Add Android application
- Make motor test selectable
Show 4 moreShow fewer
- Fix data logging history clearing
- Allow firmware updates via app
- Support for newer ESCs (e.g., Copperhead)
- Allow app to work with cables
Racebox
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Castle Link
No in-app purchases
Racebox
No in-app purchases









