Comparison

Castle Link vs Racebox

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Wireless programming via Bluetooth
  • Firmware updates
  • Save and load custom profiles
  • Sync settings across iOS devices
  • Offline functionality
  • Data log viewing
Features
Read 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)

About

Racebox

Features
Read full description

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

Castle Link4 screens
Racebox4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Castle Link ships an update monthly, Racebox every 2 weeks. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

Scorecard1 real difference · 9 level
Castle Link versus Racebox: the parameters behind the verdict, then further details
ParameterCastle LinkRacebox
PriceFreeFree
Rating1.8 (32 ratings) — better—
Positive reviews18.2% of reviews—
Number of ratings32 — better—
Update frequencyMonthlyEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size39 MB57 MB
Age rating4+4+
DeveloperCastle Creations IncDmitry 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 more
  • 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 more
  • 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

None

Castle Link

No in-app purchases

None

Racebox

No in-app purchases

Questions

Is Castle Link free?
Castle Link is free to download, with no in-app purchases.
Is Racebox free?
Racebox is free to download, with no in-app purchases.
Do Castle Link or Racebox have ads?
Neither Castle Link nor Racebox shows ads.
Which is updated more often, Castle Link or Racebox?
Castle Link ships an update monthly, and Racebox every 2 weeks. Most recently, Castle Link was updated on October 24, 2026 and Racebox on October 27, 2026.

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