Castle Link vs RC Gears
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)
RC Gears
This application connects to a specific corner weight system to measure and display the weight distribution of RC cars. Users can view data, calibrate the scale, and adjust settings like auto power-off via Bluetooth. It's designed for precise weight analysis in RC racing.
- Measure RC car weight distribution
- View weight data via Bluetooth
- Calibrate the scale
- Set auto power-off time
- Connects to SCWS2000 system
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The Weighing app is specially designed for SkyRC SCWS2000 Corner Weight System to measure the RC car's weight distribution. The RC racers can view the weight data, calibrate the scale, set the auto power-off time through the App via Bluetooth, and so on. Weighing是一款专为SkyRC SCWS2000智能蓝牙称重器而设计的App，用以测量模型车4个角的重量分布，通过蓝牙连接App查看模型车重量分配数据， 校准称重器，及设置自动关机时间等。
Screenshots
Verdict
The clearest difference is review sentiment: RC Gears at 94% against Castle Link's 18%. RC Gears also leads on rating (4.5 vs 1.8). On price, ratings volume, update cadence and ads 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.
RC Gears holds the better App Store score, 4.5 against 1.8. Both are backed by a comparable volume of ratings — 32 and 56 respectively. Written reviews point the same way: 18% of Castle Link's written reviews are positive against 94% of RC Gears's.
Castle Link ships an update monthly, RC Gears every 5 weeks. The most recent releases landed on October 14, 2026 and October 17, 2026 respectively.
| Parameter | Castle Link | RC Gears |
|---|---|---|
| Price | Free | Free |
| Rating | 1.8 (32 ratings) | 4.5 (56 ratings) — better |
| Positive reviews | 18.2% of reviews | 94.2% of reviews — better |
| Number of ratings | 32 | 56 — better |
| Update frequency | Monthly — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 39 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Castle Creations Inc | SkyRC Technology Co.,Ltd. |
Customer experience
Castle Link
RC Gears
User reviews
Castle Link
From 32 App Store ratingsWhat we love
- 👍 Easy to program ESC
- 👍 Data logging is fantastic
- 👍 Save profile feature is useful
- 👍 Convenient for quick setting changes
Room to improve
- 🐛 App crashes frequently
- 🐛 App freezes often
- 🐛 Bluetooth connection issues
- 🐛 Bricks ESCs
- 🐛 Throttle curve not working
RC Gears
From 56 App Store ratingsWhat we love
- 👍 Easy to use
- 🚀 Accurate results
- ✨ Clean interface
- ✅ Works smoothly
- 💡 Compact and well-thought-out device
Room to improve
- 🐛 Glitchy app
- 🐛 App freezing
- 🐛 Bluetooth connection issues
- 🐛 Incompatible with iOS 18
- 🐛 Reduced functionality compared to older versions
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
RC Gears
Reported bugs
9 issues- Doesn't connect to Bluetooth with iOS 18
- Shows errors on scales
- Max speed shown is rounded to a whole number
- App still freezing up when trying to get speed information
- Bluetooth reconnect not always working
Show 4 moreShow fewer
- New update has made drag racing unusable (no time or graph displayed)
- Scales are glitchy and give different readings
- Micro USB breaking off the board (older versions)
- Bluetooth connection issue reported
Requested features
11 requests- Ability to save preset/default distances on drag mode
- Ability to export data for analysis (e.g., with Excel)
- Support for 1/5 cars
- More functions for GNSS performance analyzer
- Waterproof GNSS
Show 6 moreShow fewer
- New GPS meter with LCD display
- Record coordinates
- More applications for the device
- Develop a corner weight system for 1/5 scale
- More features for GNSS performance analyzer
- Clearer connection process explanation
In-app purchases
Castle Link
No in-app purchases
RC Gears
No in-app purchases
