Castle Link vs RC Speed Calculator Pro
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 Speed Calculator Pro
Estimate your RC car's top speed by inputting details about its gearing, motor, and batteries. Record your estimates and actual speeds to compare different setups.
- Estimate RC car top speed
- Input gearing, motor, and battery info
- Record speed estimates
- Log actual top speeds
- Compare different car setups
- Pre-filled car data
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Also try RC Speed Run to log and share your fastest runs! https://www.sodialed.com/apps/rc-speed-run Quickly and easily get an estimate for your RC car's top speed with RC Speed Calculator Pro! Just tell us which car you have, enter some info about your gearing, motor and batteries, and we'll do the rest. Record your estimates to compare different car setups, and if you have a speed gun, you can record your actual top speed along with the estimate. Info you'll need: - Pinion gear teeth - Battery cells (or voltage) - Motor Kv rating - Tire diameter (we can fill this in based on your car type) Info we probably have already based on your car: - Spur gear teeth - Transmission ratio Please note, our top speed estimates are just that - estimates! We use a formula that works in theory (in perfect, not real-world conditions), but every car and all driving conditions are different, so expect some variation from real measured speeds.
Screenshots
Verdict
The clearest difference is review sentiment: RC Speed Calculator Pro at 100% against Castle Link's 18%. RC Speed Calculator Pro also leads on rating (4.9 vs 1.8) and update cadence (fortnightly vs monthly). Castle Link's advantage is iOS requirement (12.0 vs 17.0). On price, ratings volume, 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.
RC Speed Calculator Pro holds the better App Store score, 4.9 against 1.8. Both are backed by a comparable volume of ratings — 32 and 23 respectively. Written reviews point the same way: 18% of Castle Link's written reviews are positive against 100% of RC Speed Calculator Pro's.
Castle Link ships an update monthly, RC Speed Calculator Pro fortnightly. The most recent releases landed on June 13, 2026 and September 23, 2026 respectively.
| Parameter | Castle Link | RC Speed Calculator Pro |
|---|---|---|
| Price | Free | Free |
| Rating | 1.8 (32 ratings) | 4.9 (23 ratings) — better |
| Positive reviews | 18.2% of reviews | 100.0% of reviews — better |
| Number of ratings | 32 — better | 23 |
| Update frequency | Monthly | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 39 MB | 160 MB |
| Age rating | 4+ | 4+ |
| Developer | Castle Creations, Inc. | Degree3, Inc. |
Customer experience
Castle Link
RC Speed Calculator Pro
In-app purchases
Castle Link
No in-app purchases
RC Speed Calculator Pro
No in-app purchases
Questions
Is Castle Link free?
Is RC Speed Calculator Pro free?
Which has better reviews, Castle Link or RC Speed Calculator Pro?
Do Castle Link or RC Speed Calculator Pro have ads?
Which is updated more often, Castle Link or RC Speed Calculator Pro?
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