RC Speed Calculator Pro vs CastleLink2
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
CastleLink2
Connect to Castle Creations ESCs and BECs via Bluetooth to adjust settings, update firmware, and view data logs. Compatible with a wide range of ESCs and BECs, supporting both B-Link hardware versions.
- Connect to Castle Creations ESCs/BECs
- Adjust settings
- Update firmware
- View data logs
- Supports B-Link adapters
- Wide ESC/BEC compatibility
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Allows you to connect to most Castle Creations ESCs and BECs using the B-Link Bluetooth adapter. Adjust settings, update firmware, and view data logs (on supported products). Compatible with all Cobra, Talon, Copperhead, and X-series ESCs. It will also work with most Mamba and Sidewinder ESCs; as well as the CC BEC Pro and both CC BEC 2.0s. Supports the original B-Link and B-Link 2 hardware versions. Visit www.castlecreations.com/b-link for more information.
Screenshots
Verdict
The clearest difference is ratings volume: RC Speed Calculator Pro at 23 against CastleLink2's 2. RC Speed Calculator Pro also leads on update cadence (fortnightly vs monthly) and iOS requirement (17.0 vs 26.0). On price, rating, 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.
On the App Store both sit at effectively the same score — 4.9 for RC Speed Calculator Pro against 5.0 for CastleLink2. That said, the two scores are not equally well evidenced: RC Speed Calculator Pro has 23 ratings behind it against 2, so its average is the more settled of the two.
RC Speed Calculator Pro ships an update fortnightly, CastleLink2 monthly. The most recent releases landed on September 23, 2026 and September 8, 2026 respectively.
| Parameter | RC Speed Calculator Pro | CastleLink2 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (23 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 23 — better | 2 |
| Update frequency | Fortnightly — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 160 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | Degree3, Inc. | Castle Creations Inc |
Customer experience
RC Speed Calculator Pro
CastleLink2
In-app purchases
RC Speed Calculator Pro
No in-app purchases
CastleLink2
No in-app purchases
Questions
Is RC Speed Calculator Pro free?
Is CastleLink2 free?
Which has better reviews, RC Speed Calculator Pro or CastleLink2?
Do RC Speed Calculator Pro or CastleLink2 have ads?
Which is updated more often, RC Speed Calculator Pro or CastleLink2?
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