# Castle Link vs RC Pit Calc Pro

The clearest difference is rating: RC Pit Calc Pro at 4.4 against Castle Link's 1.8. RC Pit Calc Pro also leads on review sentiment (60% vs 18%) and update cadence (every 5 days vs monthly). Castle Link's advantage is in-app purchases (none vs 3) and iOS requirement (12.0 vs 15.0). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. RC Pit Calc Pro sells 3 one-off in-app purchases. Castle Link asks for nothing beyond the download.

RC Pit Calc Pro holds the better App Store score, 4.4 against 1.8. Both are backed by a comparable volume of ratings — 32 and 24 respectively. Written reviews point the same way: 18% of Castle Link's written reviews are positive against 60% of RC Pit Calc Pro's.

Castle Link ships an update monthly, RC Pit Calc Pro every 5 days. The most recent releases landed on June 13, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Castle Link | RC Pit Calc Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.8 (32 ratings)](https://appshunter.io/ios/app/castle-link/id1215086336/reviews) | **[4.4 (24 ratings)](https://appshunter.io/ios/app/rc-pit-calc-pro/id1562268871/reviews)** |
| Number of ratings | **32** | 24 |
| Positive reviews | 18.2% of reviews | **60.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 39 MB | 58 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Castle Creations, Inc.](https://appshunter.io/developer/1377811229) | [Degree3, Inc.](https://appshunter.io/developer/1497876563) |

## What reviewers say

### Castle Link

[App page](https://appshunter.io/ios/app/castle-link/id1215086336)

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:** macOS Compatibility

**In-app purchases:** none


### RC Pit Calc Pro

[App page](https://appshunter.io/ios/app/rc-pit-calc-pro/id1562268871)

This app offers a suite of specialized calculators for RC car enthusiasts. It helps with gear ratios, suspension geometry, corner weights, oil viscosity, fuel usage, and top speed estimations. It also stores data for multiple cars and includes helpful guides.

**Highlights:** Gear ratio calculation, Suspension geometry analysis, Corner weight balancing, Shock oil viscosity adjustment, Fuel usage and pit stop planning, Top speed estimation, Oil blending for custom viscosity

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime backer | $2.00 | one-time |
| Lifetime Backer | $4.00 | one-time |
| Lifetime Backer | $4.99 | one-time |


## Frequently asked questions

### Is Castle Link free?

Castle Link is free to download, with no in-app purchases.

### Is RC Pit Calc Pro free?

RC Pit Calc Pro is free to download, with in-app purchases available.

### Which has better reviews, Castle Link or RC Pit Calc Pro?

RC Pit Calc Pro is rated higher. Castle Link averages 1.8 out of 5 from 32 ratings, while RC Pit Calc Pro averages 4.4 from 24 ratings.

### Do Castle Link or RC Pit Calc Pro have ads?

Neither Castle Link nor RC Pit Calc Pro shows ads.

### Which is updated more often, Castle Link or RC Pit Calc Pro?

Castle Link ships an update monthly, and RC Pit Calc Pro every 5 days. Most recently, Castle Link was updated on June 13, 2026 and RC Pit Calc Pro on September 23, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*