# RC Circuit vs keyes Bit Car

The clearest difference is in-app purchases: keyes Bit Car at none against RC Circuit's 1. keyes Bit Car also leads on iOS requirement (10.1 vs 12.0). RC Circuit's advantage is update cadence (every 6 months vs every 33 months). On price, ads and device support there is nothing between them.

Both are free to download. RC Circuit sells 1 one-off in-app purchase. keyes Bit Car asks for nothing beyond the download.

RC Circuit ships an update every 6 months, keyes Bit Car every 33 months. The most recent releases landed on October 5, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | RC Circuit | keyes Bit Car |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/rc-circuit/id824460716/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 33 months |
| Monetization | Free | — |
| Size | 16 MB | 10 MB |
| Requires iOS | 12.0 | **10.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [克俭 左](https://appshunter.io/developer/1449795321) |

## What reviewers say

### RC Circuit

[App page](https://appshunter.io/ios/app/rc-circuit/id824460716)

Calculate RC charging and filter circuits, including time constants and cutoff frequencies. Find component values from these parameters or get voltage at specific times. Save and share data easily.

**Highlights:** Calculate time constant, Find component values, Get voltage at time t, Calculate cutoff frequency, Save data to CSV, Upload CSV via AirDrop/iCloud Drive, Multi-language support

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro features | $0.99 | one-time |


### keyes Bit Car

[App page](https://appshunter.io/ios/app/keyes-bit-car/id1524897128)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RC Circuit free?

RC Circuit is free to download, with in-app purchases available.

### Is keyes Bit Car free?

keyes Bit Car is free to download, with no in-app purchases.

### Do RC Circuit or keyes Bit Car have ads?

Neither RC Circuit nor keyes Bit Car shows ads.

### Which is updated more often, RC Circuit or keyes Bit Car?

RC Circuit ships an update every 6 months, and keyes Bit Car every 33 months. Most recently, RC Circuit was updated on October 5, 2026 and keyes Bit Car on October 11, 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.*