# RC Circuit vs 小灵龙App

The clearest difference is rating: RC Circuit at 4.8 against 小灵龙App's 1.0. RC Circuit also leads on ads (none vs shown). 小灵龙App's advantage is in-app purchases (none vs 1) and update cadence (monthly vs every 6 months). On price, ratings volume, monetization model and device support there is nothing between them.

Both are free to download. RC Circuit sells 1 one-off in-app purchase. 小灵龙App asks for nothing beyond the download.

RC Circuit holds the better App Store score, 4.8 against 1.0. Both are backed by a comparable volume of ratings — 5 and 12 respectively.

RC Circuit ships an update every 6 months, 小灵龙App monthly. The most recent releases landed on September 24, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | RC Circuit | 小灵龙App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/rc-circuit/id824460716/reviews)** | [1.0 (12 ratings)](https://appshunter.io/ios/app/app/id1221738240/reviews) |
| Number of ratings | 5 | **12** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | Free | Free |
| Size | 16 MB | 157 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [北京新中新诚通信息技术股份有限公司](https://appshunter.io/developer/736575065) |

## 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 |


### 小灵龙App

[App page](https://appshunter.io/ios/app/app/id1221738240)

This app provides comprehensive mobile services for campus cards, including traditional card functions like consumption and authentication, enhanced with QR code capabilities. It offers features for managing your campus card, paying various campus fees, and booking campus facilities.

**Highlights:** Campus card management, QR code functionality, Campus fee payments, Facility booking, Card application and registration

**In-app purchases:** none


## Frequently asked questions

### Is RC Circuit free?

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

### Is 小灵龙App free?

小灵龙App is free to download, with no in-app purchases.

### Which has better reviews, RC Circuit or 小灵龙App?

RC Circuit is rated higher. RC Circuit averages 4.8 out of 5 from 5 ratings, while 小灵龙App averages 1.0 from 12 ratings.

### Do RC Circuit or 小灵龙App have ads?

小灵龙App shows ads; RC Circuit does not.

### Which is updated more often, RC Circuit or 小灵龙App?

RC Circuit ships an update every 6 months, and 小灵龙App monthly. Most recently, RC Circuit was updated on September 24, 2026 and 小灵龙App on September 22, 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.*