# RC Circuit vs TrunMAS

The clearest difference is in-app purchases: TrunMAS at none against RC Circuit's 1. TrunMAS also leads on update cadence (monthly vs every 6 months) and iOS requirement (8.0 vs 12.0). On price, ads, monetization model and device support there is nothing between them.

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

RC Circuit ships an update every 6 months, TrunMAS monthly. The most recent releases landed on September 24, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | RC Circuit | TrunMAS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/rc-circuit/id824460716/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | — | 40.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | Free | Free |
| Size | 16 MB | 30 MB |
| Requires iOS | 12.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [TrunCAD GmbH](https://appshunter.io/developer/1087800326) |

## 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 |


### TrunMAS

[App page](https://appshunter.io/ios/app/trunmas/id1177930825)

Capture photos of your surroundings and add precise measurements for distances and angles. This utility app allows you to annotate these images with notes, all conveniently on your smartphone or tablet.

**Highlights:** Take photos of scenes, Measure distances, Measure angles, Add notes to photos, Works on smartphone and tablet

**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 TrunMAS free?

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

### Do RC Circuit or TrunMAS have ads?

Neither RC Circuit nor TrunMAS shows ads.

### Which is updated more often, RC Circuit or TrunMAS?

RC Circuit ships an update every 6 months, and TrunMAS monthly. Most recently, RC Circuit was updated on September 24, 2026 and TrunMAS on June 1, 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.*