RC Circuit vs TrunMAS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RC Circuit
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.
- 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
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This app is used to calculate the RC charging and RC filter circuit. It is suitable for hobbyist or electronic engineer. Features * Calculate time constant from R, C * Find component value R,C from time constant * Get voltage at time t in RC charging / discharging * Calculate cutoff frequency by R, C * Find component value R,C from cutoff frequency * Save data to CSV files * Upload CSV via AirDrop / iCloud Drive * Support English, Traditional Chinese, Simplified Chinese, German, French, Italian, Spanish, Portuguese, Japanese
TrunMAS
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.
- Take photos of scenes
- Measure distances
- Measure angles
- Add notes to photos
- Works on smartphone and tablet
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TrunMAS - Your handy tool for measurement and making notes - Take a photo of the situation - Dimension all distances you need later on - Dimension all angles - Make notes All available directly on your smartphone or tablet. And as you would expect from TrunCAD: It's fast and easy!
Screenshots
Verdict
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.
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. 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.
| Parameter | RC Circuit | TrunMAS |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (5 ratings) — better | — |
| Positive reviews | — | 40.0% of reviews |
| Number of ratings | 5 — better | — |
| Update frequency | Every 6 months | Monthly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | TrunCAD GmbH |
Customer experience
RC Circuit
TrunMAS
In-app purchases
RC Circuit
- Unlock Pro features$0.99
TrunMAS
No in-app purchases
