# RC Circuit Pro vs KDM Inspector

The clearest difference is rating: KDM Inspector at 4.0 against RC Circuit Pro's 1.0. RC Circuit Pro's advantage is update cadence (every 4 months vs every 38 months) and price ($0.99 vs $2.99). On review sentiment, ratings volume, ads and in-app purchases there is nothing between them.

RC Circuit Pro costs $0.99 and KDM Inspector $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

KDM Inspector holds the better App Store score, 4.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

RC Circuit Pro ships an update every 4 months, KDM Inspector every 38 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | RC Circuit Pro | KDM Inspector |
| --- | --- | --- |
| Price | **$0.99** | $2.99 |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/rc-circuit-pro/id824145786/reviews) | **[4.0 (1 ratings)](https://appshunter.io/ios/app/kdm-inspector/id837578321/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 38 months |
| Monetization | Paid | Paid |
| Size | 17 MB | 1 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Jonathan Judelson](https://appshunter.io/developer/813495416) |

## What reviewers say

### RC Circuit Pro

[App page](https://appshunter.io/ios/app/rc-circuit-pro/id824145786)

Calculate RC charging and filter circuits with ease. This tool helps hobbyists and engineers determine time constants, component values, and cutoff frequencies. Save and export your circuit data for further analysis.

**Highlights:** Calculate time constant, Find component values (R, C), Determine voltage at time t, Calculate cutoff frequency, Save data to CSV, Export data via AirDrop/iCloud Drive

**In-app purchases:** none


### KDM Inspector

[App page](https://appshunter.io/ios/app/kdm-inspector/id837578321)

This utility app helps professionals working with Digital Cinema Packages (DCPs) and KDM encryption keys. It allows users to quickly open and view essential key information directly from their iOS device, supporting various file formats.

**Highlights:** Open KDM keys from email, View key active and expiration times, See show player public key and UUID, Supports .xml and .zip KDM files, Mobile DCP/KDM management

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

**In-app purchases:** none


## Frequently asked questions

### Is RC Circuit Pro free?

RC Circuit Pro costs $0.99, with no in-app purchases.

### Is KDM Inspector free?

KDM Inspector costs $2.99, with no in-app purchases.

### Which has better reviews, RC Circuit Pro or KDM Inspector?

KDM Inspector is rated higher. RC Circuit Pro averages 1.0 out of 5 from 1 ratings, while KDM Inspector averages 4.0 from 1 ratings.

### Do RC Circuit Pro or KDM Inspector have ads?

Neither RC Circuit Pro nor KDM Inspector shows ads.

### Which is updated more often, RC Circuit Pro or KDM Inspector?

RC Circuit Pro ships an update every 4 months, and KDM Inspector every 38 months. Most recently, RC Circuit Pro was updated on November 1, 2026 and KDM Inspector on November 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.*