# InterSpec Radiation Analysis vs RPN

The clearest difference is price: InterSpec Radiation Analysis at Free against RPN's $4.99. InterSpec Radiation Analysis also leads on iOS requirement (11.0 vs 16.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

InterSpec Radiation Analysis is free to download; RPN costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

InterSpec Radiation Analysis ships an update every 11 months, RPN every 7 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | InterSpec Radiation Analysis | RPN |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.3 (12 ratings)](https://appshunter.io/ios/app/interspec-radiation-analysis/id1447080767/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 7 months** |
| Monetization | Free | — |
| Size | 80 MB | 1 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [William Johnson](https://appshunter.io/developer/1447080766) | [Steven Davies](https://appshunter.io/developer/1705785558) |

## What reviewers say

### InterSpec Radiation Analysis

[App page](https://appshunter.io/ios/app/interspec-radiation-analysis/id1447080767)

Analyze nuclear radiation spectral data to identify nuclides, determine source activity, and calculate shielding. Supports various detector file formats and includes tools for dose rate calculations and nuclide decay information.

**Highlights:** Spectral nuclear radiation data analysis, Nuclide identification, Source activity determination, Shielding amount calculation, Spectral file format conversion, Dose rate calculations, Interactive nuclide decay information

**Features:** macOS Compatibility

**In-app purchases:** none


### RPN

[App page](https://appshunter.io/ios/app/rpn-calc/id6464329997)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is InterSpec Radiation Analysis free?

InterSpec Radiation Analysis is free to download, with no in-app purchases.

### Is RPN free?

RPN costs $4.99, with no in-app purchases.

### Do InterSpec Radiation Analysis or RPN have ads?

Neither InterSpec Radiation Analysis nor RPN shows ads.

### Which is updated more often, InterSpec Radiation Analysis or RPN?

InterSpec Radiation Analysis ships an update every 11 months, and RPN every 7 months. Most recently, InterSpec Radiation Analysis was updated on October 24, 2026 and RPN on October 27, 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.*