# PeterJohn NumPy vs PSRayTracing

The clearest difference is price: PSRayTracing at Free against PeterJohn NumPy's $9.99. PeterJohn NumPy's advantage is update cadence (every 2 weeks vs every 30 months) and iOS requirement (15.0 vs 17). On ads, in-app purchases and device support there is nothing between them.

PSRayTracing is free to download; PeterJohn NumPy costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PeterJohn NumPy ships an update every 2 weeks, PSRayTracing every 30 months. The most recent releases landed on August 14, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | PeterJohn NumPy | PSRayTracing |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/psraytracing/id6468944135/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 30 months |
| Monetization | — | Free |
| Size | 222 MB | 29 MB |
| Requires iOS | **15.0** | 17 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yasushi Obata](https://appshunter.io/developer/899977114) | [Benjamin Summerton](https://appshunter.io/developer/1711000761) |

## What reviewers say

### PeterJohn NumPy

[App page](https://appshunter.io/ios/app/peterjohn-numpy/id1662896316)

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

**In-app purchases:** none


### PSRayTracing

[App page](https://appshunter.io/ios/app/psraytracing/id6468944135)

This application provides a graphical interface for a ray tracing engine, designed to render images faster than reference code. It includes features like threading and render progress visualization, based on "Ray Tracing in One Weekend" books.

**Highlights:** GUI frontend for ray tracing, Faster rendering than reference code, Threading support, Render progress visualization, Toggle-able features, Based on "Ray Tracing in One Weekend"

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

**In-app purchases:** none


## Frequently asked questions

### Is PeterJohn NumPy free?

PeterJohn NumPy costs $9.99, with no in-app purchases.

### Is PSRayTracing free?

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

### Do PeterJohn NumPy or PSRayTracing have ads?

Neither PeterJohn NumPy nor PSRayTracing shows ads.

### Which is updated more often, PeterJohn NumPy or PSRayTracing?

PeterJohn NumPy ships an update every 2 weeks, and PSRayTracing every 30 months. Most recently, PeterJohn NumPy was updated on August 14, 2026 and PSRayTracing on September 23, 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.*