# PeterJohn NumPy vs Vision Detector

The clearest difference is price: Vision Detector at Free against PeterJohn NumPy's $9.99. Vision Detector also leads on update cadence (every 5 days vs every 2 weeks). PeterJohn NumPy's advantage is iOS requirement (15.0 vs 18.2). On ads, in-app purchases and device support there is nothing between them.

Vision Detector 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, Vision Detector every 5 days. Both last shipped on November 3, 2026.

## The numbers

| Metric | PeterJohn NumPy | Vision Detector |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | — | Free |
| Size | 222 MB | 2 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Yasushi Obata](https://appshunter.io/developer/899977114) | [Kazufumi Suzuki](https://appshunter.io/developer/1512087197) |

## 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


### Vision Detector

[App page](https://appshunter.io/ios/app/vision-detector/id6443729650)

Easily test and evaluate Core ML models on your iPhone or iPad. Load your own models from various cloud services or local storage and run them using live camera feed or stored images. Supports image classification, object detection, and style transfer.

**Highlights:** Run Core ML models on device, Load models from cloud storage, Live camera feed inference, Image classification support, Object detection support, Style transfer support

**Features:** 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 Vision Detector free?

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

### Do PeterJohn NumPy or Vision Detector have ads?

Neither PeterJohn NumPy nor Vision Detector shows ads.

### Which is updated more often, PeterJohn NumPy or Vision Detector?

PeterJohn NumPy ships an update every 2 weeks, and Vision Detector every 5 days. Most recently, PeterJohn NumPy was updated on November 3, 2026 and Vision Detector on November 3, 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.*