# Argon4 vs Notum

The clearest difference is in-app purchases: Argon4 at none against Notum's 5. Argon4 also leads on iOS requirement (8.0 vs 13.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Notum sells 5 in-app purchases, starting at $4.99 per 7 days. Argon4 asks for nothing beyond the download.

Argon4 ships an update every 2 weeks, Notum every 3 weeks. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Argon4 | Notum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/argon4/id1089308600/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Free | — |
| Size | 62 MB | 143 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Georgia Tech](https://appshunter.io/developer/387043502) | [Artyom Frolov](https://appshunter.io/developer/1816255255) |

## What reviewers say

### Argon4

[App page](https://appshunter.io/ios/app/argon4/id1089308600)

This app allows developers to create augmented reality experiences using open web standards. It seamlessly integrates advanced AR technology with iOS web capabilities, enabling the internet to be experienced in the real world through a device's sensors.

**Highlights:** Augmented Reality Browser, Open Web Standards, iOS Web Technology Integration, Device Sensor Leverage, AR Web Application Development, JavaScript API Exposure

**In-app purchases:** none


### Notum

[App page](https://appshunter.io/ios/app/notum-ai-note-taker/id6757533461)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Notum Pro Weekly | $4.99 | per 7 days |
| Notum Pro Monthly | $14.99 | per month |
| Notum 60 Extra Minutes | $1.49 | one-time |
| Notum 200 Extra Minutes | $3.49 | one-time |
| Notum 500 Extra Minutes | $7.99 | one-time |


## Frequently asked questions

### Is Argon4 free?

Argon4 is free to download, with no in-app purchases.

### Is Notum free?

Notum is free to download, with in-app purchases available.

### Do Argon4 or Notum have ads?

Neither Argon4 nor Notum shows ads.

### Which is updated more often, Argon4 or Notum?

Argon4 ships an update every 2 weeks, and Notum every 3 weeks. Most recently, Argon4 was updated on November 2, 2026 and Notum on October 25, 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.*