# Pythagorus doodlus vs Private Notes (Nostr)

The clearest difference is in-app purchases: Private Notes (Nostr) at none against Pythagorus doodlus's 1. Private Notes (Nostr) also leads on device support (4 vs 2) and iOS requirement (15.6 vs 17.6). Pythagorus doodlus's advantage is update cadence (every 6 days vs fortnightly). On price and ads there is nothing between them.

Both are free to download. Pythagorus doodlus sells 1 in-app purchase, starting at $4.99 per year. Private Notes (Nostr) asks for nothing beyond the download.

Pythagorus doodlus ships an update every 6 days, Private Notes (Nostr) fortnightly. The most recent releases landed on September 29, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Pythagorus doodlus | Private Notes (Nostr) |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 6 days** | Fortnightly |
| Size | 7 MB | 33 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Stéphan Barbé](https://appshunter.io/developer/313949257) | [alexey popkov](https://appshunter.io/developer/1500909659) |

## What reviewers say

### Pythagorus doodlus

[App page](https://appshunter.io/ios/app/pythagorus-doodlus/id6754364531)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | per year |


### Private Notes (Nostr)

[App page](https://appshunter.io/ios/app/private-notes-nostr/id6757975921)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Pythagorus doodlus free?

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

### Is Private Notes (Nostr) free?

Private Notes (Nostr) is free to download, with no in-app purchases.

### Do Pythagorus doodlus or Private Notes (Nostr) have ads?

Both Pythagorus doodlus and Private Notes (Nostr) show ads.

### Which is updated more often, Pythagorus doodlus or Private Notes (Nostr)?

Pythagorus doodlus ships an update every 6 days, and Private Notes (Nostr) fortnightly. Most recently, Pythagorus doodlus was updated on September 29, 2026 and Private Notes (Nostr) on October 17, 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.*