# Iso Link vs Eulerian

The clearest difference is in-app purchases: Iso Link at none against Eulerian's 9. Iso Link also leads on update cadence (every 2 weeks vs every 3 weeks) and iOS requirement (15.0 vs 17.0). Eulerian's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Eulerian sells 9 in-app purchases, starting at $3.99 per month. Iso Link asks for nothing beyond the download.

Iso Link ships an update every 2 weeks, Eulerian every 3 weeks. The most recent releases landed on October 10, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Iso Link | Eulerian |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Size | 40 MB | 19 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [书勤 吴](https://appshunter.io/developer/1869705624) | [Madhav Dogra](https://appshunter.io/developer/1866043950) |

## What reviewers say

### Iso Link

[App page](https://appshunter.io/ios/app/iso-link-one-line-drawing/id6758925470)

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

**In-app purchases:** none


### Eulerian

[App page](https://appshunter.io/ios/app/eulerian/id6760196420)

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Endless Monthly | $3.99 | per month |
| 5 Hints | $0.99 | one-time |
| 15 Hints | $1.99 | one-time |
| All Premium Themes | $3.99 | one-time |
| Double Coins | $4.99 | one-time |
| Remove Ads | $4.99 | one-time |
| 50 Hints | $4.99 | one-time |
| 150 Hints | $9.99 | one-time |
| 500 Hints | $19.99 | one-time |


## Frequently asked questions

### Is Iso Link free?

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

### Is Eulerian free?

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

### Do Iso Link or Eulerian have ads?

Iso Link shows ads; Eulerian does not.

### Which is updated more often, Iso Link or Eulerian?

Iso Link ships an update every 2 weeks, and Eulerian every 3 weeks. Most recently, Iso Link was updated on October 10, 2026 and Eulerian on October 9, 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.*