# Fill One Line 3D vs Eulerian

The clearest difference is in-app purchases: Fill One Line 3D at none against Eulerian's 9. Fill One Line 3D also leads on iOS requirement (12.0 vs 17.0). Eulerian's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 22 months). 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. Fill One Line 3D asks for nothing beyond the download.

Fill One Line 3D ships an update every 22 months, Eulerian every 3 weeks. The most recent releases landed on November 7, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Fill One Line 3D | Eulerian |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 22 months | **Every 3 weeks** |
| Size | 63 MB | 19 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Phuong Ta](https://appshunter.io/developer/1466076556) | [Madhav Dogra](https://appshunter.io/developer/1866043950) |

## What reviewers say

### Fill One Line 3D

[App page](https://appshunter.io/ios/app/fill-one-line-3d/id1590675459)

**Features:** macOS Compatibility

**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 Fill One Line 3D free?

Fill One Line 3D is free to download, with no in-app purchases.

### Is Eulerian free?

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

### Do Fill One Line 3D or Eulerian have ads?

Fill One Line 3D shows ads; Eulerian does not.

### Which is updated more often, Fill One Line 3D or Eulerian?

Fill One Line 3D ships an update every 22 months, and Eulerian every 3 weeks. Most recently, Fill One Line 3D was updated on November 7, 2026 and Eulerian on November 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*