# Flatter vs Spirit Level smart

The clearest difference is in-app purchases: Flatter at none against Spirit Level smart's 1. Flatter also leads on update cadence (fortnightly vs every 2 months) and iOS requirement (12.0 vs 15.6). Spirit Level smart's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Spirit Level smart sells 1 one-off in-app purchase. Flatter asks for nothing beyond the download.

Flatter ships an update fortnightly, Spirit Level smart every 2 months. The most recent releases landed on October 29, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Flatter | Spirit Level smart |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 2 months |
| Size | 24 MB | 24 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jeong-soo Park](https://appshunter.io/developer/1248341387) | [akira ohmachi](https://appshunter.io/developer/1338624340) |

## What reviewers say

### Flatter

[App page](https://appshunter.io/ios/app/flatter-level/id1248341388)

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

**In-app purchases:** none


### Spirit Level smart

[App page](https://appshunter.io/ios/app/spirit-level-smart/id6473119678)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is Flatter free?

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

### Is Spirit Level smart free?

Spirit Level smart is free to download, with in-app purchases available.

### Do Flatter or Spirit Level smart have ads?

Flatter shows ads; Spirit Level smart does not.

### Which is updated more often, Flatter or Spirit Level smart?

Flatter ships an update fortnightly, and Spirit Level smart every 2 months. Most recently, Flatter was updated on October 29, 2026 and Spirit Level smart on November 4, 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.*