# KEMS vs Bubble Level

The clearest difference is in-app purchases: KEMS at none against Bubble Level's 3. KEMS also leads on iOS requirement (15.1 vs 17.0). Bubble Level's advantage is update cadence (monthly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Bubble Level sells 3 in-app purchases, starting at $4.99 per 7 days. KEMS asks for nothing beyond the download.

KEMS ships an update every 3 months, Bubble Level monthly. The most recent releases landed on September 19, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | KEMS | Bubble Level |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Size | 36 MB | 5 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kedros, a.s.](https://appshunter.io/developer/1537365373) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### KEMS

[App page](https://appshunter.io/ios/app/kems/id6744016979)

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

**In-app purchases:** none


### Bubble Level

[App page](https://appshunter.io/ios/app/bubble-level-angle-finder/id6772273713)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bubble Gauge Weekly | $4.99 | per 7 days |
| Slope Finder Yearly | $24.99 | per year |
| Angle Meter, Pay Once | $49.99 | one-time |


## Frequently asked questions

### Is KEMS free?

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

### Is Bubble Level free?

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

### Do KEMS or Bubble Level have ads?

Neither KEMS nor Bubble Level shows ads.

### Which is updated more often, KEMS or Bubble Level?

KEMS ships an update every 3 months, and Bubble Level monthly. Most recently, KEMS was updated on September 19, 2026 and Bubble Level on October 13, 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.*