# Bubble level and Clinometer vs OTA Tools

The clearest difference is price: OTA Tools at Free against Bubble level and Clinometer's $0.99. Bubble level and Clinometer's advantage is iOS requirement (11.0 vs 15.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

OTA Tools is free to download; Bubble level and Clinometer costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Bubble level and Clinometer ships an update every 7 months, OTA Tools every 13 months. The most recent releases landed on September 22, 2026 and August 12, 2026 respectively.

## The numbers

| Metric | Bubble level and Clinometer | OTA Tools |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.1 (9 ratings)](https://appshunter.io/ios/app/bubble-level-and-clinometer/id304152770/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 94.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 13 months |
| Monetization | Free | — |
| Size | 13 MB | 27 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Peter Breitling](https://appshunter.io/developer/286215120) | [Fitshow (Xiamen) Infomation Technology Co., Ltd.](https://appshunter.io/developer/1099080594) |

## What reviewers say

### Bubble level and Clinometer

[App page](https://appshunter.io/ios/app/bubble-level-and-clinometer/id304152770)

This app provides precise slope and angle measurements using your device's sensors. It offers multiple units, adjustable lock sensitivity, and a peer mode for measuring angles between two devices. Customize the display with different color schemes and prevent sleep mode with adjustable auto-lock.

**Highlights:** Multiple unit modes (degrees, percentage, rise/run), Adjustable dial rotation, Motion-sensitive lock feature, Volume button lock, Peer mode for two-device measurements, Fullscreen mode, Customizable color schemes

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

**In-app purchases:** none


### OTA Tools

[App page](https://appshunter.io/ios/app/ota-tools-treadmill/id6470582822)

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

**In-app purchases:** none


## Frequently asked questions

### Is Bubble level and Clinometer free?

Bubble level and Clinometer costs $0.99, with no in-app purchases.

### Is OTA Tools free?

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

### Do Bubble level and Clinometer or OTA Tools have ads?

Neither Bubble level and Clinometer nor OTA Tools shows ads.

### Which is updated more often, Bubble level and Clinometer or OTA Tools?

Bubble level and Clinometer ships an update every 7 months, and OTA Tools every 13 months. Most recently, Bubble level and Clinometer was updated on September 22, 2026 and OTA Tools on August 12, 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.*