# Bubble Level vs Slope Calc

The clearest difference is in-app purchases: Slope Calc at none against Bubble Level's 11. Slope Calc also leads on ads (none vs shown). Bubble Level's advantage is update cadence (weekly vs every 34 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Bubble Level sells 11 in-app purchases, starting at $1.99 per 7 days. Slope Calc asks for nothing beyond the download.

Bubble Level ships an update weekly, Slope Calc every 34 months. The most recent releases landed on September 24, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | Bubble Level | Slope Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (702 ratings)](https://appshunter.io/ios/app/bubble-level-ar-angle-finder/id1594066382/reviews)** | — |
| Number of ratings | **702** | — |
| Positive reviews | 41.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 34 months |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 19 MB |
| Requires iOS | 16.6 | **15.6** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPod, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Jens Rieckhof](https://appshunter.io/developer/354266124) | [Abdul Rehman](https://appshunter.io/developer/1606519308) |

## What reviewers say

### Bubble Level

[App page](https://appshunter.io/ios/app/bubble-level-ar-angle-finder/id1594066382)

This app transforms your phone into a precise leveling tool. It offers accurate angle measurement, inclination detection, and augmented reality features for DIY and professional use. Calibration is simple and quick.

**Highlights:** Ultra-precise angle measurement, Inclination and slope meter, Augmented reality ruler and protractor, Effortless one-touch calibration, Clear and easy-to-read display, User-friendly interface

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - Weekly Plan | $1.99 | per 7 days |
| Spirit Level Premium – Monthly | $2.99 | per month |
| Bubble Level Premium - Weekly | $2.99 | per 7 days |
| Bubble Level Premium - Monthly | $5.99 | per month |
| Spirit Level Premium – Annual | $14.99 | per year |
| Bubble Level Premium - Annual | $19.99 | per year |
| All features - No ads | $1.99 | one-time |
| Unlock all AR features | $5.99 | one-time |
| Discount Lifetime Premium | $14.99 | one-time |
| Bubble Level PREMIUM Lifetime | $19.99 | one-time |
| Bubble Level - Lifetime Premium | $29.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use
- 🔍 Accurate angle measurements
- 🛠️ Helpful for various tasks (telescopes, leveling, etc.)

**What reviewers complain about**

- 🤑 Expensive ad removal
- 🤖 Unreliable calibration
- 💤 Constant interruptions and ads
- 🚫 Unusable due to ads

**Reported bugs**

- App crashes on launch
- Measurement point behaves erratically

**Requested features**

- Ability to calibrate the app
- Option to change the display color


### Slope Calc

[App page](https://appshunter.io/ios/app/slope-calc-step-by-step/id6447863172)

**In-app purchases:** none


## Frequently asked questions

### Is Bubble Level free?

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

### Is Slope Calc free?

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

### Do Bubble Level or Slope Calc have ads?

Bubble Level shows ads; Slope Calc does not.

### Which is updated more often, Bubble Level or Slope Calc?

Bubble Level ships an update weekly, and Slope Calc every 34 months. Most recently, Bubble Level was updated on September 24, 2026 and Slope Calc on June 5, 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.*