# Bubble Level vs StringAlignPro

The clearest difference is price: Bubble Level at Free against StringAlignPro's $9.99. Bubble Level also leads on update cadence (weekly vs every 2 weeks). StringAlignPro's advantage is in-app purchases (none vs 11) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

Bubble Level is free to download; StringAlignPro costs $9.99 up front. Bubble Level sells 11 in-app purchases, starting at $1.99 per 7 days. StringAlignPro asks for nothing beyond the download.

Bubble Level ships an update weekly, StringAlignPro every 2 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Bubble Level | StringAlignPro |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[4.5 (720 ratings)](https://appshunter.io/ios/app/bubble-level-angle-finder-ar/id1594066382/reviews)** | — |
| Number of ratings | **720** | — |
| Positive reviews | 43.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 44 MB | 2 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jens Rieckhof](https://appshunter.io/developer/354266124) | [RaceTracs Ltd](https://appshunter.io/developer/1852276263) |

## What reviewers say

### Bubble Level

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

This app transforms your device into a precise leveling tool, offering augmented reality measurement capabilities. It's designed for both DIY enthusiasts and professionals, ensuring accurate angle and inclination measurements with a user-friendly interface. Apple Watch integration provides live readings on your wrist.

**Highlights:** Augmented reality ruler and protractor, Ultra-precise angle measurements, Effortless one-touch calibration, Clear and easy-to-read display, Apple Watch integration for live readings, Measures inclination and slope

**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


### StringAlignPro

[App page](https://appshunter.io/ios/app/stringalignpro/id6780426421)

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

**In-app purchases:** none


## Frequently asked questions

### Is Bubble Level free?

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

### Is StringAlignPro free?

StringAlignPro costs $9.99, with no in-app purchases.

### Do Bubble Level or StringAlignPro have ads?

Bubble Level shows ads; StringAlignPro does not.

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

Bubble Level ships an update weekly, and StringAlignPro every 2 weeks. Most recently, Bubble Level was updated on October 30, 2026 and StringAlignPro on October 31, 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.*