# Rieter Calculator vs Bubble Level AI

The clearest difference is rating: Bubble Level AI at 5.0 against Rieter Calculator's 2.5. Bubble Level AI also leads on update cadence (every 2 months vs every 26 months) and review sentiment (100% vs 83%). Rieter Calculator's advantage is in-app purchases (none vs 2) and iOS requirement (9.1 vs 18.0). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Bubble Level AI sells 2 in-app purchases, starting at $0.99 per month. Rieter Calculator asks for nothing beyond the download.

Bubble Level AI holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews point the same way: 83% of Rieter Calculator's written reviews are positive against 100% of Bubble Level AI's.

Rieter Calculator ships an update every 26 months, Bubble Level AI every 2 months. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Rieter Calculator | Bubble Level AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.5 (2 ratings)](https://appshunter.io/ios/app/rieter-calculator/id797533098/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/bubble-level-ai-phone-leveler/id6772351219/reviews)** |
| Number of ratings | 2 | **4** |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 5 MB | 6 MB |
| Requires iOS | **9.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Rieter Machine Works Ltd.](https://appshunter.io/developer/733788044) | [Kirby Salter](https://appshunter.io/developer/1896698913) |

## What reviewers say

### Rieter Calculator

[App page](https://appshunter.io/ios/app/rieter-calculator/id797533098)

This utility app converts textile units like yarn count between different systems. It also includes basic calculator functions for everyday use.

**Highlights:** Textile unit conversion, Yarn count conversion (Ne to Nm), Basic calculator functions

**Features:** macOS Compatibility

**In-app purchases:** none


### Bubble Level AI

[App page](https://appshunter.io/ios/app/bubble-level-ai-phone-leveler/id6772351219)

This app transforms your device into a high-precision measurement tool for levels, surfaces, and angles. It offers real-time sensor data, voice guidance for hands-free operation, and camera integration for easy setup. Advanced features and unlimited history are available via an in-app purchase.

**Highlights:** Multi-mode measurements (Level, Surface, Angle), Live motion sensor data, Voice guidance for hands-free use, Camera integration for measurement grids, Orientation lock and calibration, Data export (text, CSV), Offline functionality

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $0.99 | per month |
| Lifetime Premium Access | $4.99 | one-time |


## Frequently asked questions

### Is Rieter Calculator free?

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

### Is Bubble Level AI free?

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

### Which has better reviews, Rieter Calculator or Bubble Level AI?

Bubble Level AI is rated higher. Rieter Calculator averages 2.5 out of 5 from 2 ratings, while Bubble Level AI averages 5.0 from 4 ratings.

### Do Rieter Calculator or Bubble Level AI have ads?

Neither Rieter Calculator nor Bubble Level AI shows ads.

### Which is updated more often, Rieter Calculator or Bubble Level AI?

Rieter Calculator ships an update every 26 months, and Bubble Level AI every 2 months. Most recently, Rieter Calculator was updated on November 1, 2026 and Bubble Level AI 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.*