# Bubble Level vs PDF Viewer

The clearest difference is ads: PDF Viewer at none against Bubble Level's shown. PDF Viewer also leads on review sentiment (89% vs 75%) and ratings volume (243 vs 60). Bubble Level's advantage is update cadence (every 2 weeks vs every 3 months). On price, rating, in-app purchases and monetization model there is nothing between them.

Both are free to download. Bubble Level sells 3 in-app purchases, starting at $1.99 per 7 days and PDF Viewer sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for Bubble Level against 4.8 for PDF Viewer. Both are backed by a comparable volume of ratings — 60 and 243 respectively. Written reviews are what separate them: 75% of Bubble Level's written reviews are positive against 89% of PDF Viewer's.

Bubble Level ships an update every 2 weeks, PDF Viewer every 3 months. The most recent releases landed on October 14, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Bubble Level | PDF Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (60 ratings)](https://appshunter.io/ios/app/bubble-level-spirit-tool/id6470280224/reviews) | **[4.8 (243 ratings)](https://appshunter.io/ios/app/pdf-viewer-reader-and-editor/id6720703022/reviews)** |
| Number of ratings | 60 | **243** |
| Positive reviews | 75.0% of reviews | **89.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | Freemium |
| Size | 16 MB | 11 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andy Sutanto](https://appshunter.io/developer/1659282966) | [Andrew Lee](https://appshunter.io/developer/1206652057) |

## What reviewers say

### Bubble Level

[App page](https://appshunter.io/ios/app/bubble-level-spirit-tool/id6470280224)

This tool helps you ensure surfaces are perfectly horizontal or vertical using various measurement modes. It offers features like angle locking, calibration for accuracy, and an audible indicator for precise leveling.

**Highlights:** Multiple leveling modes (Circle, Vertical, Horizontal, Mix), Lock current angle feature, Calibration for accurate readings, Audible indicator for perfect leveling, User-friendly interface, Angle locking

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bubble Level Pro | $1.99 | per 7 days |
| Spirit Level Pro | $19.99 | per year |
| Waterpas Pro - Waterpass | $39.99 | one-time |


### PDF Viewer

[App page](https://appshunter.io/ios/app/pdf-viewer-reader-and-editor/id6720703022)

Easily convert various file formats to PDF and back again. This app supports conversions from images, documents, and presentations, allowing you to manage and share your files efficiently. It also offers OCR capabilities to convert photos into editable text.

**Highlights:** Convert JPG, Word, Excel, PPT to PDF, Convert PDF to other formats, Share and save converted files, Access conversion history, Pull files from iCloud or gallery, Convert Photos to Text (OCR)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Converter: Premium | $4.99 | per month |
| PDF Converter: Premium | Free | one-time |

**What reviewers like**

- 👍 Easy and intuitive to use
- 🚀 Fast and efficient conversion
- 💰 Free or affordable pricing
- 📄 Excellent PDF conversion and merging capabilities
- 🎨 Clean and simple interface design

**What reviewers complain about**

- 🐛 Forced review prompt before app usage
- ❌ Missing file deletion option
- 📸 No in-app camera scanning capability
- ⚙️ No file size customization options
- 🔄 Inconsistent performance across devices

**Reported bugs**

- App doesn't function on iPad mini (current model)
- Forced review requirement blocks app access
- Document quality issues when converting images to PDF
- Occasional glitches during operation

**Requested features**

- Add file deletion functionality
- Implement in-app camera scanning feature
- Add page merge and delete options
- Include file size/quality customization
- Support for more device types (iPad compatibility)


## Frequently asked questions

### Is Bubble Level free?

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

### Is PDF Viewer free?

PDF Viewer is free to download, with in-app purchases available.

### Which has better reviews, Bubble Level or PDF Viewer?

PDF Viewer is rated higher. Bubble Level averages 4.8 out of 5 from 60 ratings, while PDF Viewer averages 4.8 from 243 ratings.

### Do Bubble Level or PDF Viewer have ads?

Bubble Level shows ads; PDF Viewer does not.

### Which is updated more often, Bubble Level or PDF Viewer?

Bubble Level ships an update every 2 weeks, and PDF Viewer every 3 months. Most recently, Bubble Level was updated on October 14, 2026 and PDF Viewer on October 21, 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.*