# Plumb vs 4Pro Level Tools

The clearest difference is in-app purchases: 4Pro Level Tools at none against Plumb's 1. 4Pro Level Tools also leads on update cadence (daily vs every 3 weeks) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Plumb sells 1 in-app purchase, starting at $9.99 per year. 4Pro Level Tools asks for nothing beyond the download.

Plumb ships an update every 3 weeks, 4Pro Level Tools daily. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Plumb | 4Pro Level Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (9 ratings)](https://appshunter.io/ios/app/plumb-bubble-spirit-level/id6760734372/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Monetization | Free | — |
| Size | 2 MB | 28 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [National Tool Works LLC](https://appshunter.io/developer/1885230787) | [Chotika Towmontree](https://appshunter.io/developer/1575086311) |

## What reviewers say

### Plumb

[App page](https://appshunter.io/ios/app/plumb-bubble-spirit-level/id6760734372)

This tool simulates a physical spirit level with realistic physics and fluid optics. It offers multiple display modes for angles and surfaces, with customizable feedback for precise measurements. Features include calibration, night mode, and various themes for different lighting conditions.

**Highlights:** Realistic bubble level physics, Surface bullseye level, Customizable angle measurement, Multiple display modes, Auto-orientation detection, Hold reading function, Visual, audio, and haptic feedback

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plumb Pro | $9.99 | per year |


### 4Pro Level Tools

[App page](https://appshunter.io/ios/app/4pro-level-tools/id6787442615)

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

**In-app purchases:** none


## Frequently asked questions

### Is Plumb free?

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

### Is 4Pro Level Tools free?

4Pro Level Tools is free to download, with no in-app purchases.

### Do Plumb or 4Pro Level Tools have ads?

Neither Plumb nor 4Pro Level Tools shows ads.

### Which is updated more often, Plumb or 4Pro Level Tools?

Plumb ships an update every 3 weeks, and 4Pro Level Tools daily. Most recently, Plumb was updated on October 24, 2026 and 4Pro Level Tools on October 7, 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.*