# PRO vs E3 Drying

The clearest difference is ratings volume: PRO at 107 against E3 Drying's 10. E3 Drying's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 16.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for PRO against 5.0 for E3 Drying. That said, the two scores are not equally well evidenced: PRO has 107 ratings behind it against 10, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 10, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | PRO | E3 Drying |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (107 ratings)](https://appshunter.io/ios/app/pro-lab-247/id1251063238/reviews) | **[5.0 (10 ratings)](https://appshunter.io/ios/app/e3-drying/id1513574356/reviews)** |
| Number of ratings | **107** | 10 |
| Positive reviews | 30.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | Free |
| Size | 9 MB | 68 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Professional Laboratories](https://appshunter.io/developer/1251063237) | [Scott Dewald](https://appshunter.io/developer/1513574355) |

## What reviewers say

### PRO

[App page](https://appshunter.io/ios/app/pro-lab-247/id1251063238)

Access comprehensive laboratory testing for environmental pollutants like mold, radon, and lead. This service is backed by certified professionals and offers simplified processing with bundled supplies and analysis fees.

**Highlights:** Mold testing, Radon testing, Lead testing, Allergen testing, Asbestos testing, Drinking water analysis, Certified professionals

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

**In-app purchases:** none


### E3 Drying

[App page](https://appshunter.io/ios/app/e3-drying/id1513574356)

This utility app provides water mitigation professionals with proprietary algorithms and metrics to precisely control drying chambers. It introduces a patent-pending E3 metric to evaluate evaporation ability and set daily targets, allowing for optimized equipment selection and performance comparison.

**Highlights:** Proprietary algorithms for drying chamber control, Patent-pending E3 metric for evaporation evaluation, Daily E3 targets for various equipment and conditions, Equipment ranking and comparison, Control regardless of chamber size or outside conditions

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PRO free?

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

### Is E3 Drying free?

E3 Drying is free to download, with no in-app purchases.

### Which has better reviews, PRO or E3 Drying?

E3 Drying is rated higher. PRO averages 4.9 out of 5 from 107 ratings, while E3 Drying averages 5.0 from 10 ratings.

### Do PRO or E3 Drying have ads?

Neither PRO nor E3 Drying shows ads.

### Which is updated more often, PRO or E3 Drying?

PRO ships an update every 3 weeks, and E3 Drying every 3 weeks. Most recently, PRO was updated on October 10, 2026 and E3 Drying on October 2, 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.*