# E3 Drying vs GearTech OS

The clearest difference is update cadence: GearTech OS at every 5 days against E3 Drying's every 3 weeks. E3 Drying's advantage is iOS requirement (12.0 vs 16.0). On price, rating, ratings volume 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 — 5.0 for E3 Drying against 5.0 for GearTech OS. Both are backed by a comparable volume of ratings — 10 and 10 respectively.

E3 Drying ships an update every 3 weeks, GearTech OS every 5 days. The most recent releases landed on June 4, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | E3 Drying | GearTech OS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (10 ratings)](https://appshunter.io/ios/app/e3-drying/id1513574356/reviews) | [5.0 (10 ratings)](https://appshunter.io/ios/app/geartech-os/id6785117856/reviews) |
| Number of ratings | 10 | 10 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Free | Free |
| Size | 68 MB | 2 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Scott Dewald](https://appshunter.io/developer/1513574355) | [Josue Ponce](https://appshunter.io/developer/6785117860) |

## What reviewers say

### 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


### GearTech OS

[App page](https://appshunter.io/ios/app/geartech-os/id6785117856)

This app provides specialized calculation tools for various trades, including pipefitting, welding, electrical, and framing. It displays the math behind each result and generates real diagrams of what you're building. Works offline and is ad-free.

**Highlights:** Specialized tools for 10+ trades, Detailed math for every calculation, Real diagrams of built components, Offline functionality, Bilingual (English/Spanish), No ads or tracking

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

**In-app purchases:** none


## Frequently asked questions

### Is E3 Drying free?

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

### Is GearTech OS free?

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

### Which has better reviews, E3 Drying or GearTech OS?

E3 Drying and GearTech OS are both rated 5.0 out of 5 on the App Store, from 10 and 10 ratings respectively.

### Do E3 Drying or GearTech OS have ads?

Neither E3 Drying nor GearTech OS shows ads.

### Which is updated more often, E3 Drying or GearTech OS?

E3 Drying ships an update every 3 weeks, and GearTech OS every 5 days. Most recently, E3 Drying was updated on June 4, 2026 and GearTech OS on September 24, 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.*