E3 Drying vs GearTech OS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
E3 Drying
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.
- 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
Read full descriptionHide full description
This app is built for all levels of restorers in the water mitigation industry. For the first time ever these proprietary algorithms and metrics will give the restorer complete control of their drying chamber regardless of the size, class, equipment used or outside conditions instead of the restorer being controlled by their chamber. The keystone metric for this app is the patent pending E3 metric that can evaluate the exact evaporation ability of any condition in a drying chamber and the daily E3 targets that have been set for all different types of drying equipment for all possible water classes and outside conditions. This metric also allows for all different types of equipment to be specifically ranked or compared to prove which is the best for any job scenario.
GearTech OS
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.
- Specialized tools for 10+ trades
- Detailed math for every calculation
- Real diagrams of built components
- Offline functionality
- Bilingual (English/Spanish)
- No ads or tracking
Read full descriptionHide full description
GearTech OS replaces the box of single-purpose calculators in your truck with one app built for the trades — by someone who works them. Pick your trade and get tools made for it: pipefitting, welding, electrical, framing, concrete, HVAC, plumbing, machining, solar, sheet metal and automotive. No pipe jargon cluttering the electrician's screen, no electrical keys on the welder's — each trade gets its own tools and its own keypad shortcuts. EVERY result shows the math. Tap "Show math" under any answer to see the formula, your numbers plugged in, and the result. Learn it, trust it, and check your work in the field. REAL diagrams. Every tool draws what you're building — a 3D rolling offset box, a butt-weld elbow you can cut to a custom degree, a saddle/fishmouth, a reducer cone, roof rafters, conduit fill, ducts, gears and more. NEW — CRANE HAND SIGNALS IN 3D. 22 ASME B30.5 signals. The signal person gives the signal and the crane performs the motion, with the load always plumb. Spin the camera and watch it from wherever you have to stand. NEW — FLANGE BOLT-UP. Target-stress torque by bolt size, material, lubricant and percentage of yield, with the 30/60/100% passes worked out and the tightening order drawn for 4 to 32 bolts. Built for pipefitters and welders first: - Pipe offsets, rolling offsets, fishmouth/saddle templates, miters, trunnions, reducers (concentric & eccentric), and ASME B16.9 fittings with custom degrees - Spread/line banks, slope/grade, thermal expansion - Crane hand signals in 3D and flange bolt-up torque - Constants cheat-sheet and a 272-question practice EXAM for the NITC / UA STAR, including crane signal person — every question explained step by step, and the app remembers what you missed Plus 100+ tools across 10 more trades: - Electrical: voltage drop, conduit fill (NEC), box fill, ampacity + derating, motor FLC, 3-phase power, stub-up take-up - Framing: rafters, hip/valley/jack, stairs, pitch, baluster spacing, board feet - Concrete: slab/footing/column volume, bags, rebar, blocks - HVAC: tonnage, CFM, duct sizing (round & rect), friction rate, sensible BTU - Plumbing: drain slope, DFU, fixture units to GPM, pipe sizing, gas pipe - Machinist, Solar, Welding, Sheet metal, Automotive Works 100% offline — the 3D included. No account, no ads, no tracking. Your settings, cut lists and memories stay on your phone. Bilingual: English and Spanish, switch anytime. We build the world around us. Our tools should be built for us. — Per Diem Syndicate
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | E3 Drying | GearTech OS |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (10 ratings) | 5.0 (10 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 10 | 10 |
| Update frequency | Every 3 weeks | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 68 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Scott Dewald | Josue Ponce |
Customer experience
E3 Drying
GearTech OS
In-app purchases
E3 Drying
No in-app purchases
GearTech OS
No in-app purchases









