# Dr. DE — user reviews > 9 indexed App Store user reviews of Dr. DE by Pegasus Vertex, Inc., rated 4.50/5 from 16 ratings. - Source: https://appshunter.io/ios/app/dr-de/id954796004/reviews - App overview in markdown: https://appshunter.io/ios/app/dr-de/id954796004.md - Rating breakdown: 5★ 14 · 4★ 0 · 3★ 0 · 2★ 0 · 1★ 2 ## Most critical reviews (9 lowest-rated) ### 1/5 — Useless *2025-06-05, version 3.1.0* This use to be the best when it was an offline calculator, now it needs a data connection to load.. unfortunately we work in the oilfield and usually don’t have one in the working area ### 1/5 — Good when it works. *2024-12-29, version 3.1.0* Used this app for a while. It was great. Last updates to IOS, it won’t even load. It’s useless. ### 1/5 — Was a very nice app *2024-11-26* Used this app for a while. It was great. Last updates to IOS, it won’t even load. It’s useless. ### 1/5 — Keeps Kicking Me Out *2018-06-21, version 1.0.2* When trying to use app it keeps kicking me out of app and back to the home screen. ### 4/5 — Dr.De *2024-02-15, version 3.0.1* Hi This app don’t open for my iPhone Please check ### 5/5 — Great for field work! *2019-06-21, version 1.0.4* If you’re on the my pits and you need a quick mud mix calc, this app is amazing. That’s the main feature I use, being a mud engineer. And it’s usually right on the money within 1/10 of a ppg. ### 5/5 — Best *2017-08-04, version 1.0.2* Excellent excellent excellent ### 5/5 — Drilling engineer *2015-02-06, version 1.0.1* A simple-to-use and easy-to-learn app for a busy drilling engineer like me. A good start! ### 5/5 — Professional, accurate, east to use *2015-01-12, version 1.0.0* It's the best drilling toolbox app I've ever used. Quick calculate, accurate results, search function and more. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-18.*