# Ref Tools — user reviews > 52 indexed App Store user reviews of Ref Tools by Danfoss A/S, rated 3.90/5 from 52 ratings. - Source: https://appshunter.io/ios/app/ref-tools/id472312541/reviews - App overview in markdown: https://appshunter.io/ios/app/ref-tools/id472312541.md - Rating breakdown: 5★ 28 · 4★ 10 · 3★ 2 · 2★ 6 · 1★ 6 ## Newest reviews (12 of 52) ### 2/5 — Mac Mini M4 *2025-08-23, version 6.62.1* I was very pleased when I discovered this tool on the Mac M4 MacOS App Library. Until I installed and tried to run it. It CRASHED instantly. 🥴 Please fix it. ### 4/5 — App won’t work *2025-01-04, version 6.62.0.* App won’t open on iPhone. It used to work good and suddenly every time I try to open it, it crashes. Please fix it!! ### 2/5 — Disappears *2024-12-01, version 6.62.0.* When I tap on the app, Ref Tools app flashes up and disappears all within about a second. It works on my iPad but not on my iPhone. It is a nice app but I wish it would work on my iPhone. ### 4/5 — App won’t work *2024-11-28* App won’t open… ### 2/5 — Annoying *2024-08-30, version 6.45.0* Will not save on my phone Home Screen have to open the App Store ever time I want you use it ### 4/5 — Incorrect PT Charting for r134a *2024-01-15, version 6.34.0* I’ve been using this app for a long time and really like it never had any issues until now. I was looking up the saturation temperature for an r134a wine unit which had a 21° suction pressure and the app says it is -0.34°, which is incorrect. Can you fix this please? ### 4/5 — Usefull App for HVACR *2023-05-08, version 6.29.0* Hi The “Documents & Visuals” issue rectified in this update but still when I try to see details of refrigerants, the information doesn’t slide down and can see till crit. Pressure. Thanks ### 3/5 — Refrigerant temp to psi off *2022-03-29, version 6.21.0* R407C doesn’t have the correct temp to pressure ratio? Haven’t checked any other refrigerants, but I love the layout of the app and switching between a apps is a pain all the time. Sucks… ### 4/5 — Please fix just a few things. *2019-10-10, version 4.3.2* First of all I do love this app and appreciate it, it takes away the hassle of having to either carry around a P/T chart or look up each refrigerant individually which makes jobs a lot easier. The only thing that annoys me right now is that on my new iPhone 10 the list of refrigerants seems to be shifted upwards to where I cannot tap on the top of the list as it is blocked by the search bar, mainly R-12. I would greatly appreciate if this was fixed and can provide pictures if you need further evidence. Otherwise an invaluable tool for every HVAC/R tech. ### 4/5 — Best one I’ve found *2019-03-31, version 4.3.2* Although I would like to see R-11 in the next update. Also R-123 only goes down to 40 degrees. ### 3/5 — Works good but has a bug with R744A only goes to 60 psi *2016-09-12, version 3.5.0* Can we have R744 and R744A go to 0 psia, thanks ### 3/5 — Limitations *2016-02-18, version 3.3.0* Application is useful and easy to use! However, the scale did not go low enough for what I needed. Was trying to see R-123 less than 40F, and the scale did not go into a deep enough vacuum. ## Most critical reviews (10 lowest-rated) ### 1/5 — New release no longer opens *2024-11-10, version 6.61.* Since the recent release, when I open the app, it immediately shuts off. No longer usable. Is it because it now requires most recent iOS? I have 15.6.1 on iPhone 8. ### 1/5 — SP22 drop in for R22 *2020-08-12, version 6.5.0* Please would it be possible to have the a gas product “SP22” which is a direct drop in for R22? Otherwise app is the mutts mutts 😎 Only reason for 1 star 🌟 is to maybe be noticed among the other reviews! Thanks Dan foss ### 1/5 — v. 6.4.0 crashes *2020-06-07, version 6.4.0* It crashes on iOS12.1.4, iPhone 8 Plus. ### 1/5 — App won’t open *2020-06-03, version 6.4.0* Unable to open app no more since I’ve done the previous update even on different phone and even tried deleting the app and reinstalling it, as soon as you open the app it shuts down straight away need to fix this ASAP really enjoyed using this app was very helpful until this happened ### 1/5 — Stuck on R134a *2017-11-17, version 3.7.0* Might need an update for current iOS. I can’t change refrigerant from R134a. ### 1/5 — Wot no R410a *2015-02-05, version 2.0.8* Now totally useless without R410a. What are you thinking of Danfoss. What a shambles..! ### 1/5 — Missing common refrigerants *2014-11-03, version 2.0.8* Why do all of the new versions on iPad and iPhone lack R404A and R22? Two of the most common refrigerants around. Otherwise it would be a five star product. ### 1/5 — Pointless *2014-09-03, version 2.0.8* Was brilliant until a recent update removed R410a and R407c. Now completely useless to me. Uninstalling ### 1/5 — Opinion *2014-07-12, version 2.0.6* I have to use bitzer app because slider app dont have R124a why dont add it to the list!! ### 1/5 — No longer lists Ammonia *2014-07-12, version 2.0.6* Why did they remove ammonia from the refrigerant list??????? ## Most praised reviews (10 highest-rated) ### 5/5 — Good App *2024-11-29, version 6.62.0.* I always use this app.But just now I cannot open it , why? I was use iphone 6s plus. ios version is 15.8.3 .please reply to me. ### 5/5 — Amazing App *2024-08-14, version 6.45.0* I just learned so many things by downloading it and taking a look at the app, unfortunately there is not alot of residential AC and it would be so helpful if there was more information about that too, like the troubleshooter but converted for Residential & Commercial. Overall is a great idea for an App like this that’s why 5 Stars ### 5/5 — Love it *2023-12-13, version 6.34.0* The best refrigeration and hvac app on the market hands down. A must have for any tech anywhere. ### 5/5 — HVAC *2021-11-03, version 6.17.0* Brilliant app 👍 ### 5/5 — I can no longer open this app *2020-05-21, version 6.3.0* I can no longer open this app. I do not know what is wrong but the app will not open. Help. ### 5/5 — Best PT chart app *2019-05-06, version 4.3.2* Very good support, I emailed from within the app for feature suggestion and they added it within 2 weeks!!! ### 5/5 — Best PT chart app! *2018-06-14, version 4.1.0* Best PT chart app available for iPhone and believe me I’ve tried them all. Easily slide through P&R and change between dew and bubble at the flip of a switch. Lots of refrigerants ### 5/5 — KISS *2015-06-25, version 3.3.0* Love the keep it simple layout. Clean, simple, clear. ### 5/5 — FIXED missing R's after update *2014-09-02, version 2.0.8* Remove & reinstall from phone fixed missing refrigerants (thanks for fast reply from support). Excellent program - has everything needed for field work. Minor issue: scrolling R's a little sluggish on selection list. ### 5/5 — Top notch *2014-08-04, version 2.0.6* Better that carrying a comparator around!! Easy to use. I use it every day --- *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 2026-08-25.*