Units - Free Unit Converter 4+

I like the layout because it shows all the conversions in one view and i can adjust which ones I want to see in the table. I would like to see more options, however; for example, “cubic feet per second” and “acre-feet” are common in hydrology in the US (good to add metric alternatives such as “cubic meters per second”).

I have been using the iPhone since the first model was released, and this app is one of the first I installed when the App Store opened to third party developers. I've consistently used it since then, and over the years it's become the only app I use for any conversions. Currency is great for travel and online shopping, and all the other conversions will come in handy at the most unexpected times. It's also useful to have the ruler for getting a rough idea of size. (I'm not good at visualizing 3", for example.)

This app had some technical issues a while back, but they seem to be resolved. Despite this app not having an update since 2015, it still works great on my 6S+ running the most current OS. I hope the developer hasn't abandoned the app, because I've never found one that's so simple, comprehensive and affordable. I'm keeping my fingers crossed that they'll come back if needed. Until the app is definitely abandoned and no longer working, I highly recommend this app. It's been on the main screen of every single iPhone I've owned

This is one fantastic app. It can convert almost any measurement that one can think of (I.e. Do you know how many cubic inches your new 3.0 liter car engine is?) This app will figure it out for you long before you can begin to find the formula. Best of all, it's totally FREE!

Since I first wrote the above review, I still find this to be one of if not the best and most useful apps ever offered. IT'S TOTALLY FREE & it really works on most any conversion that most can think of. If you paid for another "Conversion App" then you OVERPAID! I haven't found any app that works as well or is as easy to use as this one. Do yourself a huge favor and download it right away. You will find yourself using it often. To the writers of this app I wish to say, "Many thanks for a most useful, accurate, and free app!"