iFormula - Your Own Calculator

This app has saved my lot time while designing inductors and transformer. Best and must app for engineers involved circuit design. The App developer should write user manual, which will help the user to kick start.

It was one of the best app on my iPhone 6 Plus. But after updating its only crashing . I lost all my formulas which is affecting my work. Please debug and update again as early as possible. Thanks Sudhir Padhye Update: 17/5/16 After update it's working fine. Thanks for prompt action.

A misleading option in the settings says one can unlock > 3 fraction digits with the upgrade. Maybe they're talking about input values alone, because I upgraded and all results are still rounding-off to the nearest whole number. This makes any number of input fraction digits kind of useless. Also, I'm using an iPhone 5 and if you access the Help '?' within a formula, you can't exit help. You have to restart the program and in the free version, lose your work. The close window sign is half-hidden in the top-left corner of the screen and trying to tap out anywhere else on the screen doesn't work either. You can't write formulae in this program like you would in handwriting. And the exponent function 'pow' is near-impossible to get to work. This means you have to work with a LOT of brackets and multiplications. Say to write out the solution for 'x' in a quadratic equation (the solution as written by hand has no brackets), you would need five sets of brackets. It can get tricky but the red highlighting to denote error helps and one gets used to the flood of brackets soon enough anyway. With these issues, perhaps not a good buy, but definitely good for a try

Its just so simply awesome. Any type of formula you can customise & use it like excel. Simple to use . Its worth .

I purchased this app because I am in the directional drilling industry. I was able to write some of the common formulas that I use every day into it and so far it is working great! Anyone who uses angles like co-sign, sine and tangent formulas should know you have to write the angle and then convert to radiaons. Us tang(angle*PI/180) it’ll work well. Very good so far and exactly what I needed. A variable based formula saver.

Formulas can be created, but not functional.

I was using this app and THREE things made be delete it. 1. It asks a bunch of stuff at the beginning and even to upgrade to v 2.5. Wouldn't we already have that? 2. The question mark tells you how to make a formula, but you can't get out causing you to have to get out of the app and get back on, WHICH CAUSES YOU TO LOSE ALL OF YOUR PROGRESS. 3. The formula maker only shows 1 input field/constant field. Not helpful at all. Please fix this stupid app.

Does everything you need to write your own formulas.

Buggy, fix updates

This was a five star app until the latest update. The redesigned UI is terrible, clumsy, and confusing. It won't let me restore my purchase to remove ads. It deleted all the custom formula calculators I made using the previous version. It's useless now. Please fix it...like it was!!