Ezy Trigonometry is a friendly tool designed to help students understand trigonometry.

+ Interactive unit circle. Allows exploring relations between angles and trigonometric ratios.
+ Bundled with an exact trigonometric ratios table
+ Bundled with a hand book of trigonometric formulas
+ Flexible settings: radians / degrees, related angles, angle snapping
+ Full support for iPhone / iPad and retina display

* Tap & Hold to switch unit circle mode

What’s New

Version 1.1.1

+ Fixed the definition of cotangent. Thanks for pointing it out!

Ratings and Reviews

2.6 out of 5
43 Ratings

43 Ratings

H.V.Information ,

But if you don't know

I can't believe trig is hard. It's just presented in cryptic terms. 95% is trying to figure out the terminology. I'm sure this app would be great for someone who understands trig already. What was the authors purpose for the app? If it's teaching trig, it fails; if it's to make graphic demonstration in coded terms he should get 5. It's fun to move the arrow for a minute, that's about it for me.

RinkRat22 - 360 live ,

Awesome, just wish I had it sooner.

It's a great app, like I said I wish I had it sooner. While I already understand trig and do well in it these days, I was curious when I saw the app so I downloaded it and will now be keeping it. I was disappointed about 1 thing though, because I feel like anyone teaching trig should know this.

And this is on you Mr./Mrs. Developer, you need to rationalize the denominator when you represent values in fractions.

While tan pi/6 = 1/root3 may be correct in that it's the exact value, it is not simplified to the point where it would be correct on an exam. The correct way to represent this value is root3/3.

This is done, for those who want to learn, so that you get the square root out of the denominator which makes it easier you to do more complex calculations down the road. It is a habit that should be drilled into your education in trig.

I noticed the issue with tan, cot, sec, and csc for exact values on the unit circle. All of them have a denominator that isn't rationalized at some point on the unit circle.

Until this is fixed I will keep my review at 4 stars because while it's a great app, but it does have this error that wouldn't fly for a trig professor looking for simplified exact values.

Rationalizing square roots from the denominator is a simple process but it shouldn't be skipped for its simplicity by any means.

Kato_Pholustex ,


I've tried using this to help me with my homework, and I like the app because of its information; but it's lacking in its ability to find missing sides or reducing to simplistic form. It's frustrating! And I can't navigate through the app, it just shoved me in like someone walked over and handed me a protractor and said 'Here, this will help' and I don't know how it's supposed to help! Maybe expand the app a bit more and I'll redownload this.


Hoang Khanh Nguyen
5.1 MB

Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


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