Convex is a revolutionary stylish converter for your iPhone, iPod Touch and iPad.

Convex is SMART!

Convex is so smart, it understands you! Just type any conversion and get the result immediately for over 950 units for 20 categories.

Convex is the first converter that gets you by letting you type conversion naturally, in you own words. This makes Convex the fastest converter there is!

You know what you want to convert, just type it! Convex's natural processing engine does the work for you. You're 5ft 10? Just type that (don't even mention the inches), Convex will figure it out and will even offer a smart default conversion to metric.

Convex is FUN!

Who said conversions had to be a chore?

Convex transforms any conversion into an educational and fun experience. Amazing animations and cool sounds provide a new fun immersive experience that allows you to learn and enjoy conversions!

You can immediately change the value to be converted by simply moving or taping your finger up or down, left or right on the animation.

More information on

What's New

Version 1.9

✔ Added custom URL scheme support so that Convex can be used by other iOS apps too

✔ Added new units, supporting over a 1000 units now!

✔ Fixed a bug that could result in a crash when Convex came back to the foreground

✔ Fixed a bug with custom keyboard bar that did result in very slow touch speed under certain conditions

✔ Fixed a bug with Voice input (iPhone 4S, iPhone 5, iPad 3, iPad retina)

✔ Improved stone conversion (7.4 stone is definitely not the same as 7 stones 4 (pounds))

Ratings and Reviews

4.5 out of 5

8 Ratings

8 Ratings



What a wonderful UI! Natural language, quick keys, visual adjustments in both ways, with visual and audio feedback. Has a huge collection of units, but they don't get in the way of getting the task done.

Please Update the App.

J. James

Great App, with a great UI. Please update the app to be used in the future.


Eng. Kareem

Good App and so nice view and design


Ergonotics Sas
35.5 MB
Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch.
English, French
Age Rating
Rated 4+
Copyright © 2011-2013, Ergonotics SAS. All rights reserved.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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