Nōtan is a Japanese design concept involving the play and placement of light and dark elements next to the other in the composition of art and imagery. The Yin Yang symbol is an example of this design philosophy. The use of Nōtan in art composition is a powerful tool to help the artist identify the structure of the light and dark portions of the image they want to incorporate into their project.

The first function simply divides the image at 50% of bright/dark. You can then use the slider to move that line to enhance detail that may otherwise be obscured.

The second and third functions displays the image in either a grayscale or color palette so the artist can focus on the structure and design of the image.

The last function is Levels. Use the slider to set from 3-10 preset levels for even finer grains of the different light/dark areas of your image.

And of course, share your image in many ways.

Any artist will benefit from seeing their work in a different light. NotanIzer is that light.

What’s New

Version 1.8

Thanks to our awesome users, back by popular demand, we brought back in the separate 3 and 4 level function with sliders.

Ratings and Reviews

4.8 out of 5
13 Ratings

13 Ratings

Tom b-d ,

Good tool

Really handy for value studies on reference photos—being able to toggle between 2, 3, and 4 value ranges AND b&w rendition allows thorough analysis of shapes.

colleencaub ,


Its easy straightforward, works its fast elegant controls

dbonneville ,

Brilliant simple app!

Perfect app for breaking down an image into a simplified set of forms. I totally love it. So simple. So brilliant.


Irons and Co. LLC
2.6 MB
Photo & Video

Requires iOS 10.3 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© bigpantsgroup


  • Family Sharing

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

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