# NotanIzer

> Image analysis tool for light and dark element composition in art. (iPhone/iPad app by bigpantsgroup LLC.)

- Source: https://appshunter.io/ios/app/notanizer/id1169086981 (this page in markdown: same URL + `.md`)
- Developer: [bigpantsgroup LLC](https://appshunter.io/developer/315959079)
- Category: Photo & Video, Productivity
- Price: $1.99
- Rating: 4.40/5 from 98 App Store ratings · 44 written reviews indexed
- Age rating: 4+
- Requires: iOS 17 · 30 MB
- Languages: American English
- Released: 2016-11-11
- Data updated: 2026-09-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/notanizer/id1169086981/reviews.md

## What is NotanIzer?

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 into black and white with colors above the set value being white and those below being black. 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 so the artist can focus on the structure and design of the image.

The next 3 functions are Levels. They set either 3, 4, or up to 10 levels of color spread over black, gray and white pallets. The 3 and 4 levels have sliders to adjust where those levels are while the Levels function just evenly divides the image by the number of levels.

Finally the last function is Slice.  It allows you to select a small range of values and highlight those in black and everything else white.

And as of version 3.1 you can now invert the display of each of the filters. Lighter values have been displayed in white, but now you can invert them to see those in black which can really help bring out detail.


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.

## Key features

- Black and white conversion with adjustable threshold
- Grayscale and color display modes
- Multi-level color palette generation (3, 4, 10 levels)
- Adjustable level sliders
- Slice function to highlight value ranges
- Invert filter display option
- Image sharing capabilities

## Chart rankings

- #53 in Top Paid · Photo & Video (US App Store)

## Recent user reviews (10 of 44)

All indexed reviews: https://appshunter.io/ios/app/notanizer/id1169086981/reviews.md

### 5/5 — Greatest

*2026-03-11*

Amazing tool making my artwork vibrantly clear.

### 5/5 — Great app for converting images to posterized version.

*2026-03-02*

I use this app to convert photographs to a posterized version for using with gel printing.

**Developer response:** I am always surprised by the way people use our apps. Glad it’s working for you!

### 5/5 — Yes

*2026-01-28*

i don’t use it to paint (necessarily) i just dig the images it creates. Bravo!

### 5/5 — Wessex artist

*2025-12-05*

A useful tool for serious or fun art

### 5/5 — Simple and brilliant

*2025-08-17*

I take many art classes and they always recommend this app, so you had to something right.

### 1/5 — How do i remove app

*2025-08-11, version 3.1*

How do I remove this app from my apps? I do not want to pay a monthly fee for this. There’s no way to remove it. Please let me know.

### 5/5 — Great Artist Utility App

*2025-08-10*

Love that it just works and there are no micro transactions. Easy to use interface. whats the deal with that sound effect? seems like there could be a better way to indicate that level limit has been reached.

### 2/5 — Why?

*2025-07-30, version 3.01*

I paid for this app, why are you stamping your watermark on my prints?

### 5/5 — Great for artists

*2025-07-26*

So easy to use and so helpful.

### 5/5 — Nice Little Helper

*2025-06-19*

Perfect for my needs! The best way to work out the lights and darks for a strong composition.

## Frequently asked questions about NotanIzer

### What does NotanIzer do?

NotanIzer is an application designed to help artists analyze the interplay of light and dark elements within their images, a concept known as Nōtan. It provides tools to visualize image structure and enhance details by manipulating color values.

### What are the key features of NotanIzer?

Key features include converting images to black and white with an adjustable threshold, displaying images in grayscale or color to focus on structure, creating multi-level color palettes (3, 4, or 10 levels) with adjustable sliders, a 'Slice' function to highlight specific value ranges, and the ability to invert filter displays to reveal hidden details. It also allows for image sharing.

### Is NotanIzer free to use?

Yes, based on the provided information, NotanIzer is available for free. There are no mentions of in-app purchases or advertisements, suggesting a completely free user experience.

### Who would benefit from using NotanIzer?

Any artist or designer who works with visual composition would benefit from NotanIzer. It is particularly useful for those who want to understand and refine the balance of light and dark elements in their artwork, photography, or digital designs.

### How can NotanIzer help with image composition?

By simplifying images into black and white, grayscale, or distinct color levels, NotanIzer allows artists to see the underlying structure and value relationships more clearly. This helps in identifying areas that might be lost in complex imagery and making informed decisions about composition and design.

## Version history (last 5 releases)

### 3.2 — 2026-02-26

Restored cloud syncing between devices
UI Updates for OS 26

### 3.1 — 2025-03-03

- Invert - You cannot invert the display of the filters. Previously values less than the the setting on the slider would be colored black or gray depending on the filter you used and values above the slider would be lighter gray or white. Now selecting invert will draw the colors the opposite.

-Slice - Slice allows you to select a specific band of values and highlight only that value in black and everything else will be white.

### 3.01 — 2024-03-04

-Fixed drag and drop bug on iPads
-Completed multiple project deletion

### 3.00 — 2023-06-14

Multi Project support! Easily switch between your current project and another one.
A host of other optimizations including better printing.

### 2.21 — 2021-05-10

Optimized use of the Photo library and user permissions.

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## More apps by bigpantsgroup LLC

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All apps by bigpantsgroup LLC: https://appshunter.io/developer/315959079

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-05.*