iPhone Screenshots


Quickly and easily look up Dewey Decimal numbers.

• Browse and search
• Supports 10 languages
• No internet required

What’s New

Version 1.3

• When viewing a category, Decimator now shows the category's ancestors
• Updated visual appearance
• Added 64-bit compatibility

Ratings and Reviews

4.3 out of 5
3 Ratings

3 Ratings

Paul down the hall ,

Searchable Dewey!

I very much appreciate being able to search by topic or Dewey number. I've spent 30 years in libraries using the Library of Congress classification system, and am now re-learning the Dewey system. I could have used this app at work yesterday, but am happy to now have it in my toolkit. If this app was updated to be optimized for the iPad Retina display, I would give it 5 stars.

hc0123 ,

Good but needs updates

I love being able to look find the Dewey decimal number for certain topics for certain books but it needs to get more detailed. So many of my books are categorized under 813 or 823 but I know there is more after the decimal point. The app won’t tell me. I have to find other resources to tell me.

Hitting expert ,

Great! But Search function limited

Very handy while browsing at the library. Wish the search function would include more than just the official categories. For example, including 'cheetahs' instead of just mammals. Searching for 'cheetahs' should direct you to the mammals section instead of giving 'no results'


Kosada Incorporated
3.7 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2017 Kosada, Inc.


  • Family Sharing

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

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