# Permutation and Combination > App for calculating permutations and combinations. (iPhone/iPad app by Keiji Matsui.) - Source: https://appshunter.io/ios/app/permutation-and-combination/id1006634963 (this page in markdown: same URL + `.md`) - Developer: [Keiji Matsui](https://appshunter.io/developer/365287272) - Category: Education, Utilities - Price: Free - Rating: 4.10/5 from 13 App Store ratings · 9 written reviews indexed - Age rating: 4+ - Requires: iOS 12.1 · 23 MB - Languages: American English - Released: 2015-06-25 - Data updated: 2026-06-04 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/permutation-and-combination/id1006634963/reviews.md ## What is Permutation and Combination? This application can calculate permutation and combination easily. ## Key features - Calculate permutations - Calculate combinations - Easy to use interface - Educational tool ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/permutation-and-combination/id1006634963/reviews.md ### 1/5 — App stopped working *2025-11-05, version 2.1* This app worked beautifully on my iPhone 14, but now that I upgraded to iPhone 17, it has stopped working. The two bars where you choose n and k no longer display the numbers. I can hear the sound when I scroll down but no numbers appear ### 3/5 — FOR PEOPLE HAVING THE INVISIBLE NUMBERS *2025-02-06, version 2.1* all you have to do is turn off dark mode ### 3/5 — This was a 5 star app until the last update *2022-05-13, version 2.1* This was a great little app, but on the last update, the scroll inputs (from and choose input numbers) are now blank. The results still show but I have to blindly attempt to change the inputs until the output looks correct. It was 5 stars before before that (and it may work for you... but if you update the iOS, Apple purposely kills your battery life to get you to buy a newer phone). ### 2/5 — Great until update *2022-03-07, version 2.1* Up until i had to update my software this was my go to program for determining P&C but now the scroll bars are invisible AND the final results are invisible as well. Please fix! ### 3/5 — It’s broken *2022-03-04, version 2.1* Currently not working for iPhone X newest OS ### 5/5 — Ok its still working for a few weeks *2019-12-07* Easy to use but still i want to see the step cuz my teacher consider short cut but wheb he ask about how did it i cant show how you know but still great app thanks for passed weeks