# Permutation and Combination — user reviews > 9 indexed App Store user reviews of Permutation and Combination by Keiji Matsui, rated 4.10/5 from 13 ratings. - Source: https://appshunter.io/ios/app/permutation-and-combination/id1006634963/reviews - App overview in markdown: https://appshunter.io/ios/app/permutation-and-combination/id1006634963.md - Rating breakdown: 5★ 8 · 4★ 0 · 3★ 3 · 2★ 2 · 1★ 0 ## Most critical reviews (9 lowest-rated) ### 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 ### 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 — 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). ### 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