# Permutation and Combination vs ABCD Cards

The clearest difference is review sentiment: ABCD Cards at 100% against Permutation and Combination's 44%. ABCD Cards also leads on rating (4.0 vs 3.7). Permutation and Combination's advantage is iOS requirement (12.1 vs 15.0). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ABCD Cards holds the better App Store score, 4.0 against 3.7. Both are backed by a comparable volume of ratings — 15 and 32 respectively. Written reviews point the same way: 44% of Permutation and Combination's written reviews are positive against 100% of ABCD Cards's.

Both ship on a similar rhythm, roughly every 40 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Permutation and Combination | ABCD Cards |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (15 ratings)](https://appshunter.io/ios/app/permutation-and-combination/id1006634963/reviews) | **[4.0 (32 ratings)](https://appshunter.io/ios/app/abcd-cards/id1212769036/reviews)** |
| Number of ratings | 15 | **32** |
| Positive reviews | 44.4% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 40 months | Every 40 months |
| Monetization | Free | Free |
| Size | 23 MB | 1 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Keiji Matsui](https://appshunter.io/developer/365287272) | [Western Washington University](https://appshunter.io/developer/855315644) |

## What reviewers say

### Permutation and Combination

[App page](https://appshunter.io/ios/app/permutation-and-combination/id1006634963)

Easily calculate permutations and combinations with this educational tool. It provides a straightforward way to solve mathematical problems related to arrangements and selections.

**Highlights:** Calculate permutations, Calculate combinations, Easy to use interface, Educational tool

**Features:** macOS Compatibility

**In-app purchases:** none


### ABCD Cards

[App page](https://appshunter.io/ios/app/abcd-cards/id1212769036)

This app offers a digital alternative to traditional paper ABCD cards for educational polling and Q&A. It allows students to easily display their answers and instructors to quickly gauge class consensus in a paper-free environment.

**Highlights:** Digital polling tool, Paper-free Q&A, Quick answer display, Class consensus view, Simple interface

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Permutation and Combination free?

Permutation and Combination is free to download, with no in-app purchases.

### Is ABCD Cards free?

ABCD Cards is free to download, with no in-app purchases.

### Which has better reviews, Permutation and Combination or ABCD Cards?

ABCD Cards is rated higher. Permutation and Combination averages 3.7 out of 5 from 15 ratings, while ABCD Cards averages 4.0 from 32 ratings.

### Do Permutation and Combination or ABCD Cards have ads?

Neither Permutation and Combination nor ABCD Cards shows ads.

### Which is updated more often, Permutation and Combination or ABCD Cards?

Permutation and Combination ships an update every 40 months, and ABCD Cards every 40 months. Most recently, Permutation and Combination was updated on October 24, 2026 and ABCD Cards on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*