Permutation and Combination vs ABCD Cards
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Permutation and Combination
Easily calculate permutations and combinations with this educational tool. It provides a straightforward way to solve mathematical problems related to arrangements and selections.
- Calculate permutations
- Calculate combinations
- Easy to use interface
- Educational tool
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This application can calculate permutation and combination easily.
ABCD Cards
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.
- Digital polling tool
- Paper-free Q&A
- Quick answer display
- Class consensus view
- Simple interface
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The ABCD Cards app can be used in an educational setting as a polling/Q&A tool and as an alternate to the conventional paper ABCD card method. The simple interface provides students with a paper-free way to easily display an answer to an instructor's question and for the instructor to quickly look across the room for the general consensus of answers. Clicking on a letter/color fills the screen with that letter/color; clicking again brings you back to the main screen. ABCD Cards was created by the Center for Instructional Innovation & Assessment at Western Washington University (WWU). Updated 2023.
Screenshots
Verdict
Permutation and Combination and ABCD Cards both sit at 4.1 stars, but that hides the real split: 100% of ABCD Cards's written reviews are positive against 44% of Permutation and Combination's. Permutation and Combination's advantage is iOS requirement (12.1 vs 15.0). On price, rating, ratings volume and update cadence there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Permutation and Combination holds the better App Store score, 4.1 against 3.9. Both are backed by a comparable volume of ratings — 13 and 31 respectively. Written reviews complicate that: 44% of Permutation and Combination's written reviews are positive against 100% of ABCD Cards's, so the app with the better star average is not the one people write more warmly about.
Both ship on a similar rhythm, roughly every 40 months. The most recent releases landed on September 10, 2026 and September 9, 2026 respectively.
| Parameter | Permutation and Combination | ABCD Cards |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (13 ratings) — better | 3.9 (31 ratings) |
| Positive reviews | 44.4% of reviews | 100.0% of reviews — better |
| Number of ratings | 13 | 31 — better |
| Update frequency | Every 40 months | Every 40 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 12.1 — better | 15.0 |
| Further details — not scored | ||
| Size | 23 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Keiji Matsui | Western Washington University |
Customer experience
Permutation and Combination
ABCD Cards
In-app purchases
Permutation and Combination
No in-app purchases
ABCD Cards
No in-app purchases
Questions
Is Permutation and Combination free?
Is ABCD Cards free?
Which has better reviews, Permutation and Combination or ABCD Cards?
Do Permutation and Combination or ABCD Cards have ads?
Which is updated more often, Permutation and Combination or ABCD Cards?
Other comparisons
