# Pure Flashcards Subtraction vs PBS Classroom

The clearest difference is price: PBS Classroom at Free against Pure Flashcards Subtraction's $0.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

PBS Classroom is free to download; Pure Flashcards Subtraction costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 12 months. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Pure Flashcards Subtraction | PBS Classroom |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | Every 12 months |
| Monetization | Paid | — |
| Size | 0 MB | 18 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [T&T United Inc.](https://appshunter.io/developer/468282934) | [Kanako Otsui](https://appshunter.io/developer/1491099559) |

## What reviewers say

### Pure Flashcards Subtraction

[App page](https://appshunter.io/ios/app/pure-flashcards-subtraction/id933588107)

This app offers a focused flashcard experience for learning subtraction facts. It features 126 cards covering various subtraction ranges, presented randomly for repeated practice. Designed for both classroom and home use, it requires no internet or sign-up.

**Highlights:** 126 subtraction flashcards, Random card order, Offline access, No sign-up required, Classroom and home use, Simple two-tap start

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

**In-app purchases:** none


### PBS Classroom

[App page](https://appshunter.io/ios/app/pbs-classroom/id1491099560)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pure Flashcards Subtraction free?

Pure Flashcards Subtraction costs $0.99, with no in-app purchases.

### Is PBS Classroom free?

PBS Classroom is free to download, with no in-app purchases.

### Do Pure Flashcards Subtraction or PBS Classroom have ads?

Neither Pure Flashcards Subtraction nor PBS Classroom shows ads.

### Which is updated more often, Pure Flashcards Subtraction or PBS Classroom?

Pure Flashcards Subtraction ships an update every 12 months, and PBS Classroom every 12 months. Most recently, Pure Flashcards Subtraction was updated on November 1, 2026 and PBS Classroom on November 7, 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.*