# Subtraction School ! ! vs ClassTimer

The clearest difference is review sentiment: Subtraction School ! ! at 50% against ClassTimer's 0%. Subtraction School ! ! also leads on rating (5.0 vs 2.0). ClassTimer's advantage is ads (none vs shown) and price ($1.99 vs $4.99). On ratings volume, update cadence, in-app purchases and monetization model there is nothing between them.

Subtraction School ! ! costs $4.99 and ClassTimer $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Subtraction School ! ! holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 50% of Subtraction School ! !'s written reviews are positive against 0% of ClassTimer's.

Subtraction School ! ! ships an update every 12 months, ClassTimer every 14 months. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Subtraction School ! ! | ClassTimer |
| --- | --- | --- |
| Price | $4.99 | **$1.99** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/subtraction-school/id447548515/reviews)** | [2.0 (2 ratings)](https://appshunter.io/ios/app/classtimer/id493088052/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 12 months** | Every 14 months |
| Monetization | Paid | Paid |
| Size | 13 MB | 19 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPad, Mac, Apple TV |
| Age rating | 4+ | 4+ |
| Developer | [Horizon Business, Inc.](https://appshunter.io/developer/431586531) | [Ventura Educational Systems](https://appshunter.io/developer/371324172) |

## What reviewers say

### Subtraction School ! !

[App page](https://appshunter.io/ios/app/subtraction-school/id447548515)

Master subtraction with this educational app. It offers practice from single-digit to multi-digit problems, with guided tutorials and hints to help users learn step-by-step.

**Highlights:** 1 to 6 digit problems, Random or custom problems, Tutorial animation speed, Step-by-step solution guide, Hint button for guidance, Help button for step completion

**Features:** macOS Compatibility

**In-app purchases:** none


### ClassTimer

[App page](https://appshunter.io/ios/app/classtimer/id493088052)

This app helps students develop essential time management skills with visual timers and customizable alerts. It supports various display formats and sounds to aid understanding and productivity in educational settings.

**Highlights:** Visual time display, Bar graph indicator for remaining time, Selectable buzzer sounds, Hours/minutes or minutes/seconds display, Start, stop, pause, and restart functions, Sound on/off control

**In-app purchases:** none


## Frequently asked questions

### Is Subtraction School ! ! free?

Subtraction School ! ! costs $4.99, with no in-app purchases.

### Is ClassTimer free?

ClassTimer costs $1.99, with no in-app purchases.

### Which has better reviews, Subtraction School ! ! or ClassTimer?

Subtraction School ! ! is rated higher. Subtraction School ! ! averages 5.0 out of 5 from 2 ratings, while ClassTimer averages 2.0 from 2 ratings.

### Do Subtraction School ! ! or ClassTimer have ads?

Subtraction School ! ! shows ads; ClassTimer does not.

### Which is updated more often, Subtraction School ! ! or ClassTimer?

Subtraction School ! ! ships an update every 12 months, and ClassTimer every 14 months. Most recently, Subtraction School ! ! was updated on November 6, 2026 and ClassTimer on November 1, 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.*