# Subtraction Math vs Classroom Fluency Timer

The clearest difference is price: Classroom Fluency Timer at Free against Subtraction Math's $1.99. Classroom Fluency Timer also leads on iOS requirement (8.0 vs 15.0). Subtraction Math's advantage is rating (3.9 vs 1.0) and ratings volume (7 vs 1). On update cadence, ads and in-app purchases there is nothing between them.

Classroom Fluency Timer is free to download; Subtraction Math costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Subtraction Math holds the better App Store score, 3.9 against 1.0. That said, the two scores are not equally well evidenced: Subtraction Math has 7 ratings behind it against 1, so its average is the more settled of the two.

Subtraction Math ships an update every 4 months, Classroom Fluency Timer every 5 months. The most recent releases landed on September 22, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Subtraction Math | Classroom Fluency Timer |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[3.9 (7 ratings)](https://appshunter.io/ios/app/subtraction-math-ibbleobble/id978343612/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/classroom-fluency-timer/id1104853948/reviews) |
| Number of ratings | **7** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 5 months |
| Monetization | Paid | **Free** |
| Size | 17 MB | 15 MB |
| Requires iOS | 15.0 | **8.0** |
| Devices | **iPhone, iPad, iPod, Mac, Apple TV** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KidDotCo](https://appshunter.io/developer/819246599) | [Jeff Holtzkener](https://appshunter.io/developer/1087693055) |

## What reviewers say

### Subtraction Math

[App page](https://appshunter.io/ios/app/subtraction-math-ibbleobble/id978343612)

This educational game helps children aged 5-8 practice subtraction skills through engaging drills and multiple-choice questions. It offers a flexible learning pace with an optional timer and vibrant visuals to make arithmetic fun.

**Highlights:** Subtraction drills, Multiple choice format, Adjustable difficulty, Optional timer, Colorful graphics and sounds, Universal purchase

**Features:** iMessage stickers

**In-app purchases:** none


### Classroom Fluency Timer

[App page](https://appshunter.io/ios/app/classroom-fluency-timer/id1104853948)

This educational tool offers a flexible timer for classroom use, allowing educators to adjust time discreetly during activities. It features both a standard countdown mode and a specialized fluency timer designed for structured speaking exercises.

**Highlights:** Fudgeable timer for flexible time adjustments, Gesture controls for discreet time modification, Standard countdown timer mode, Specialized Fluency Timer for 4/3/2 activity, Customizable segment number and length

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

**In-app purchases:** none


## Frequently asked questions

### Is Subtraction Math free?

Subtraction Math costs $1.99, with no in-app purchases.

### Is Classroom Fluency Timer free?

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

### Which has better reviews, Subtraction Math or Classroom Fluency Timer?

Subtraction Math is rated higher. Subtraction Math averages 3.9 out of 5 from 7 ratings, while Classroom Fluency Timer averages 1.0 from 1 ratings.

### Do Subtraction Math or Classroom Fluency Timer have ads?

Neither Subtraction Math nor Classroom Fluency Timer shows ads.

### Which is updated more often, Subtraction Math or Classroom Fluency Timer?

Subtraction Math ships an update every 4 months, and Classroom Fluency Timer every 5 months. Most recently, Subtraction Math was updated on September 22, 2026 and Classroom Fluency Timer on September 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.*