# Add Up Fast vs Instrument Sounds

The clearest difference is review sentiment: Add Up Fast at 58% against Instrument Sounds's 0%. Add Up Fast also leads on rating (3.8 vs 3.0) and ratings volume (75 vs 4). Instrument Sounds's advantage is in-app purchases (none vs 3) and update cadence (every 6 weeks vs every 38 months). On price, ads and device support there is nothing between them.

Both are free to download. Add Up Fast sells 3 one-off in-app purchases. Instrument Sounds asks for nothing beyond the download.

Add Up Fast holds the better App Store score, 3.8 against 3.0. That said, the two scores are not equally well evidenced: Add Up Fast has 75 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 58% of Add Up Fast's written reviews are positive against 0% of Instrument Sounds's.

Add Up Fast ships an update every 38 months, Instrument Sounds every 6 weeks. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Add Up Fast | Instrument Sounds |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (75 ratings)](https://appshunter.io/ios/app/add-up-fast-multiplication/id1028942265/reviews)** | [3.0 (4 ratings)](https://appshunter.io/ios/app/instrument-sounds-learn-quiz/id6473613607/reviews) |
| Number of ratings | **75** | 4 |
| Positive reviews | **58.3% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 6 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 12 MB | 22 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Arch Square](https://appshunter.io/developer/432278777) | [Bang Vu](https://appshunter.io/developer/1136187265) |

## What reviewers say

### Add Up Fast

[App page](https://appshunter.io/ios/app/add-up-fast-multiplication/id1028942265)

Test your mental math skills with quick, 15-second challenges. Tap the correct answer to progressively harder equations to boost your brain power. Features four distinct game modes for varied practice.

**Highlights:** 15-second speed challenges, Tap correct answer mechanic, Progressively harder questions, Addition mode, Subtraction mode, Multiplication mode, Division mode

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pack of 250 Tokens | $0.99 | one-time |
| Pack to Unlock All Game Modes | $1.99 | one-time |
| Pack to Remove Ads | $1.99 | one-time |


### Instrument Sounds

[App page](https://appshunter.io/ios/app/instrument-sounds-learn-quiz/id6473613607)

Explore over 100 musical instruments with high-quality audio and engaging quizzes. Learn about their history and cultural significance through an easy-to-use interface. Perfect for music lovers of all levels.

**Highlights:** Over 100 instruments, High-quality audio, Interactive quizzes, Instrument history and culture, User-friendly interface, Beginner and enthusiast friendly

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

**In-app purchases:** none


## Frequently asked questions

### Is Add Up Fast free?

Add Up Fast is free to download, with in-app purchases available.

### Is Instrument Sounds free?

Instrument Sounds is free to download, with no in-app purchases.

### Which has better reviews, Add Up Fast or Instrument Sounds?

Add Up Fast is rated higher. Add Up Fast averages 3.8 out of 5 from 75 ratings, while Instrument Sounds averages 3.0 from 4 ratings.

### Do Add Up Fast or Instrument Sounds have ads?

Neither Add Up Fast nor Instrument Sounds shows ads.

### Which is updated more often, Add Up Fast or Instrument Sounds?

Add Up Fast ships an update every 38 months, and Instrument Sounds every 6 weeks. Most recently, Add Up Fast was updated on October 22, 2026 and Instrument Sounds on October 24, 2026.

---

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