# Math Duel vs FOSS eBooks

The clearest difference is rating: Math Duel at 4.5 against FOSS eBooks's 2.2. Math Duel also leads on review sentiment (64% vs 40%) and ratings volume (236 vs 57). FOSS eBooks's advantage is in-app purchases (none vs 1) and iOS requirement (9.0 vs 15.0). On price, update cadence, ads and monetization model there is nothing between them.

Both are free to download. Math Duel sells 1 one-off in-app purchase. FOSS eBooks asks for nothing beyond the download.

Math Duel holds the better App Store score, 4.5 against 2.2. Both are backed by a comparable volume of ratings — 236 and 57 respectively. Written reviews point the same way: 64% of Math Duel's written reviews are positive against 40% of FOSS eBooks's.

Math Duel ships an update every 6 weeks, FOSS eBooks every 2 months. The most recent releases landed on November 8, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Math Duel | FOSS eBooks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (236 ratings)](https://appshunter.io/ios/app/math-duel-multiplayer-battle/id495077699/reviews)** | [2.2 (57 ratings)](https://appshunter.io/ios/app/foss-ebooks/id1081851908/reviews) |
| Number of ratings | **236** | 57 |
| Positive reviews | **64.4% of reviews** | 40.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 86 MB | 139 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ellie's Games, LLC](https://appshunter.io/developer/355986115) | [Hurix Systems Pvt. Ltd.](https://appshunter.io/developer/429900405) |

## What reviewers say

### Math Duel

[App page](https://appshunter.io/ios/app/math-duel-multiplayer-battle/id495077699)

Engage in a fun, competitive math game for two players on a single device. Improve basic math skills and strategic thinking with customizable equations and modes. Ideal for classrooms or home practice, it encourages collaboration and personalized learning.

**Highlights:** Two-player split-screen mode, Single player practice, Customizable equations, Teacher-adjustable settings, Basic math skill improvement, Strategic thinking development

**Features:** macOS Compatibility, Family Sharing, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features | $4.99 | one-time |

**What reviewers like**

- 👍 Great for practicing math facts
- 👨‍👩‍👧‍👦 Good for family/classroom competition
- 💡 Customizable difficulty levels
- 🧠 Effective for mental math skills
- 🎮 Fun and engaging gameplay

**What reviewers complain about**

- 🐛 Frequent crashing issues
- 📉 Multiplication and division not working well for some
- 🔢 Increments of 10 instead of 1 for numbers
- 🚫 No option to focus on specific timestables
- ❌ Inability to change operations/differentiation as advertised

**Reported bugs**

- App keeps crashing
- Multiplication doesn't work well
- Division problems cannot be solved due to lack of decimal key
- Settings button resets score
- App freezes timer in single player when settings is pressed

**Requested features**

- Ability to focus on specific timestables
- Option to change operations and differentiation
- Support for older iPads
- Return to increments of 1 for numbers
- Add decimal point for division


### FOSS eBooks

[App page](https://appshunter.io/ios/app/foss-ebooks/id1081851908)

Access and read your FOSS educational eBooks offline with this interactive reader. Enjoy features like portrait/landscape viewing, thumbnail navigation, and listen to audio narration on supported titles.

**Highlights:** Offline eBook access, Portrait and landscape view, Thumbnail navigation, Audio narration on select products, Interactive learning

**In-app purchases:** none


## Frequently asked questions

### Is Math Duel free?

Math Duel is free to download, with in-app purchases available.

### Is FOSS eBooks free?

FOSS eBooks is free to download, with no in-app purchases.

### Which has better reviews, Math Duel or FOSS eBooks?

Math Duel is rated higher. Math Duel averages 4.5 out of 5 from 236 ratings, while FOSS eBooks averages 2.2 from 57 ratings.

### Do Math Duel or FOSS eBooks have ads?

Neither Math Duel nor FOSS eBooks shows ads.

### Which is updated more often, Math Duel or FOSS eBooks?

Math Duel ships an update every 6 weeks, and FOSS eBooks every 2 months. Most recently, Math Duel was updated on November 8, 2026 and FOSS eBooks on November 2, 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.*