Math Duel vs FOSS eBooks
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Math Duel
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.
- Two-player split-screen mode
- Single player practice
- Customizable equations
- Teacher-adjustable settings
- Basic math skill improvement
- Strategic thinking development
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Math Duel - 2 Player Math Game Challenge a friend or go solo! Math Duel is the ultimate split-screen math game for kids, students, and classrooms. Two players compete head-to-head on the same device, making math practice fast, fun, and competitive. Perfect for Schools and Home Learning. Used by teachers worldwide, Math Duel turns math drills into exciting duels. Customize difficulty for each player independently, ideal for differentiated instruction and personalized learning. Why Kids and Teachers Love Math Duel: - 1 or 2 players on one device, no extra hardware needed - Split-screen mode built for tablets and phones - Customizable equations for addition, subtraction, multiplication and division - Adjustable difficulty per player, great for mixed-ability classrooms - Positive reinforcement keeps students motivated - Frustration-free design for all skill levels - Trusted with over 1 million games played Built for the Classroom, Fun Enough for Home. Whether it's math fact fluency practice, a classroom warm-up, or friendly competition at home, Math Duel makes arithmetic engaging for all ages. Students sharpen mental math skills without even realizing they're learning. Great for: - Elementary and middle school students - Teachers looking for EdTech tools - Parents seeking educational games for kids - Homeschool families Have a feature idea? Share it directly with Erik, the developer, from inside the app!
FOSS eBooks
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.
- Offline eBook access
- Portrait and landscape view
- Thumbnail navigation
- Audio narration on select products
- Interactive learning
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FOSS eBooks is an interactive eBook reader app for users of FOSS (Full Option Science System) educational products. With FOSS eBooks you can: ・Download your FOSS eBooks and access them offline, where and when you choose ・Select portrait or landscape view with thumbnail-based navigation ・Listen to audio of the text on select products
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Math Duel | FOSS eBooks |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (236 ratings) — better | 2.2 (57 ratings) |
| Positive reviews | 64.4% of reviews — better | 40.0% of reviews |
| Number of ratings | 236 — better | 57 |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 86 MB | 139 MB |
| Age rating | 4+ | 4+ |
| Developer | Ellie's Games, LLC | Hurix Systems Pvt. Ltd. |
Customer experience
Math Duel
FOSS eBooks
Bugs and requests
Math Duel
Reported bugs
8 issues- 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
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- Division rounds down, teaching incorrect math
- Paid app contains ads
- App keeps cutting off
Requested features
14 requests- 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
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- Option to give both opponents the same problems
- Button to go back to menu
- Button to restart in menu
- Option for number of questions to win
- Pause or stop button
- Online mode
- Ability to disable sound
- Round to the tenths place
- Spinner for difficulty control
FOSS eBooks
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Math Duel
- Unlock All Features$4.99
FOSS eBooks
No in-app purchases
