Sentence Builder Master Pro vs (Open Source) Mental Math
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sentence Builder Master Pro
Learn English grammar and vocabulary by unscrambling words to form correct sentences. This educational game offers multiple difficulty levels and a fun way to improve language skills for learners of all ages. Compete with others or play solo to master sentence structure and idioms.
- Word unscrambling for sentence formation
- Multiple difficulty levels (Beginner to Expert)
- Proverbs and Sayings level for idioms
- Online multiplayer mode
- Game Center integration
- Time penalties for incorrect order
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Play and learn English grammar, vocabulary and sentence structure by ordering the words to form correct sentences and sayings. Sentence Master is a fun and educational game for kids and English language students of all ages who want to learn and improve their language skills in a more entertaining way. How do you play? It’s easy. The game consists of putting the scrambled words from each level in order to form a correct sentence. (Beginner, skilled, professional, expert, sayings.) If you make a mistake and click the English Word in the incorrect order, there is a time penalty. Once you have completed the sentence you will receive a score based on how fast you were and your total number of errors. You can share your knowledge with other players worldwide thanks to online multiplayer mode or with your friends on Game Center. Are you an English student who wants to improve your skills? Sentence Master will help you organize the words in your sentences correctly. Are you an English expert who wants to show off your skills? Prove it in Competition mode on Game Center. Sentence Master is the first game of its kind designed and developed completely by educators to help students eliminate the most common mistake among English language learners, correct word order. With four levels from beginner to expert, Sentence Master is a challenge for everyone from the Beginner to the most seasoned English language communicators. The Proverbs and Sayings level is a great way to learn and remember popular English idioms and expressions. These are the levels: Beginner: Ideal for children. This level contains the easiest sentences with the fewest words to unscramble. Skilled: This is where things start to get harder. This level is great for adults who are beginning their English language learning adventure. Professional: Great for users with a solid base in English who want to keep their skills up to date. Expert: Only for those with the most proficient English skills. Are you one of them? Proverbs and Sayings: Every language has its idioms and expressions. Learning the refrains of the language of Shakespeare has never been so fun. Do you have what it takes to become the next Sentence Master? Try your luck in single player mode or against friends and other players worldwide. Learn English with a smile on your face.
(Open Source) Mental Math
This application offers a free, open-source platform for practicing mental arithmetic. It features timed tests, custom drills, and a comprehensive library of mental math tricks. All content is available offline without ads or paywalls.
- Timed arithmetic tests
- Customizable drills
- Mental math tricks library
- Offline progress tracking
- Multiple operation types
- Fast session interface
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A free, open-source mental math trainer. No ads, no paywalls, no locked content — every exercise and difficulty is included. Sharpen your arithmetic with quick timed tests, custom drills, and a library of mental-math tricks. Everything runs offline and your progress stays on your device. FEATURES Timed Tests A daily 60-second challenge plus sprints, a two-minute marathon, per-operation tests, and a hard mixed test — each with best scores. Custom Trainer Pick a number domain (Times tables, Natural, Decimal, Money, Huge), choose one or more exercises, and set per-exercise difficulty from Easy to Super hard. All the Operations Addition, subtraction, multiplication, division, squares, square roots, fractions, percentages, and modulo. Mental Math Tricks Dozens of step-by-step tricks for faster addition, subtraction, multiplication, division, and squares — with worked examples and favorites. Progress Tracking Solved totals, accuracy, best run, daily streak, longest streak, and a weekly activity view. Fast Sessions An on-screen keypad with instant answer checking, haptics, and sound. No ads. No paywalls. No account required. 100% Open Source The complete source code is public - see it, audit it, or contribute at https://github.com/Open-Apps-Studio/mental-math
Screenshots
Verdict
The clearest difference is rating: Sentence Builder Master Pro at 4.6 against (Open Source) Mental Math's 3.0. Sentence Builder Master Pro also leads on review sentiment (33% vs 0%) and ratings volume (46 vs 2). (Open Source) Mental Math's advantage is monetization model (free vs paid). On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Sentence Builder Master Pro holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: Sentence Builder Master Pro has 46 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 33% of Sentence Builder Master Pro's written reviews are positive against 0% of (Open Source) Mental Math's.
Sentence Builder Master Pro ships an update every 3 months, (Open Source) Mental Math every 2 months. The most recent releases landed on September 23, 2026 and September 19, 2026 respectively.
| Parameter | Sentence Builder Master Pro | (Open Source) Mental Math |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (46 ratings) — better | 3.0 (2 ratings) |
| Positive reviews | 33.3% of reviews — better | 0.0% of reviews |
| Number of ratings | 46 — better | 2 |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 16.4 |
| Further details — not scored | ||
| Size | 46 MB | 40 MB |
| Age rating | 4+ | 4+ |
| Developer | Imanol Fernandez Gorostizaga | AHMET EMRE DEDELER |
Customer experience
Sentence Builder Master Pro
(Open Source) Mental Math
In-app purchases
Sentence Builder Master Pro
No in-app purchases
(Open Source) Mental Math
No in-app purchases
Questions
Is Sentence Builder Master Pro free?
Is (Open Source) Mental Math free?
Which has better reviews, Sentence Builder Master Pro or (Open Source) Mental Math?
Do Sentence Builder Master Pro or (Open Source) Mental Math have ads?
Which is updated more often, Sentence Builder Master Pro or (Open Source) Mental Math?
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