Comparison

Grammatik Duell vs Number Decomposition

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Grammatik Duell

Practice German grammar and spelling through an engaging matching game. Choose from various grammatical areas and difficulty levels to improve your language skills. Compete against yourself or others in this fun, educational duel.

Highlights
  • German grammar and spelling practice
  • Matching game mechanics
  • Variable card pairs and player numbers
  • Adjustable difficulty levels
  • Read-aloud function
  • Focuses on grammatical areas
  • Reward system for motivation
Features
Read full description

+++ Dyslexia Quality Award Winner 2015 +++ This entertaining and educational matching game app helps you practice your German grammar and spelling in a fun way. Whether you need to brush up on parts of speech, conjugation or declination, tenses and types of sentences - no matter what you need, the various grammatical areas can be combined with each other and practiced. With one click, the appropriate themes are chosen, easy as pie, and you can start right away. Matching pairs must be found, either by purely assigning terms to the proper categories (intelligent = Adjektiv | Ich werde spielen = Futur 1) or as a concentration-enhancing matching game. THE GRAMMATIK DUELL HELPS YOU PRACTICE YOUR KNOWLEDGE IN A FUN WAY Both the number of card pairs and the number of players are, of course, variable. Depending on your wishes, the cards can be read aloud, and the length of time in which the cards are revealed is adjustable. The difficulty level of the app increases with the number of card pairs and the chosen area of grammar. It is aimed at all students who are not yet entirely comfortable in their use of grammatical terms or who want to practice for their next grammar lesson in a fun way. You can also work on improving your spelling. STRONG MOTIVATION TO LEARN GRAMMAR On your own in a race against time or against a challenging opponent - who will use the fewest number of moves to find the matching pairs? Who will collect the most stars and end up the winner in this grammatical duel? The beautiful visual presentation of the playing cards, the acoustic sounds of success, the pleasing voice that reads aloud, the game variations, the pedagogically sophisticated content and the strict limitations of only relevant content make this app a truly worthwhile learning aid. The Grammar Challenge makes learning grammar fun! PEDAGOGICAL BENEFITS OF THE APP: • Self-explanatory • Concentrates on the content without distractions • Motivates with a reward system • Practice mode • Boosts concentration skills • Selectable levels of difficulty • Selectable number of card pairs • Selectable read-aloud function • Selectable areas of grammar • “Assignable” game variations • Beautiful, relevant graphics • No in-app purchases • No online connection necessary • Learning psychology tested and approved TECHNICAL AND PEDAGOGICAL KNOW-HOW COME TOGETHER IN THE GRAMMATIK DUELL The idea for this app with regard to its content was created by licensed pedagogue Uta Reimann-Höhn (www.lernfoerderung.de), who has published numerous books as an expert on education and upbringing, and who has been the editor-in-chief of “Lernen und fördern mit Spaß!” (“Learn and Grow with Fun!”) since 2006. The idea was implemented by Jan Essig (www.janessig.com), a designer who has made a name for himself with his high-quality educational apps “Adventure Playground” and “Preschoolers ABC Playground” and has won numerous awards.

About

Number Decomposition

This educational app teaches children foundational math skills by focusing on number bonds up to 10, avoiding counting to build a strong understanding of arithmetic. It uses visual aids and a structured approach for quick, accurate recall of addition and subtraction facts.

Highlights
  • Number bonds up to 10
  • Drag and drop interface
  • Visual quantity images
  • Spaced repetition learning
  • Child-friendly avatars
  • Offline functionality
Features
Read full description

LEARN MATH – WITHOUT COUNTING Many children learn arithmetic by counting. That is tedious and often the start of later difficulties with math. This app begins exactly where true understanding develops after quantity–number correspondence: with the automation of number bonds up to 10. Children learn how numbers are structured and can solve addition and subtraction tasks safely, quickly, and from memory. No counting, no frustration, with visible success. HOW IT WORKS • Example: 8 = ? and 3 • One part is given, the other is added via drag & drop • Correct? → reward and progress • Wrong? → gentle feedback and repeat • Only fast, correct answers (under 5 seconds) count as “known by heart” MADE FOR CHILDREN – EVEN WITHOUT READING • Intuitive operation with number tiles and structured quantity images (dice, fingers, dots, and more) • Four child-friendly animal avatars: panda, dolphin, cat, dog • Each correct task colors the avatar more • Learning progress is always visible and motivating FOCUSED LEARNING INSTEAD OF A GAME APP • Reduced sounds and calm, clear visuals • No distracting effects, no flashy colors • Clear didactic structure: not a game, but a real teaching and learning app PEDAGOGICALLY SOUND – RESEARCH-BASED • Leitner learning system with spaced repetition (boxes 1–4) • Didactic reduction: only meaningful decompositions, no swapped pairs, no zero • Structured quantity images strengthen number sense and understanding • Error-oriented learning: incorrect tasks are deliberately repeated • Progress per avatar is transparent – also for parents and teachers SAFE AND AD-FREE • No ads • No in-app purchases • Works offline – ideal for on the go • One-time purchase, permanent use DOWNLOAD NOW – MAKE MATH SIMPLE With this app, your child becomes a master of number bonds: playful, visually structured, and sustainable. Ideal for preschool, first grade, or home practice – without distractions and with full focus on what matters.

Screenshots

Grammatik Duell4 screens
Number Decomposition4 screens

Verdict

The call

The clearest difference is review sentiment: Number Decomposition at 100% against Grammatik Duell's 25%. Grammatik Duell's advantage is update cadence (every 2 months vs every 5 months) and price ($0.99 vs $3.99). On ads, in-app purchases, monetization model and device support 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

CostPrice · In-app purchases · Ads · Monetization

Grammatik Duell costs $0.99 and Number Decomposition $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Grammatik Duell ships an update every 2 months, Number Decomposition every 5 months. The most recent releases landed on September 7, 2026 and September 15, 2026 respectively.

Scorecard4 real differences · 4 level
Grammatik Duell versus Number Decomposition: the parameters behind the verdict, then further details
ParameterGrammatik DuellNumber Decomposition
Price$0.99 — better$3.99
Positive reviews25.0% of reviews100.0% of reviews — better
Update frequencyEvery 2 months — betterEvery 5 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.0
Further details — not scored
Size15 MB78 MB
Age rating4+4+
DeveloperJan EssigLernwunder

Customer experience

Grammatik Duell

Written reviews4 reviews
Positive25.0%
Neutral25.0%
Negative50.0%

Number Decomposition

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Grammatik Duell

No in-app purchases

None

Number Decomposition

No in-app purchases

Questions

Is Grammatik Duell free?
Grammatik Duell costs $0.99, with no in-app purchases.
Is Number Decomposition free?
Number Decomposition costs $3.99, with no in-app purchases.
Do Grammatik Duell or Number Decomposition have ads?
Neither Grammatik Duell nor Number Decomposition shows ads.
Which is updated more often, Grammatik Duell or Number Decomposition?
Grammatik Duell ships an update every 2 months, and Number Decomposition every 5 months. Most recently, Grammatik Duell was updated on September 7, 2026 and Number Decomposition on September 15, 2026.

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