Comparison

Rechenkönig vs Understanding Math

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

Head to head
About

Rechenkönig

Features
Read full description

Rechenkönig ist eine unterhaltsame Anwendung, die Schulanfängern Spass am Rechnen vermittelt. In einfachen Aufgaben werden Additionen im Zahlenraum 1 - 10 geübt. Für jede richtig gelöste Aufgabe wird ein Stück von einem Schloss gebaut, so dass zu Schluss ein Prinzessinnenschloss mit 20 Türmen entsteht. Dadurch werden die Kinder motiviert, auch die nächste Aufgabe zu lösen. Für eine falsch gegebene Antwort verschwindet der zuletzt gebaute Turm wieder. Nach drei Fehlern ist ein Spiel zu Ende. Der Schwierigkeitsgrad wird mit jeder Runde erhöht, so dass das Spiel auch noch nach vielen Runden nicht an Reiz verliert. In den späteren Runden kommen weitere Aufgabentypen dazu: zunächst Subtraktion und später Aufgaben vom Typ 3 + ? = 5 (eingetragen werden muss dann 2). Noch später werden verkettete Aufgaben gestellt (2 + 4 -1 = ?). Wer das Schloss vollständig in der 20. Runde gebaut hat, bekommt Zufallsaufgaben, die dann auch Multiplikation und Division enthalten. So können die Kinder auch später testen, wie weit sie mit maximal drei Fehlern kommen. Das Spiel wurde sehr erfolgreich an den eigenen Kindern getestet, die sich gar nicht mehr vom iPad losreissen konnten.

About

Understanding Math

This app offers interactive games and exercises to help children understand and practice addition and subtraction up to 100. It features multiple user profiles, progress tracking, and a competitive duel mode for engaging learning.

Highlights
  • Unlimited user profiles
  • Track child's achievements
  • Addition and subtraction up to 100
  • Four different game settings
  • Interactive learning methods
  • Duel mode for competition
Features
Read full description

Children´s Technology Review - EDITORS CHOICE FOR EXCELLENCE IN DESIGN: "Teachers take note of this excellent set of classroom friendly math exercises that is coming April 2. Features include unlimited user profiles (children must enter their name) and the ability to track each child's achievements by both quality (accuracy) and quantity, and the ability to see how to add and subtract quantities of up to 100 in 4 different setting." "Innovative, engaging, and fun; finally an app that teaches kids HOW to do math." TeachersWithApps.com "This is another excellent math app by appp media. At Fun Educational Apps, we review many apps devoted to teaching math; Understanding Math- Addition and Subtraction ranks as one of the best of the best. That's why it has earned our latest TOP PICK." FunEducationalApps.com OnSarahsiPad.com: "Understanding Maths - Addition and Subtraction is an ideal app for both home and school. It will be particularly valuable in the lower grades of school and for those children who are moving from concrete to symbolic representations of addition and subtraction. Older children struggling with these concepts will also enjoy using this app as it has an age-appropriate interface" Understanding Math - Addition and Subtraction is the second app in a series of educational apps based on J. Bruner's Learning Theory “Three Modes of Representation”. Understand and practise addition and subtraction in 4 games and show your skills in the Duel! Compete against your peers or even parents by setting different levels of difficulty. Addition - Tap with your fingers Solve the problem by touching the display. Example: 3 + 5 Tap with 3 fingers, then with 5. After solving the problem, you can pop the objects by touching them. Please turn the "Multitasking Gestures" on your iPad to OFF in "General Settings", as these will close the app! Common Core Standards: Understand addition Addition Drag down the correct amount of tens and ones. Example 37+8= Drag down 3 tens and 7 ones of one colour and 8 ones of the other colour. See and understand place value: ten "ones" make one "ten". Common Core Standards: Understand place value Understand addition Subtraction Drag down the correct amount of tens and ones. See and understand that ten is a bundle of ten ones See and understand the place value when taking one away from 10 Common Core Standards: Understand place value Understand subtraction Training Solve the problem by writing the solution onto the screen. Help is provided by the iconic representation of the numbers. Common Core Standards: Fluently add and subtract within 20 or 100 using mental strategies Duel Two players compete against each other. Each player can choose his level of difficulty. Tap the sun to start. The first to enter the correct solution will earn a star. Earning 5 stars wins the game. Level 1: ->20, + Level 2: ->20, +, - Level 3: ->100, + Level 4: ->100, +, - Common Core Standards: Fluently add and subtract within 20 or 100 using mental strategies Toolbox Enter your own addition or subtraction equation. Explore the place value. Privacy Policy You don’t have to worry about your child playing independently with appp media apps because we take your child’s privacy and online safety very seriously. Our apps include: • no links to websites outside the app without a gate • no ads • no data collection or tracking • no social media sharing • no in-app purchases For detailed information on our privacy policy, visit www.apppmedia.com ––––––––––––––––––––––––––––––––––––––––––––––––––––– KNOW WHAT'S INSIDE As a MOMs with Apps member, we follow the "Know what's inside" best practices for kids’ apps ––––––––––––––––––––––––––––––––––––––––––––––––––––– At appp media we value your feedback so please email your comments or questions to support@apppmedia.com

Screenshots

Rechenkönig2 screens
Understanding Math4 screens

Verdict

The call

The clearest difference is update cadence: Understanding Math at every 11 months against Rechenkönig's every 39 months. Understanding Math also leads on iOS requirement (8.0 vs 12.0). Rechenkönig's advantage is price ($1.99 vs $3.99). On ads, in-app purchases 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

Rechenkönig costs $1.99 and Understanding Math $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Rechenkönig ships an update every 39 months, Understanding Math every 11 months. Both last shipped on November 1, 2026.

Scorecard3 real differences · 5 level
Rechenkönig versus Understanding Math: the parameters behind the verdict, then further details
ParameterRechenkönigUnderstanding Math
Price$1.99 — better$3.99
Positive reviews—78.6% of reviews
Update frequencyEvery 39 monthsEvery 11 months — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.08.0 — better
Further details — not scored
Size10 MB37 MB
Age rating4+4+
DeveloperDr. Peter Schmidtappp media UG

In-app purchases

None

Rechenkönig

No in-app purchases

None

Understanding Math

No in-app purchases

Questions

Is Rechenkönig free?
Rechenkönig costs $1.99, with no in-app purchases.
Is Understanding Math free?
Understanding Math costs $3.99, with no in-app purchases.
Do Rechenkönig or Understanding Math have ads?
Neither Rechenkönig nor Understanding Math shows ads.
Which is updated more often, Rechenkönig or Understanding Math?
Rechenkönig ships an update every 39 months, and Understanding Math every 11 months. Most recently, Rechenkönig was updated on November 1, 2026 and Understanding Math on November 1, 2026.

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