Comparison

Lazuli 4+ vs Rasend Rechnen

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

Head to head
About

Lazuli 4+

This educational app offers engaging 3D garden adventures for children aged 4 and up. It features 15 adaptive learning games with multiple difficulty levels to strengthen cognitive skills, including math, memory, and concentration. Parents can also enjoy creative free play modes and track learning progress.

Highlights
  • Adaptive learning games
  • Cognitive skill development
  • Math and memory training
  • Creative free play modes
  • Parental progress reporting
  • Child-friendly design
Read full description

Lazuli 4+ is the first of four apps in the Lazuli learning system, designed for children ages 4 and up. Many three-year-olds also enjoy it—with a little help from parents or siblings. Lazuli’s 3D garden is brimming with adventures, and all that play can work up an appetite! Solve the puzzles to help Lazuli get his bone. The game adapts to each player’s needs and abilities. Each of the 15 learning games offers three difficulty levels and multiple variations, resulting in over 250 challenges. This way, children—or the whole family—can test and strengthen their cognitive skills. The basic skills practiced here are part of the educational mission of all German kindergartens. Building on these standards and current scientific research, a team of educators, psychologists, and artists—all parents themselves—developed this unconventional learning concept. Awards ======= Children’s Media Award “THE WHITE ELEPHANT” 2018 – “Best App” German Children’s Software Award “Tommi” 2018 – “Best App” German Children’s Software Award “Tommi” 2018 – “Special Award for Kindergarten and Preschool” Educational Media Award 2018 – “Best App” Comenius-EduMedia Seal 2018 Nominated for the “Animated Games Award” 2019 The FilmFernsehFonds Bayern supports Lazuli as a valuable educational introduction to the digital world. Learning for Life – In Lazuli 4+, children learn: ================================== Basic math skills (detailed information at www.Lazuli-App.com) How to train their visual and auditory memory How to distinguish colors, shapes, and quantities How to read and match numbers How to stay focused and concentrate Free Play – Make the Garden Come Alive ============================== Perform cool tricks with Lazuli Collect butterflies, share balloons, and hatch chicks Enjoy five new songs in each app Get creative: compose your own melodies or play the displayed tunes in three different pitches And It’s All So Beautiful ================= Elaborate design inspired by various art styles and creative techniques Custom-composed music for a relaxing play environment Over 300 animations bring the little blue Lazuli to life as a new kind of interactive main character Important for Parents and EducatorsImportant for Parents and Educators ===================================================== Option to limit playtime Individual reporting for personal learning progress 100% child-friendly: No ads No in-app purchases / no hidden costs No collection of personal data No social media connections No location tracking No push notifications No child-accessible links to external sites (all external links are in a parent-only, protected area) As parents and educators ourselves, the security of children’s data is our top priority. Learn more on our website: www.Lazuli-App.com. About Lazuli: Lazuli is a learning system featuring the following apps: Lazuli 4+ Lazuli 5+ Lazuli 6+ Lazuli 7+ Lazuli Times Tables Lazuli Buttons If you enjoy our apps, we’d be delighted if you recommend them and leave a review here in the App Store. This helps us continue our work—thank you so much! You can find more information and background on our website. For any questions, feedback, or technical suggestions, feel free to email us at info@Lazuli-App.com. We test our apps very thoroughly. However, should you encounter any issues or errors, please let us know at support@Lazuli-App.com. Have fun with Lazuli!

About

Rasend Rechnen

Features
Read full description

Kopfrechnen kann Spaß machen! Egal ob am Telefon, Tablet oder in der Klasse am Board, mit dieser App könnt ihr spielend leicht rechnen üben. Sucht euch einen Zahlenbereich aus und übt einfach los, oder aber tippt auf die Fahne und versucht in der von euch gewünschten Zeit den Highscore zu knacken. Noch mehr Spaß macht hier der Zwei-Spieler-Modus. Fordert eure Freunde heraus und rechnet um die Wette!

Screenshots

Lazuli 4+4 screens
Rasend Rechnen3 screens

Verdict

The call

The clearest difference is price: Rasend Rechnen at $0.99 against Lazuli 4+'s $3.99. On update cadence, 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

Lazuli 4+ costs $3.99 and Rasend Rechnen $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Lazuli 4+ ships an update every 5 months, Rasend Rechnen every 3 months. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

Scorecard1 real difference · 7 level
Lazuli 4+ versus Rasend Rechnen: the parameters behind the verdict, then further details
ParameterLazuli 4+Rasend Rechnen
Price$3.99$0.99 — better
Positive reviews94.1% of reviews—
Update frequencyEvery 5 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.013.0
Further details — not scored
Size670 MB44 MB
Age rating4+4+
Developerfunline Media GmbHMichael Repenning

In-app purchases

None

Lazuli 4+

No in-app purchases

None

Rasend Rechnen

No in-app purchases

Questions

Is Lazuli 4+ free?
Lazuli 4+ costs $3.99, with no in-app purchases.
Is Rasend Rechnen free?
Rasend Rechnen costs $0.99, with no in-app purchases.
Do Lazuli 4+ or Rasend Rechnen have ads?
Neither Lazuli 4+ nor Rasend Rechnen shows ads.
Which is updated more often, Lazuli 4+ or Rasend Rechnen?
Lazuli 4+ ships an update every 5 months, and Rasend Rechnen every 3 months. Most recently, Lazuli 4+ was updated on October 24, 2026 and Rasend Rechnen on October 30, 2026.

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