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1+1

by creasoft.de

  • Education
  • Paid
View on the App Store
Rating
0.0
0 ratings · Albania storefront
Last update
Oct 7, 2026
Version 1.1.3
Size
44 MB
Category
Education
Tracked since
Oct 10, 2026

Estimated revenue

A model estimate with a likely range, not a reported figure.

No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.

How this estimate is made

Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.

Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.

Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.

Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.

Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.

Full method

Screenshots

As shown on the App Store listing.

About this app

Text from the App Store listing.

1+1 helps to teach children how to add numbers from 1 to 10. The app doesn't use any words, so it can be used by children in any language. The app has been tested by teachers — you will find the references inside the app, under "references".

The app has eight levels, from BEGINNER to INSANE. Each level has nine games, its own tasks and its own trophy — 72 games and eight trophies in all. The levels up to HARD already cover all 45 addition tasks from 1 to 10; CHAMPION and INSANE are an extra challenge on top.

Our apps are based on a modification of the Leitner system:
http://en.wikipedia.org/wiki/Flashcard
This means that a task comes back until the child answers it correctly. The app also remembers every task the child has ever got wrong and brings it back later; in the two highest levels, part of every game is drawn from that list. This is how the answers stay in the child's memory, so real learning happens.

If the child answers all the tasks of a game correctly, the game is finished, and the next game opens only when the score is high enough. Every game can earn up to three stars. To earn the third star, the child has to play the game again, this time without the help of the animals.

  • Eight levels with nine games each, and a trophy for every level
  • Every player has their own name, their own scores and their own settings
  • Two settings per child: how many different tasks one game holds, and how often a task comes back
  • The scores can be reset, so that a child can repeat the lessons later, or another child can do the exercises
  • No advertising from third parties
  • No account and no registration
  • Links out of the app only behind a parental gate

Please note that our apps are real educational apps, made, among others, for the classroom and for homework. In our apps the education is more important than fun. Our apps are more like doing homework than playing a game, so finishing them can be some work for a child. It might be helpful if the parents or teachers support the child's motivation. The reward for the work is that the child will master all addition tasks up to 10 without any problems.

We would very much appreciate any feedback from you: [email protected]

Recommended for ages 6 - 8

What’s new

Release notes for the latest version, as written by the developer.

v1.1.3
  • The cat and the elephant now dance on the trophy page, too.
  • A big finale in game 9: the trophy appears with sparklers and fireworks.
  • Updated for current iOS versions.
  • Small fixes and improvements.

Rank history

Daily position in the Bahamas charts. #1 is at the top.

Best rank
#2
Current rank
#2
Days charting
7 of 7

On the charts today

Small & simple score

How realistic it is for a small team to build something like this.

91/100

Not flagged as small & simple

  • Developer size70% · 25

    Developer: 2 apps on the charts

  • Audience size– · 20

    No data, weight redistributed

  • App size100% · 10

    Size: 44 MB

  • Price model100% · 15

    Price model: paid

  • Demand proof100% · 30

    Best rank #2, 31 countries

An indicator, not a fact. We can't see team size. Calculated Oct 25, 2026 · method i2

How the score works

Version history

  • 1.1.3LatestReleased Oct 7, 2026