Yellow BenchEducational apps

For parents and caregivers

Short practice with a clear finish

Choose arithmetic, fractions, Czech spelling or first writing. Every app is free, has no ads or in-app purchases, and works without a required child account.

Choose an app Teacher guide
No adsNo advertising interruptions or advertising identifiers.
No purchasesNo locked exercises or in-app purchases.
No child accountStart practicing without creating a profile.

The actual products

See the activity before choosing it

These are current screens from the four apps, not illustrative mockups.

A timed arithmetic problem in Kalkulko
KalkulkoTimed arithmetic with a clear result.
Pravopisko topic selection for Czech spelling
PravopiskoCzech-language spelling practice.
Zlomko category and mode selection
ZlomkoVisual fractions in calm or timed mode.
Propisko printed-letter tracing home screen
PropiskoCalm tracing without grades or a timer.

One portfolio, four purposes

Choose the practice that fits today

Kalkulko: arithmetic with optional comparison

Choose addition, subtraction, multiplication or division, the number range and the length of the round. Results include accuracy and time; local and online leaderboards and a room-code duel are optional.

Ordinary Kalkulko rounds are timed. The last 50 completed games stay on the device, with recorded answers and correct solutions. After a completed round, children can practise its saved mistakes without a timer or leaderboard.

App Store Google Play See the saved-mistake screenshot guide (1 min 54 sec)

Pravopisko: Czech spelling

Eight Czech spelling topics in short Learn or Challenge rounds. This app teaches Czech spelling; it is not a general spelling app for other languages.

App Store Google Play Use on the web

Zlomko: visual fractions without required timing

Practice parts of a whole, number lines, equivalent fractions, comparisons and practical situations in nine interface languages. Calm mode does not measure time.

App Store Google Play Use on the web Print a fractions worksheet

Propisko: calm first writing

Trace printed letters, numbers and short words with a finger or stylus in English, Czech, Spanish, French or Portuguese. There is no timer, score or leaderboard.

Propisko on the App Store Propisko on Google Play Open the web app

Questions parents often ask

Do children need an account?

No. The four apps can be used without a required child account.

Are the apps free and ad-free?

Yes. There are no ads, in-app purchases or locked practice sets.

Does every activity use a timer?

No. Ordinary Kalkulko rounds are timed, but saved mistakes from a completed round can be practised without a timer. Zlomko offers a calm mode, and Propisko has no timer or score.

Are these complete courses?

No. They are supplemental practice tools, not a replacement for teaching, school materials or professional assessment.