Portfolio press brief

Four focused learning apps, one calm practice portfolio

Prague, Czech Republic · 29 August 2026. Yellow Bench publishes four free learning apps designed for short, predictable practice without ads, in-app purchases or a required child account.

Free No ads No in-app purchases No required child account

The portfolio

A separate tool for each practice need

Yellow Bench keeps each app focused so a child or accompanying adult can choose a topic, start a short activity and understand the result without navigating a large learning platform. Calm modes remove time pressure where the product supports them.

The portfolio is supplementary practice. It is not a curriculum, assessment system or replacement for teaching. Yellow Bench does not claim better grades, school endorsement, independent learning outcomes or adoption by schools.

Products

Four apps with clear boundaries

English round settings in Kalkulko for Android 1.3.16

Arithmetic

Kalkulko

Short addition, subtraction, multiplication and division rounds. Regular rounds are timed, with a leaderboard and a six-digit code duel. On Android and iOS, users can review the last 50 games and practise saved mistakes without time pressure.

Requires installation: Android 8.0+ or iOS 18.0+. The interface supports ten languages, including English, Czech and Slovak, selected through the phone language.

Download the English Android screen (PNG)

Kalkulko facts checked 12 September 2026: Google Play 1.3.17; App Store 1.7. The iOS release was verified in the Czech, Slovak and US stores.

Czech spelling

Pravopisko

Ninety-six Czech spelling tasks across eight topics, with calm and timed modes, mistake review and result sharing.

Public on the App Store, Google Play and the web.

A number-line exercise in Zlomko on iPhone

Fractions and decimals

Zlomko

Visual fraction and decimal practice covering parts of a whole, number lines, equivalent fractions, comparison and practical situations. The interface supports nine languages.

Public on the App Store, Google Play and the web.

Letter and number tracing

Propisko

Calm tracing of printed letters, numbers and short words in five languages, without grades, timers or competition.

Public on the App Store, Google Play and the web.

Editorial facts

What an editor can verify

Publisher

Yellow Bench s.r.o., Prague, Czech Republic.

Business model

All four products are free, with no ads or in-app purchases. Optional adult support does not unlock features.

Intended use

Short supplementary practice at home or alongside teaching, with no required child account.

Editorial assets

The images on this page are authentic product screens. The full media kit also labels older campaign illustrations separately.

Public destinations

Open each released product directly

These links lead to public storefronts or public web apps. Tracking parameters identify this press brief only.

Kalkulko on the App Store Kalkulko on Google Play Pravopisko on the App Store Pravopisko on Google Play Use Pravopisko on the web Zlomko on the App Store Zlomko on Google Play Use Zlomko on the web Propisko on the App Store Propisko on Google Play Use Propisko on the web

About and contact

Yellow Bench

Yellow Bench s.r.o. develops small educational tools in Prague. Media enquiries: yellowbenchprague@gmail.com.

Open the full media kit App Store developer profile Google Play developer profile