Optional adult support

Keep the learning apps free

Kalkulko, Pravopisko, Zlomko and Propisko are free, without ads or locked features. An optional contribution helps Yellow Bench maintain, test and responsibly distribute the apps.

Choose an amount

This is for adults only. A contribution unlocks nothing, creates no score advantage and is not a subscription. This page is not presented as a registered public collection.

CZK 25 A small thank-you for one useful practice round. Opens a secure checkout. CZK 49 Helps with hosting, testing and maintenance. Opens a secure checkout. CZK 99 Supports another round of product testing and distribution. Opens a secure checkout.

Secure checkout is provided by Stripe.

Stripe shows the final amount and currency before payment. A supported checkout may present the amount in your local currency.

What the contribution means

It is optional support from an adult to Yellow Bench s.r.o.
It is not a purchase of app features and does not create a subscription.
Stripe processes payment details; the Yellow Bench website does not receive a card number.
Questions or an accidental payment can be reported to yellowbenchprague@gmail.com.

See the bilingual privacy information and terms before contributing.