Klataza
Free and without ads
Languages, maths and puzzles. One free app.
Ten minutes a day is enough. Learn Russian, French or English with short lessons you can listen to and repeat out loud. Get help with maths up to your final exams. Then relax with the Sudoku of the day.
No sign-up needed. It runs in your browser and saves your progress on your device.
Three areas, one account
Use one of them or all three. Your streak and your friends come along.
Klataza Languages
Start Russian with the alphabet, or jump into French. Every word is read out, and you speak it back. Reading and listening texts follow once the basics sit.
Klataza Maths
From times tables to derivatives, integrals and full exam tasks. New numbers every time, the working shown step by step, and your mistakes explained.
Klataza Games
Sudoku, Killer Sudoku and Number Runs with a new puzzle every day. Chess, Durak and sea battle against the computer or your friends.
What you get
You hear every word
Words are read out, many of them by native speakers. Say them back and the app listens.
It remembers for you
Words return just before you would forget them. No flashcards to sort.
Play with friends
Send a challenge, see each other’s week, and keep your streak going together.
Ready for class
Printable worksheets with answer keys and QR codes. Pupils join with a link, no accounts.
Free to look up and print
Questions
Which languages can I learn?
Russian (starting with the Cyrillic alphabet) and French. German speakers can also learn English. Next to the languages there is maths practice up to final exams and a set of puzzles and games.
Is Klataza really free?
Yes. Lessons, maths, games and worksheets cost nothing, and there are no ads.
Do I need an account or an app?
No. Klataza runs in the browser on your phone, tablet or computer, and your progress is saved on the device. Add it to your home screen if you want it to feel like an app. An account is only needed to learn on more than one device or to play with friends.
How much should I practise each day?
Five to ten minutes is plenty. Words come back right before you would forget them, so short daily sessions work better than long ones once a week.
Can I use Klataza in class?
Yes. Every lesson has a printable worksheet with a QR code, and pupils can do the lesson on their phones without an account. Teachers can write their own lessons and see how the class did.