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Oskar Logo. Black frame on white background. In the frame there is the word Oskar stylized as Braille dot cell and in black writing.

Oskar, mobile braille-keybord

Oskar is a mobile keyboard for your smartphone. Oskar supports the braille alphabet. Oskar is open-source, you can build your own mobile keyboard.

oskar concertina
oskar unikat on top of a smartphone
two hands with oskar study, each finger on a key of oskar

The latest development is called Oskar Concertina.

You can find the sources to Oskar Concertina in the repository.

Oskar Concertina is also described in german.

Braille consists of 8 Braille dots per character. Oskars 8 keys are arranged like a Braille character. Oskar can be operated with one or two hands without a pad.
Hand with eight braille points, two dot per finger
smartphone with symbol for the blind

Blind and visually impaired people rely on non-visual feedback when entering text. Smartphones offer the possibility of virtual keyboards which, however, offer little haptic feedback and are slower than physical keyboards.

Other keyboards, such as electronic Braille keyboards, offer more haptic feedback options, but are not suitable for mobile use because they (unlike smartphones) have to be stored on a fixed surface when operated.

Oskar is a chord keyboard (without fixed pad) for text input on smartphones. Oskar is based on commercially available components and interfaces such as Bluetooth and USB.

Oskar is four times faster than a virtual keyboard for the blind.

Supported by


Johannes Střelka-Petz
Hasnerstraße 93/15-16
1160 Wien

Informationspflicht lt. ECG und Mediengesetz

privacy policy (German)