Tablexia is an educational app for children with dyslexia in secondary schools. The results of dyslexia are problems with reading and writing. It is caused by weakened cognitive abilities such as a working memory, attention, spatial orientation or phonological processing. Tablexia aims to support the development of those abilities, which can help to improve the reading and writing skills. Tablexia is an open source game developed by the CZ.NIC association. It is available on Google Play and App Store for free in Czech, Slovak and German language. The app contains 8 games. Each focuses on one of the cognitive abilities. All the games are connected with a detective theme. Young detective learns how to become an expert in chasing the robbers or remembering the right order of the sounds from a crime scene. A part of the app is also an Encyclopedia, where kids can learn about dyslexia and find useful tips how to overcome the troubles by reading and writing.