なぞなぞかるた is an app developed by 銀鳥産業株式会社 that complements the physical card game. It offers two main features: "かるた読み上げ" and "かるた鑑賞".

The "かるた読み上げ" feature allows users to have the reading cards of the game randomly read aloud by the app. You can customize the time it takes to move to the next card and the number of repetitions for the same card, making it suitable for children of different levels. The user interface is designed to be easy to understand and operate, making it accessible for children to use. This feature is completely free to use.

With the "かるた鑑賞" feature, users can enjoy looking at the picture cards on their smartphone screen. By touching the picture cards, users can play riddle games associated with them. Touching a hiragana character will play the pronunciation of that character. Users can have fun solving riddles while listening to the audio or practice reading the reading cards out loud for hiragana study. This feature is also available for free.

Overall, なぞなぞかるた is a companion app that enhances the experience of playing the physical card game. It provides convenient features for reading the cards aloud and enjoying the cards on a smartphone screen.