言う吉くん is an application designed to assist visually impaired individuals in identifying the denominations of paper currency using the built-in camera. By simply pointing the camera at the banknote, the app provides audio and visual feedback regarding its value. The primary function is to offer a supplementary tool for verifying the denominations of paper money, enhancing convenience for those with visual impairments.

The app operates by capturing an image of the banknote with the built-in camera for recognition. There is no need for a shutter button; once the app identifies the denomination, it promptly notifies the user through audio or visual cues.