Fluency is an iPhone application developed by Chris Lang that measures syllables per minute and the percentage of syllables stuttered in a simple and easy-to-use interface. This program is ideal for speech pathologists or parents of children with disfluency.

The app has two modes: Basic and Advanced. In Basic mode, users can count syllables and stutters. In Advanced mode, users have specific disfluency counting options such as word, sound, and phrase repetitions, block, and prolongation. The application is designed to work in both portrait and landscape mode, allowing users to choose the best option for their needs.

Fluency is a great tool for anyone looking to measure fluency quickly and accurately. With its user-friendly interface and advanced options, it is an essential tool for speech pathologists and parents alike.