The stringster app developed by Sportsnext Application GmbH is designed for badminton players who want to play more effectively with perfectly strung badminton rackets. The app measures the tension level of the strings by their sound, which helps players to check their stringer's performance, monitor the loss of tension over time, and identify the appropriate time for new strings. The precision and touch of a racket can be lost when the strings wear out, which is why it is crucial to replace them on time.

Playing with fresh strings has many advantages, such as higher repulsion power for longer clears and faster smashes, better feel for the ball, more controlled hits, and better shock-damping performance for joint-protection at arm and shoulder. The app is free to use and is available on the Android platform under the Lifestyle category, specifically in the Sports subcategory. The app's interface is user-friendly, and the instructions are easy to follow, even for those who are not tech-savvy.