KingBlade is a color tuning app designed for concert penlights from RUIFAN's KING BLADE series. The app is compatible with X10 Ver.3, 1one, and 1one R models, and it requires a dedicated tuning cable to connect compatible smartphones with the penlight.

With the app's Infinity Color Tuning feature, users can adjust the color balance of the LED's red, green, blue, and white (plus yellow for 1one and 1one R models) to create an infinite number of lighting colors. Users can save their created lighting patterns as a single BLADE and install it on the penlight device as needed from the list of saved BLADEs.

Moreover, users can share their BLADE patterns with others by converting them into QR codes. Overall, KingBlade is a handy tool for concertgoers who want to customize their penlight's lighting colors to match their favorite artist's performance.