It's well known if you want to play fast on the guitar, before you must be able to play slow clear and comfortably. Then you can try to play a bit faster. Sometimes it's also useful to play outside of your comfort zone.
You begin by setting the initial speed and the duration of the exercise. Then you have to set a target speed, a little faster than the initial speed. That's all. Press the button START and Fachords Smart Metronome, during the exercise, will gradually increase the bpm speed, bringing your comfort zone to an higher level.

Free, online, easy to use,
Odd rhythms such as 5/4, 7/8, 9/8, etc
Automatic speed bpm increase. Set initial speed, target speed and exercise duration, Fachords Smart Metronome will increase the speed gradually.