https://github.com/GDBobby/TBFTrainer
Simple enough, it'll tell you the frames between your slash and block, how long you held down block for, and the time between dropping block and pressing slash. It does a current speed (how fast your current BF is) and average speed. Every failure will count against your average speed.
It also has a metronome that you can adjust. You can replace the metronome sound with any .wav file by replacing the metronome.wav in the folder. I included the sound of a slash hitting a wall and the regular slash swing.
It's not perfect, the frames dip below 250 occasionally which leads to a little inaccuracy, but it's pretty close. If you run it as administrator you can use it while gunz is in focus.
The source is included. If you want to compile it yourself you'll need the SFML library.
Note: Minimum TBF speed is around 192 bpm.
Video
https://youtu.be/Tj4FQjIDZHA
