Anki FSRS Visualizer https://open-spaced-repetition.github.io/anki_fsrs_visualizer/ You can use query params to set initial state: https://open-spaced-repetition.github.io/anki_fsrs_visualizer/?w=0.4072,1.1829,3.1262,15.4722,7.2102,0.5316,1.0651,0.0234,1.6160,0.1544,1.0824,1.9813,0.0953,0.2975,2.2042,0.2407,2.9466,0.5034,0.6567&m=0.80