Click the green flag. Enter a phrase. The scores on the right (from 0 to 100) correspond to the similarity of your phrase to the ones on the left. Feel free to mess with the "blocksize" slider. Best results are achieved with values near 4.
I know I said I won't be so active, but I've got free time today and I just had to do this. Feel free to use if you want. All you need to do is copy the custom block to your project. Oh, and in the Notes and Credits section, add this: Phrase similarity determiner by @Sobsz ( https://scratch.mit.edu/projects/82601356/ ) I'll be very thankful! HOW IT WORKS: It splits up both strings into blocks of a certain size (example: "hello." becomes "hell", "ello" and "llo."). Then it checks how many blocks in the first string exist in the second and it converts that to a percentage.