How to read the colours
Words with the same colour end in the same sound. A solid underline is an exact rhyme at the end of a line, a dashed one is a rhyme inside a line, and a striped word is a near (slant) rhyme such as loose and lose.
What the score means
The Bars score is our own rule of thumb, from 0 to 100. It rewards lines that rhyme, rhymes inside lines, longer matching sounds, steady line length and fewer repeated end words. It is a guide for editing, not a judgement of your lyrics.
Limits
English only for now. Slang the dictionary does not know, like new words and spellings, is shown with a dotted underline because the sound is guessed. Rap often rhymes by feel across words (orange with door hinge); the checker does not catch every one of those yet.