A large share of resumes are rejected by software before any person opens them, usually for missing the words the posting used. The fix is to rewrite for each posting, which is real work, which is why almost nobody does it for every application.
Tailor does that rewrite. It reads the posting, reads your master resume, and produces a version that speaks the posting's language while staying true to what you actually did. You get an ATS score for the result before you send it, and a cover letter written from the same material.
Your master resume is untouched. Each tailored version is its own document, saved so you can re-open exactly what you sent when the call comes.

Rewritten for the posting
Reordered, reworded, and matched to the language the employer used.
Scored before you send
See the ATS score of the tailored version, not just the master.
Cover letter included
Written from the same material, in the same generation, for the same credit.
Your first tailored resume is free, no card needed. After that it is one credit per generation, and that single credit covers both the tailored resume and the cover letter. If generation fails or times out, you get the credit back (and if it was your free one, you keep the free one).
Full documentation, including the limits