Smarter engine: month-name dates (January 5, 2024 → 2024-01-05), clock-time handling, 2-digit years (24-01-15 → 2024-01-15), global separator/case normalize (a_b_c → a-b-c, slug → Title Case), and sequential renumbering for camera dumps (DSC0931 → Beach 1). When it is not sure, it flags — it never silently mangles a file.
Install: open the .dmg, drag Renamr to Applications. First launch (un-notarized): open it, then System Settings ▸ Privacy & Security ▸ Open Anyway (or xattr -dr com.apple.quarantine /Applications/Renamr.app).