What ScreenFlow was for
ScreenFlow records the screen, camera and microphone at high quality and drops the result on a timeline with callouts, transitions, captions, templates and ProRes export. It also records iPhone and iPad screens over a cable, which makes it a favorite for app demos. All of that happens on your Mac, under a one-time license.
The Windows split
Windows has no single app that does both halves at ScreenFlow’s level, so the choice depends on which half you used.
If you lived in the timeline, Camtasia is the equivalent: Smart Focus zoom, cursor path editing, callouts, quizzes, captions and templates, on Windows and Mac. The difference is the license, yearly instead of one-time, and a watermark on the cheapest plan.
If you mostly recorded and trimmed, Rapidemo does more with less. The zoom, cursor smoothing, subtitles and camera layout that ScreenFlow users add by hand are added while you record, and you adjust them with simple controls. The feature table above shows where the two differ; the short version is that Rapidemo automates the polish and ScreenFlow gives you a deeper manual editor.
For a quick cut with no budget, Clipchamp is a free download.