Small by design
The install from the Microsoft Store is 4.0 MB — no bundled runtime, no separate updater, nothing else to wait on before it opens.
There is no window to open, resize or close — the always-on-top widget is the whole interface, sitting wherever you left it.
Recordings encode with hardware-accelerated H.264, so the work is handed to the graphics hardware already in the machine rather than ground out entirely in software.
Global shortcuts trigger a capture without alt-tabbing to find the widget first, and they're rebindable to whatever keys suit you.

A 4.0 MB install puts every capture mode behind one floating widget — nothing else to open first.
The download and the finished install are the same 4.0 MB — nothing unpacks into something larger afterward.
It stays always on top, wherever you put it, with no separate application window behind it.
Set a global shortcut to whatever keys you prefer, so triggering a capture never depends on finding the widget on screen first.
Press the shortcut and capture starts from wherever you already are, with encoding handled by the graphics hardware.
Supported on
Windows 10 (1809+) · Windows 11 · x64 · ARM64
4.0 MB from the Microsoft Store — the entire install, not a starting number that grows after first launch.
No — nothing extra to install; the 4.0 MB download is everything the app needs to run.
Yes — it runs on Windows 10 from the 1809 update onward and on Windows 11, natively on both x64 and ARM64 hardware.
Yes — recording uses hardware-accelerated H.264 encoding rather than encoding done entirely in software.
Just the floating widget, and it excludes itself from every capture and recording it makes, so it never shows up in the result.
$12.49, once.
Buy on Microsoft Store — $12.49