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htop vs ProcessSpy: catalog facts
htop	ProcessSpy
Free Free and open source under the GPL.	Free Offered as a direct download from the developer's site.
macOS, Linux, Command line	macOS
Kill, renice and filter processes interactively without typing PIDs Per-core meters and tree view make load easy to read at a glance	Per-process CPU and memory history Recall of processes that have already exited
Terminal only, with no historical graphing Some counters differ per platform outside Linux	macOS only, and requires macOS 14 or later
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.