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Open Hardware Monitor vs Sidebar Diagnostics: catalog facts
Open Hardware Monitor	Sidebar Diagnostics
Free Free and open source under the Mozilla Public License.	Free Free and open source under the GPL-3.0 licence.
Windows, Linux	Windows
Open source, so the sensor handling can be inspected and reused Readings can sit in the tray or a desktop gadget	Always-visible sidebar instead of a separate window Covers CPU, RAM, GPU, network and drives
Upstream development stopped years ago; Libre Hardware Monitor is the maintained fork Newer chipsets and sensors are frequently unrecognised	Windows only Last code change was in early 2024
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: GPL-3.0
Not stated if an account is needed	No account 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 2, 2026

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