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CLion vs Eclipse IDE for C/C++ Developers: catalog facts
CLion	Eclipse IDE for C/C++ Developers
Freemium Free for non-commercial use. Commercial use requires a paid subscription.	Free Free and open source under the Eclipse Public License.
Windows, macOS, Linux	Windows
Understands CMake and compilation databases rather than guessing at includes Remote and embedded debugging built in	C and C++ tooling bundled in one package Open source with long-running foundation governance
Commercial use requires a paid subscription Indexing large C++ codebases is slow	Heavier than a plain code editor The Eclipse workspace model takes some getting used to
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: EPL-1.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it 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.