Cardea is an open-source WordPress plugin that protects comment forms from automated spam using proof-of-work. It is lightweight, has no dependencies, and is designed for privacy-conscious site owners who want effective spam prevention without extra bloat.
In the Customer support & success space, Cardea takes a focused approach. It focuses on preventing automated spam in WordPress comment forms using proof-of-work without third-party tracking or bloat. It is built as an open-source project for wordPress site owners and bloggers. Cardea is open source under the Open Source license. The product ships for the web.
omikheev builds and maintains Cardea, and the product first shipped in 2026. Development happens publicly on GitHub with 22 commits in the last 90 days. Key capabilities include proof-of-work spam protection, zero dependencies, and lightweight. The interface is available in English and Russian.
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