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SearchFree tier
Mainland China: not confirmed
Citation analysis tool that shows how papers are cited, with free lookups and paid plans.
展示论文如何被引用的引文分析工具，有免费查询与付费方案。
Marked “not confirmed” because NavBoth only checked public pages and did not verify access from mainland China.
SearchFree tier
Search tool that answers from research papers and shows the academic sources it used.
Mainland China: not confirmed
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Answer engine that searches the web and shows citations beside the reply, with a free tier and a paid Pro plan.
Mainland China: not confirmed
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AI search and chat assistant that answers with citations, with free and Pro plans listed publicly.
Mainland China: not confirmed
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