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SearchFree
Mainland China: not confirmed
AI2's free academic search engine with paper summaries and citation graphs.
AI2 的免费学术搜索引擎，提供论文摘要与引文图谱。
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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