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SearchFree tier
Mainland China: not confirmed
Search tool that answers from research papers and shows the academic sources it used.
从研究论文中找答案的搜索工具，并展示所依据的学术来源。
Marked “not confirmed” because NavBoth only checked public pages and did not verify access from mainland China.
SearchFree tierEditor's pick
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
View listingSearchFree tier
AI search and chat assistant that answers with citations, with free and Pro plans listed publicly.
Mainland China: not confirmed
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Developer-focused answer engine for coding questions, with free use and paid options.
Mainland China: not confirmed
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