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WritingFree tier
Mainland China: not confirmed
AI rewrite assistant from AI21 Labs for clearer English sentences, with free and paid use.
AI21 Labs 的英文改写助手，用于让句子更清晰，有免费与付费使用。
Marked “not confirmed” because NavBoth only checked public pages and did not verify access from mainland China.
WritingFree tier
Writing assistant for grammar, tone, and rewrites, aimed mainly at English, with free checks and paid plans.
Mainland China: not confirmed
View listingWritingPaid
Marketing-copy product for campaigns and brand voice. Jasper sells it on paid plans.
Mainland China: not confirmed
View listingWritingFree tier
Perplexity's tool for turning research into shareable article-style pages with citations.
Mainland China: not confirmed
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