Dǒuyīn hé Dǒuyīn guójìbǎn shì liǎng gè dúlì de yìngyòng.
Douyin and TikTok are two separate apps.
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culture
Chinese users distinguish 抖音 (domestic app) from 抖音国际版 / TikTok (overseas app) — the mainland version is not accessible with a non-Chinese SIM, and TikTok is blocked from Chinese app stores.
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TikTok
Launched by ByteDance in 2017 as the overseas counterpart of 抖音 (Douyin, 2016). The two apps share a similar interface but run on separate servers, with different content libraries and moderation rules.