In April, another gay Chinese dating app, Zank, was also shut down after operating for about four years.
In a message on its Weibo account, which is still available, Zank said it had been accused by the internet regulator of broadcasting pornographic content and so had been closed down.
Many large cities have thriving gay scenes, but gay individuals still face a lot of family pressure to get married and have children.
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Still, gay dating apps are big business, even for Chinese companies.
Last week Beijing Kunlun Tech Co Ltd said it would buy the remaining stake in global gay dating app Grindr that it did not own.
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Apple did not immediately respond to a request for comment.
Internet regulator the Cyberspace Administration of China also did not immediately respond to a faxed request for comment on Monday, which is a national holiday.
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But users began noticing last week that the app, along with its Twitter-like Weibo account and website, was no longer accessible, according to users posting on Weibo under the hashtags #rela and #relahasbeenblocked.