Feishu

Feishu is ByteDance's workplace platform, combining messaging, documents, calendar, video meetings and workflow approvals in a single tightly integrated product.

What distinguishes it is how completely the parts connect: a document can be edited inside a chat, a meeting produces notes into a shared doc, and approval flows read from the same organizational directory — a level of integration most competitors assemble from separate tools.

It is available internationally under the name Lark, and its document editing in particular is regarded as strong relative to other all-in-one platforms.