There is a 3rd alternative...
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Why choose ChatWork or Clinked?
In terms of features, both tools offer roles management, chat, file sharing, and group channels. However, Clinked has more advanced features such as custom domain names, online document editing, calendar, task management, notes-taking, and newsfeed. On the other hand, ChatWork has more basic features such as mentions and GIFs, but also offers 1-1 and group video calls. Clinked also has more extensive customer support options including training webinars and a dedicated customer success manager, while ChatWork has a simpler help resources system.