Slack offers Free Trial, but OnlyThreads does not.
OnlyThreads is designed for Large Enterprises, Medium Business and Small Business.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of Slack begins at $2.67/Month, while pricing details for OnlyThreads are unavailable.
Some top alternatives to OnlyThreads includes Sleeek, Teamline, Slack, SPACE Channel, HuForce, Qualified, Untasked, Linen, Workvivo, Clarity, ChannelSync and IFTTT.
Some top alternatives to Slack includes Microsoft Teams, Glip, Google Chat, ChatWork, Dialog, Office Chat, imBee, Takle, SPACE Channel and Teamwork Chat.