Slack offers Free Trial, but oak9 does not.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
oak9 is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for oak9 Starts at $2,500 when Billed Monthly.
Some top alternatives to Slack includes Microsoft Teams, Glip, Google Chat, ChatWork, Dialog, Office Chat, imBee, Takle, SPACE Channel and Teamwork Chat.
Some top alternatives to oak9 includes ReclaimAI, ZoomInfo InboxAI, Cycode, Qualified, Secure Code Warrior, Workvivo, AppSec360, akaSAFE, Fallible, IFTTT, Online Check Writer and Drag.