Slack offers Free Trial, but Summize does not.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Summize is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Slack begins at $2.67/Month, while pricing details for Summize are unavailable.
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 Summize includes Universal Contract Manager, Contract Advantage, Icertis Contract Management, ContractWorks, Concord, Agiloft Contract Management, Coupa Contract Management, Contract Insight, Dock 365 CMS and ConvergePoint Contract Management.