GrexIt vs Gmelius: What are the differences?

Developers describe GrexIt as "Use shared Gmail Labels to assign emails as tasks". GrexIt turns your email into a powerful collaboration tool. Shared Labels automatically share follow-up emails and sent emails once they are added to the Gmail thread. Shared Labels work from all email clients like Outlook, Thunderbird, iOS, Android etc. - your shared labels would simply show up as folders on these email clients. On the other hand, Gmelius is detailed as "The shared inbox made for your team". Easily manage group emails like support@, sales@ or any other team email right from Gmail or Slack. Shared inboxes replace your help desk software and simplify email management as a team.

GrexIt and Gmelius can be categorized as "Team Inbox" tools.