+1 to this one =)

Hi! Based on the info we have access to, here's the deal:
- Core functionality is pretty similar. You connect LI accounts and create connection request campaigns. Both tools have an integrated inbox, ability to scrape target audience from events and groups and customized messages.
- The advantage of MA is the wide selection of integrations
- Advantage of Closely is the "invite by email" campaign, email contacts database (coming in around a few weeks) and the fact that it's available for purchase on AppSumo.

Hope this helps :)