Slack API Startups

Tetra is a knowledge sharing and internal wiki tool built on Slack, founded in 2015 by Andy Cook and Nelson after they left HubSpot. After an initial MVP failed to gain traction, they pivoted to integrate with Slack's newly opened platform and gained 500 signups in 3 weeks, riding the early wave of Slack app ecosystem growth. Today with 535 customers paying an average of $110/month, they've achieved $721k ARR with 104% net revenue retention and 67% YoY growth while maintaining a lean 7-person team.