Email marketing platform Startups

Sailthru is a SaaS platform founded in 2008 that specializes in personalized customer engagement through machine learning, sending 100 billion emails on behalf of customers with one-to-one personalization at scale. Under CEO Neil Lustig (who joined in 2015), the company has scaled from lower ACV customers to enterprise accounts like NBC, Tory Burch, and NASCAR, growing to approximately $40-50M ARR with 400 customers averaging $120k annually. The company maintains less than 15% gross revenue churn, 102-103% net dollar retention, and is now cash flow positive with approximately 200 employees focused on media and e-commerce personalization.

GNU is a bootstrapped marketing automation and email marketing SaaS platform launched in 2008 by Kim Albee, serving small and mid-sized businesses with deep WordPress integration. Currently operating at $85k MRR with ~500 customers paying an average of $170/month, the company has achieved healthy 42% YoY growth while maintaining less than 5% monthly churn through a partnership-driven growth strategy focused on niches like continuing education and entrepreneurship.