Klaviyo - Klaviyo helps brands own the customer experience, grow higher-value relationships, and deliver more personalized marketing experiences across email, mobile, and web.

Spike.sh - Spike is an incident management platform that alerts via slack, phone and email and automatic escalations to help teams fix infrastructure problems.

Criteo - Build, scale, and activate first-party audiences with The Commerce Media Platform.

Clerk - Clerk.io, the artificial intelligence for e-commerce that knows your customers interests.

Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.

Sendblue - Programmatically send iMessage and SMS