Segment

Segment, now part of Twilio, is a customer data platform (CDP) that solves a universal problem: every analytics, marketing, and data tool wants the same customer data, and wiring each one separately is brittle and slow. Segment lets you collect customer events once — from your website, apps, and servers — and then route that clean, standardized data to 700+ destinations (analytics, ads, email, warehouses) without custom engineering for each.

Beyond piping data, Segment unifies identities into persistent customer profiles, offers Reverse ETL to sync warehouse data back into tools, provides governance and data quality controls (Protocols), and enables audience building and personalization. It became the default plumbing layer for modern data stacks because it decouples data collection from the tools that consume it — swap an analytics tool without re-instrumenting your app.

Segment suits product, growth, marketing, and data teams that use many tools and want one reliable source of customer data. Pricing is based on Monthly Tracked Users (MTUs), so cost scales with your unique tracked users, and larger volumes move to custom enterprise pricing.