Retool

Retool is the leading low-code internal tool builder for engineering teams, enabling developers to build admin dashboards, data management UIs, customer support tools, and internal apps 10–20x faster than building from scratch. Founded in 2017 by David Hsu, Retool is used by over 6,000 companies including DoorDash, Brex, NBC, and Amazon to reduce engineering time spent on internal tooling. Retool's canvas provides 100+ pre-built UI components (tables, forms, charts, maps, rich text editors, file uploaders) that connect directly to SQL databases, REST APIs, GraphQL endpoints, and 100+ cloud services. Components are wired together with JavaScript expressions and event handlers rather than visual wiring — Retool assumes developer literacy while abstracting away HTML/CSS frontend work. Retool Database (Postgres), Retool Workflows (serverless workflow automation), and Retool AI (LLM-powered components for internal AI tools) extend the platform beyond pure UI building into a broader internal engineering platform.