Retool

Retool is a platform for building internal software, such as admin panels and dashboards. David Hsu co-founded the company in 2017, and it went through the Y Combinator program. It is based in San Francisco.

Developers drag ready made components, such as tables, forms, charts and buttons, onto a canvas and connect them to databases and APIs. They can add JavaScript and SQL where they need custom logic. Retool also offers workflows for scheduled jobs, a mobile app builder and tools for building AI agents that act on company data.

Its customers use Retool to build the tools staff use every day, such as customer support consoles, approval screens and inventory managers. Users range from startups to large enterprises in finance, retail and logistics. Companies can use the cloud version or host Retool on their own servers. David Hsu is chief executive. The company has raised several funding rounds and remains privately held.