frontend frameworksQuick Start ↓

Get Started with Is

Type check values with ease.

Getting Started

The Is team maintains comprehensive docs that cover installation, configuration, and common patterns.

Is offers a free tier — sign up to get started without any payment.

Our full tool profile covers Is's strengths, weaknesses, pricing, and how it compares to alternatives.

JavaScript and TypeScript developers who need a reliable way to check types in their applications.

Projects that require robust input validation for functions or APIs.