Flow
OPEN SOURCE
Static type checker for JavaScript
About
Flow is a static type checker for JavaScript that helps developers write safer and more maintainable code. It offers features like type inference, type annotations, and advanced tooling for modern web development.
Pricing
Pricing Type
Open Source
Free tier available
Billing
Billed monthly
Last checked: February 23, 2026
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Key Facts
Categories
Platforms
Web
Company
Flow
Founded
Founded in 2014
Country
Global
Language
English