Free
Free
Flow is open source; flow.org provides documentation and downloads without a commercial subscription.
- Access
- Flow is open source; flow.org provides documentation and downloads without a commercial subscription.
Finding the possibilities
Flow.js
● Identity checkedCode · Vendor site 2026-10-04
Flow is Meta’s static type checker for JavaScript, positioned as a typed dialect with TypeScript-like syntax plus React-first features such as component and renders types. It helps teams catch type errors during development while staying close to JavaScript semantics.
- Category
- Code
- Free access
- Flow is open source; flow.org provides documentation and downloads without a commercial subscription.
- API access
- Not confirmed
Is Flow.js right for you?
A good fit for
JavaScript and React codebases that want gradual typing and stricter component composition checks than untyped JS.
Before you choose
Flow is a developer tool you run locally in CI rather than a hosted service with vendor usage plans.
Static types for JavaScript
Flow adds optional static typing to JavaScript projects, with documentation and tooling aimed at teams migrating from or comparing against TypeScript-heavy workflows.
What it can do
Features & capabilities
Unknown is different from unavailable. Each fact carries its own evidence.
| Capability | Value | Evidence | Checked |
|---|---|---|---|
| Type system | Homepage markets Flow as a typed dialect of JavaScript with familiar TS-style features such as keyof, readonly props, and conditional types. | Facts sourced | 2026-10-04 |
| React support | Site highlights first-class React component and renders syntax for typed composition rules. | Facts sourced | 2026-10-04 |
| Current release | The public site banner references Flow release v0.334.0 on the homepage navigation. | Facts sourced | 2026-10-04 |
Understand the total cost
Flow.js pricing & plans
Alternatives to Flow.js
View all ↗
Aikido SecurityAikido Security is a developer-first application security platform covering dependencies, SAST, secrets, cloud misconfigurations, containers, and AI-assisted autofix across the SDLC. Pricing tiers scale from a free Developer workspace to paid Basic, Pro, and Advanced plans for larger repos and infrastructure coverage.
Explore tool
ClericCleric is an AI SRE agent platform that follows production changes, detects regressions, investigates incidents, and proposes fixes while change context is still fresh. Teams interact in Slack or the web app and pay in credits for completed investigative work.
Explore tool
AskSpot.aiIt targets agencies, small businesses, and creators who want deployable AI tools without long custom development cycles.
Explore toolThe practical questions
Frequently asked questions
What is Flow.js used for?
Flow is Meta’s static type checker for JavaScript, positioned as a typed dialect with TypeScript-like syntax plus React-first features such as component and renders types. It helps teams catch type errors during development while staying close to JavaScript semantics.
Does Flow.js have a free plan?
Flow is open source; flow.org provides documentation and downloads without a commercial subscription.. This record lists ongoing free access; check the plan limits before starting.
How much does Flow.js cost?
No paid monthly price is listed; this record treats the product as free to start. See the plan cards for entitlements, billing commitments and seat minimums.
Can I use Flow.js through an API?
Not confirmed. API access and subscription access may have different terms; consult the linked sources.
What should I check before choosing it?
Flow is a developer tool you run locally in CI rather than a hosted service with vendor usage plans.
Price history
No retained pricing changes yet. A current price alone does not establish a historical trend.
How this profile is supported
Identity and profile
Reviewed vendor source
Read original source ↗Facts apply to the named version and check date. Send a sourced correction if something changed.