What is Flow and who created it?

Flow is a static type checker for JavaScript, created and maintained by Meta (formerly Facebook). It is written in OCaml and released under the MIT License.

Which programming language is Flow written in?

Flow is implemented in **OCaml**, a functional programming language that extends Caml.

What is the latest stable version of Flow?

The most recent stable release is **0.295.0**, published on **2025‑12‑18**.

Where can I find Flow’s source code?

The source code is available on GitHub at .

How active is Flow’s development?

Flow has a continuous release cadence, with new versions released roughly every month from 2020 through 2025, indicating active maintenance.

Which license governs Flow?

Flow is distributed under the **MIT License**, allowing free use, modification, and distribution.

Does Flow have a social media presence?

Yes, Flow maintains a Twitter account @flowtype, which had 11,955 followers in April 2022 and 11,641 followers in February 2023.

What is Flow’s relationship with Meta?

Meta is the developer and maintainer of Flow, and the tool is part of Meta’s broader ecosystem of open‑source projects.

Yes, Flow’s source code is publicly available on GitHub and licensed under the MIT License.

What platforms can Flow run on?

Flow is a command‑line tool that runs on any platform where OCaml can be compiled, typically Linux, macOS, and Windows.

flow

static type checker for javascript

SoftwareApplication software Q111269149

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flow

Summary

flow is a software^[1].

Key Facts

flow's instance of is recorded as software^[2].
flow's developer is recorded as Meta^[3].
flow's copyright license is recorded as MIT License^[4].
flow's programmed in is recorded as Q2005^[5].
flow's programmed in is recorded as OCaml^[6].
flow's software version identifier is recorded as 0.117.0^[7].
flow's software version identifier is recorded as 0.117.1^[8].
flow's software version identifier is recorded as 0.118.0^[9].
flow's software version identifier is recorded as 0.119.0^[10].
flow's software version identifier is recorded as 0.119.1^[11].
flow's software version identifier is recorded as 0.120.0^[12].
flow's software version identifier is recorded as 0.120.1^[13].
flow's software version identifier is recorded as 0.121.0^[14].
flow's software version identifier is recorded as 0.122.0^[15].
flow's software version identifier is recorded as 0.123.0^[16].
flow's software version identifier is recorded as 0.124.0^[17].
flow's software version identifier is recorded as 0.125.0^[18].
flow's software version identifier is recorded as 0.125.1^[19].
flow's software version identifier is recorded as 0.126.0^[20].
flow's software version identifier is recorded as 0.126.1^[21].
flow's software version identifier is recorded as 0.127.0^[22].
flow's software version identifier is recorded as 0.128.0^[23].
flow's software version identifier is recorded as 0.129.0^[24].
flow's software version identifier is recorded as 0.130.0^[25].
flow's software version identifier is recorded as 0.131.0^[26].

⭐ Popularity Graph

4/100 established

📊 Google Search Volume

301,000/mo Navigational

Quick Facts

Instance of software

Official website flow.org

Has use type checking

Properties

Developer Meta

Programmed in JavaScript, OCaml

Social media followers +11955, +11641

Software version identifier 0.117.0, 0.117.1, 0.118.0, 0.119.0, 0.119.1, 0.120.0, 0.120.1, 0.121.0, 0.122.0, 0.123.0, 0.124.0, 0.125.0, 0.125.1, 0.126.0, 0.126.1, 0.127.0, 0.128.0, 0.129.0, 0.130.0, 0.131.0, 0.132.0, 0.133.0, 0.134.0, 0.135.0, 0.136.0, 0.137.0, 0.138.0, 0.139.0, 0.140.0, 0.141.0, 0.142.0, 0.143.0, 0.143.1, 0.144.0, 0.145.0, 0.146.0, 0.147.0, 0.148.0, 0.149.0, 0.150.0, 0.150.1, 0.151.0, 0.152.0, 0.153.0, 0.154.0, 0.155.0, 0.155.1, 0.156.0, 0.157.0, 0.158.0, 0.159.0, 0.160.0, 0.160.1, 0.160.2, 0.161.0, 0.162.0, 0.162.1, 0.163.0, 0.164.0, 0.165.0, 0.165.1, 0.166.0, 0.166.1, 0.167.0, 0.167.1, 0.168.0, 0.169.0, 0.170.0, 0.171.0, 0.172.0, 0.173.0, 0.174.0, 0.174.1, 0.175.0, 0.175.1, 0.176.0, 0.176.1, 0.176.2, 0.176.3, 0.177.0, 0.178.0, 0.178.1, 0.179.0, 0.180.0, 0.180.1, 0.181.0, 0.181.1, 0.181.2, 0.182.0, 0.183.0, 0.183.1, 0.184.0, 0.185.0, 0.185.1, 0.185.2, 0.186.0, 0.187.0, 0.187.1, 0.188.0, 0.188.1, 0.188.2, 0.189.0, 0.190.0, 0.190.1, 0.191.0, 0.192.0, 0.193.0, 0.194.0, 0.195.0, 0.195.1, 0.195.2, 0.196.0, 0.196.1, 0.196.2, 0.196.3, 0.197.0, 0.198.0, 0.198.1, 0.198.2, 0.199.0, 0.199.1, 0.200.0, 0.200.1, 0.201.0, 0.202.0, 0.202.1, 0.203.0, 0.203.1, 0.204.0, 0.204.1, 0.205.0, 0.205.1, 0.206.0, 0.207.0, 0.208.0, 0.208.1, 0.209.0, 0.209.1, 0.210.0, 0.210.1, 0.210.2, 0.211.0, 0.211.1, 0.212.0, 0.213.0, 0.213.1, 0.214.0, 0.215.0, 0.215.1, 0.216.0, 0.216.1, 0.217.0, 0.217.1, 0.217.2, 0.218.0, 0.218.1, 0.219.0, 0.219.2, 0.219.3, 0.219.4, 0.219.5, 0.220.0, 0.220.1, 0.221.0, 0.222.0, 0.223.0, 0.223.2, 0.223.3, 0.224.0, 0.225.0, 0.225.1, 0.226.0, 0.227.0, 0.228.0, 0.229.0, 0.229.1, 0.229.2, 0.230.0, 0.231.0, 0.232.0, 0.233.0, 0.234.0, 0.235.1, 0.236.0, 0.237.0, 0.237.1, 0.237.2, 0.238.0, 0.238.1, 0.238.2, 0.238.3, 0.239.0, 0.239.1, 0.240.0, 0.241.0, 0.242.0, 0.242.1, 0.243.0, 0.244.0, 0.245.0, 0.245.1, 0.245.2, 0.246.0, 0.247.0, 0.247.1, 0.248.0, 0.248.1, 0.249.0, 0.250.0, 0.251.0, 0.251.1, 0.252.0, 0.253.0, 0.254.0, 0.254.1, 0.254.2, 0.255.0, 0.256.0, 0.257.0, 0.257.1, 0.258.0, 0.258.1, 0.259.0, 0.259.1, 0.260.0, 0.261.0, 0.261.1, 0.261.2, 0.262.0, 0.263.0, 0.264.0, 0.265.0, 0.265.1, 0.265.2, 0.265.3, 0.266.0, 0.266.1, 0.267.0, 0.268.0, 0.269.1, 0.270.0, 0.271.0, 0.272.0, 0.272.1, 0.272.2, 0.273.0, 0.273.1, 0.274.0, 0.274.1, 0.274.2, 0.275.0, 0.276.0, 0.277.0, 0.277.1, 0.278.0, 0.279.0, 0.280.0, 0.281.0, 0.282.0, 0.283.0, 0.284.0, 0.285.0, 0.286.0, 0.287.0, 0.288.0, 0.289.0, 0.290.0, 0.291.0, 0.292.0, 0.293.0, 0.294.0, 0.295.0, 0.296.0, 0.296.1, 0.297.0, 0.298.0, 0.299.0, 0.300.0, 0.301.0, 0.302.0, 0.303.0, 0.304.0, 0.305.0, 0.305.1, 0.306.0, 0.306.1, 0.307.0, 0.307.1, 0.308.0, 0.309.0, 0.310.0, 0.311.0, 0.312.0, 0.312.1, 0.313.0, 0.314.0, 0.315.0, 0.316.0

Source code repository url github.com

📊 Search Metrics

Difficulty 75/100

CPC $0.22

Competition 0.10

External References (2)

Github account flowjs

X (twitter) username flowtype

🏷️ Also known as

en flowjs

🔗 Connections

Programmed in 2

JavaScript, OCaml

MIT License

Developer 1

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

[2] ↑ flow — instance of (P31): software. wikidata.org.
[3] ↑ flow — developer (P178): Meta. wikidata.org.
[4] ↑ flow — copyright license (P275): MIT License. wikidata.org.
[5] ↑ flow — programmed in (P277): Q2005. wikidata.org.
[6] ↑ flow — programmed in (P277): OCaml. wikidata.org.
[7] ↑ flow — software version identifier (P348): 0.117.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[8] ↑ flow — software version identifier (P348): 0.117.1. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[9] ↑ flow — software version identifier (P348): 0.118.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[10] ↑ flow — software version identifier (P348): 0.119.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[11] ↑ flow — software version identifier (P348): 0.119.1. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[12] ↑ flow — software version identifier (P348): 0.120.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[13] ↑ flow — software version identifier (P348): 0.120.1. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[14] ↑ flow — software version identifier (P348): 0.121.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[15] ↑ flow — software version identifier (P348): 0.122.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[16] ↑ flow — software version identifier (P348): 0.123.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[17] ↑ flow — software version identifier (P348): 0.124.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[18] ↑ flow — software version identifier (P348): 0.125.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[19] ↑ flow — software version identifier (P348): 0.125.1. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[20] ↑ flow — software version identifier (P348): 0.126.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[21] ↑ flow — software version identifier (P348): 0.126.1. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[22] ↑ flow — software version identifier (P348): 0.127.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[23] ↑ flow — software version identifier (P348): 0.128.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[24] ↑ flow — software version identifier (P348): 0.129.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[25] ↑ flow — software version identifier (P348): 0.130.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.
[26] ↑ flow — software version identifier (P348): 0.131.0. github.com. Retrieved 2022-10-05. github.com. Provenance: wikidata.org.

Class ancestry

[1] ↑ flow is an instance of software (Q7397) [P31, primary]. Wikidata. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). flow. Retrieved April 25, 2026, from https://4ort.xyz/entity/flow-q111269149

MLA “flow.” 4ort.xyz Knowledge Graph, 4ort.xyz, 25 Apr. 2026, https://4ort.xyz/entity/flow-q111269149.

BibTeX

@misc{4ortxyz_flow-q111269149_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{flow}}, year = {2026}, url = {https://4ort.xyz/entity/flow-q111269149}, note = {Accessed: 2026-04-25}}

LLM prompt

According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): flow — https://4ort.xyz/entity/flow-q111269149 (retrieved 2026-04-25)

Canonical URL: https://4ort.xyz/entity/flow-q111269149 · Last refreshed: April 25, 2026

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

2d ago · Github-wiki-bot bot · 2026-05-30 view diff on Wikidata ↗

Software version identifier → 0.117.0, 0.117.1, 0.118.0 +286

"/* wbeditentity-statements-single-property-update:1||2 */ [[Property:P348]], Update with GitHub data ([[:toollabs:editgroups/b/CB/630537196441|details]])"
3d ago · Github-wiki-bot bot · 2026-05-29 view diff on Wikidata ↗

Software version identifier → 0.117.0, 0.117.1, 0.118.0 +286

"/* wbeditentity-statements-single-property-update:1||2 */ [[Property:P348]], Update with GitHub data ([[:toollabs:editgroups/b/CB/29315ebae732|details]])"
18d ago · Github-wiki-bot bot · 2026-05-14 view diff on Wikidata ↗

Software version identifier → 0.117.0, 0.117.1, 0.118.0 +286

"/* wbeditentity-statements-single-property-update:1||2 */ [[Property:P348]], Update with GitHub data ([[:toollabs:editgroups/b/CB/80674f16604d|details]])"
25d ago · Github-wiki-bot bot · 2026-05-07 view diff on Wikidata ↗

Software version identifier → 0.117.0, 0.117.1, 0.118.0 +286

"/* wbeditentity-statements-single-property-update:1||2 */ [[Property:P348]], Update with GitHub data ([[:toollabs:editgroups/b/CB/7b725c736964|details]])"
27d ago · Github-wiki-bot bot · 2026-05-05 view diff on Wikidata ↗

Software version identifier → 0.117.0, 0.117.1, 0.118.0 +286

"/* wbeditentity-statements-single-property-update:1||2 */ [[Property:P348]], Update with GitHub data ([[:toollabs:editgroups/b/CB/690ae2559083|details]])"
4w ago · Github-wiki-bot bot · 2026-04-30 view diff on Wikidata ↗

Copyright status → —

Source code repository url → https://github.com/facebook/flow

Twitter → —

Copyright license → MIT License

+ 20 other properties edited (see Wikidata diff for full list)

"/* wbeditentity-statements-single-property-update:1||2 */ [[Property:P348]], Update with GitHub data ([[:toollabs:editgroups/b/CB/bff13ffb1111|details]])"

Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.

flow

flow

Summary

Key Facts

Related Entities

References

Direct Wikidata claims

Class ancestry

📑 Cite this page

Edit History