Comparison

FormatJS vs Project Fluent

No leader: the top candidate FormatJS has only 0.10 confidence (low), below the 0.35 needed to declare a winner. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

FormatJS full profile →Project Fluent full profile →

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FormatJS65

Project Fluent44

Attribute comparison across 2 tools
Attribute	FormatJS	Project Fluent
Vioscale score	65 / 100low · 10%	44 / 100low · 24%
Pricing
Modelpricing.model	commercial	commercial
Price levelpricing.price_level	-	free
Security
Scorecardsecurity.scorecard	3.8	3.7
Vulnerabilitiessecurity.vulnerabilities	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=react-intl&per_page=100 · Last 12m: 0	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fprojectfluent%2Ffluent&per_page=100 · Last 12m: 0
Adoption
Dependent reposadoption.dependent_repos	57,947	0
Github starsadoption.github_stars	14,743	1,674
Activity
Commits last 30dactivity.commits_last_30d	100	0
Release
Cadence daysrelease.cadence_days	-	59
Historyrelease.history	20 items	10 items
License
Spdxlicense.spdx	-	Apache-2.0
Language
Primarylanguage.primary	TypeScript	JavaScript

Score

Vioscale score

FormatJS65 / 100low · 10%

Project Fluent44 / 100low · 24%

Pricing

Model

FormatJScommercial

Project Fluentcommercial

Price level

FormatJS–

Project Fluentfree

Security

Scorecard

FormatJS3.8

Project Fluent3.7

Vulnerabilities

FormatJSCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=react-intl&per_page=100 · Last 12m: 0

Project FluentCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fprojectfluent%2Ffluent&per_page=100 · Last 12m: 0

Adoption

Dependent repos

FormatJS57,947

Project Fluent0

Github stars

FormatJS14,743

Project Fluent1,674

Activity

Commits last 30d

FormatJS100

Project Fluent0

Release

Cadence days

FormatJS–

Project Fluent59

History

FormatJS20 items

Project Fluent10 items

License

Spdx

FormatJS–

Project FluentApache-2.0

Language

Primary

FormatJSTypeScript

Project FluentJavaScript

Capabilities

Feature-by-feature on the axes that matter for localization i18n. “-” means undocumented, not absent.

Capability comparison for Localization I18N
Capability	FormatJS	Project Fluent
Capabilities
Cldr plural rules	-	✓
Rtl bidi support	-	✓
Translation memory	-	✓
Glossary terminology	-	✓
In context editing	-	✗
Ota updates	-	✗
Self hostable	-	✓
Managed translation services	-	✗
Qa checks	-	✗

Capabilities

Cldr plural rules

FormatJS-

Project Fluent✓

Rtl bidi support

FormatJS-

Project Fluent✓

Translation memory

FormatJS-

Project Fluent✓

Glossary terminology

FormatJS-

Project Fluent✓

In context editing

FormatJS-

Project Fluent✗

Ota updates

FormatJS-

Project Fluent✗

Self hostable

FormatJS-

Project Fluent✓

Managed translation services

FormatJS-

Project Fluent✗

Qa checks

FormatJS-

Project Fluent✗

What each one is

The product in its own terms, so the numbers below have context.

FormatJS

Not documented yet.

Project Fluent

A localization system that enables translations to use the full range of grammatical features in their target language, including proper handling of plurals, gender, dates, times, numbers, and right-to-left text.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

FormatJS

Pricing not documented yet.

Project Fluent

Open source

as of 2026-08-21verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platform and deployment support comparison
Supports	FormatJS	Project Fluent
CLIPlatforms	✓	-

Platforms

CLI

FormatJS✓

Project Fluent–

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.