# ICU vs Project Fluent

**Leader by vioscaleAI score:** ICU

| Attribute | ICU | Project Fluent |
|---|---|---|
| **vioscaleAI score** | 57.8 (53% (medium)) | 37.6 (52% (medium)) |
| activity.commits_last_30d | 63 | 0 |
| adoption.dependent_repos | 6,271 | 0 |
| adoption.github_stars | 3,616 | 1,680 |
| content.faq | `[{"answer":"ICU is a widely-used open-source library that provides Unicode text handling, internationalization services, and localization support for C, C++, and Java applications. It fills gaps in platform-native Unicode support, enabling portable text processing across operating systems and programming environments. It is indexed under Localization I18N.","source":"https://icu.unicode.org","question":"What is ICU?","confidence":0.6},{"answer":"ICU is open source, so it can be self-hosted and used at no licence cost. Pricing changes often, so verify at source before relying on it.","source":"https://icu.unicode.org","question":"Is ICU free to use?","confidence":0.6},{"answer":"ICU supports the web, Windows, macOS, Linux, iOS, Android and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://icu.unicode.org","question":"What platforms does ICU support?","confidence":0.6},{"answer":"We have confirmed 18 integrations for ICU, including Adobe, Amazon (Kindle), Apache, Apple, eBay, Google, Chrome and Android, plus 10 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://icu.unicode.org","question":"What does ICU integrate with?","confidence":0.6}]` | `[{"answer":"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. It is indexed under Localization I18N.","source":"https://projectfluent.org","question":"What is Project Fluent?","confidence":0.6},{"answer":"Project Fluent is open source, so it can be self-hosted and used at no licence cost. It is released under the Apache-2.0 licence. Pricing changes often, so verify at source before relying on it.","source":"https://projectfluent.org","question":"Is Project Fluent free to use?","confidence":0.6},{"answer":"Yes. Project Fluent is published under the Apache-2.0 licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/projectfluent/fluent","question":"Is Project Fluent open source?","confidence":0.95}]` |
| description.long | ICU is a widely-used open-source library that provides Unicode text handling, internationalization services, and localization support for C, C++, and Java applications. It fills gaps in platform-native Unicode support, enabling portable text processing across operating systems and programming environments. | 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. |
| features.capabilities | `{"cldr_plural_rules":true}` | `{"qa_checks":false,"ota_updates":false,"self_hostable":true,"rtl_bidi_support":true,"cldr_plural_rules":true,"in_context_editing":false,"translation_memory":true,"glossary_terminology":true,"managed_translation_services":false}` |
| integrations.count | 20 | - |
| integrations.list | `[{"name":"Adobe"},{"name":"Amazon (Kindle)"},{"name":"Apache"},{"name":"Apple"},{"name":"eBay"},{"name":"Google"},{"name":"Chrome"},{"name":"Android"},{"name":"Google Maps"},{"name":"Google Analytics"},{"name":"Gmail"},{"name":"Facebook (HHVM)"},{"name":"Microsoft"},{"name":"Eclipse"},{"name":"FreeBSD"},{"name":"Debian Linux"},{"name":"CouchDB"},{"name":"Firebird RDBMS"},{"name":"ESRI"},{"name":"CERN"}]` | - |
| language.primary | C++ | JavaScript |
| license.spdx | - | Apache-2.0 |
| market.availability | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"cli":true,"ios":true,"mac":true,"web":true,"linux":true,"android":true,"windows":true}` | - |
| pricing | `{"type":"open_source","sourceUrl":"https://icu.unicode.org","retrievedAt":"2026-08-19T14:45:32.725Z"}` | `{"type":"open_source","sourceUrl":"https://projectfluent.org","retrievedAt":"2026-08-21T13:20:47.821Z"}` |
| pricing.model | commercial | commercial |
| pricing.price_level | free | free |
| release.cadence_days | 49 | 59 |
| release.history | `[{"url":"https://github.com/unicode-org/icu/releases/tag/release-79.1rc","date":"2026-09-25T22:25:32Z","type":"prerelease","version":"release-79.1rc"},{"url":"https://github.com/unicode-org/icu/releases/tag/icu4x/2026-08-31/79.x","date":"2026-08-31T14:50:55Z","type":"prerelease","version":"icu4x/2026-08-31/79.x"},{"url":"https://github.com/unicode-org/icu/releases/tag/icu4x/2026-07-01/79.x","date":"2026-07-01T09:30:18Z","type":"prerelease","version":"icu4x/2026-07-01/79.x"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-78.3","date":"2026-03-17T20:23:47Z","type":"stable","version":"release-78.3"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-78.2","date":"2026-01-09T00:38:52Z","type":"stable","version":"release-78.2"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-78.1","date":"2025-10-30T17:21:37Z","type":"stable","version":"release-78.1"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-78.1rc","date":"2025-10-03T19:33:43Z","type":"prerelease","version":"release-78.1rc"},{"url":"https://github.com/unicode-org/icu/releases/tag/icu4x/2025-05-21/77.x","date":"2025-05-21T08:57:05Z","type":"prerelease","version":"icu4x/2025-05-21/77.x"},{"url":"https://github.com/unicode-org/icu/releases/tag/icu4x/2025-05-01/77.x","date":"2025-05-01T18:43:02Z","type":"prerelease","version":"icu4x/2025-05-01/77.x"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-77-1","date":"2025-03-13T18:00:27Z","type":"stable","version":"release-77-1"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-77-rc","date":"2025-02-21T21:42:35Z","type":"prerelease","version":"release-77-rc"},{"url":"https://github.com/unicode-org/icu/releases/tag/icu4x/2024-12-16/76.x","date":"2024-12-16T20:27:12Z","type":"prerelease","version":"icu4x/2024-12-16/76.x"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-76-1","date":"2024-10-24T17:22:31Z","type":"stable","version":"release-76-1"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-76-rc","date":"2024-09-30T21:35:03Z","type":"prerelease","version":"release-76-rc"},{"url":"https://github.com/unicode-org/icu/releases/tag/icu4x/2024-05-16/75.x","date":"2024-05-16T23:41:40Z","type":"prerelease","version":"icu4x/2024-05-16/75.x"},{"url":"https://github.com/unicode-org/icu/releases/tag/icu4x/2024-05-03/75.x","date":"2024-05-03T21:18:50Z","type":"prerelease","version":"icu4x/2024-05-03/75.x"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-75-1","date":"2024-04-16T00:57:15Z","type":"stable","version":"release-75-1"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-75-rc","date":"2024-03-29T00:25:41Z","type":"prerelease","version":"release-75-rc"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-74-2","date":"2023-12-11T19:06:58Z","type":"stable","version":"release-74-2"},{"url":"https://github.com/unicode-org/icu/releases/tag/release-74-1","date":"2023-10-27T23:28:23Z","type":"stable","version":"release-74-1"}]` | `[{"url":"https://github.com/projectfluent/fluent/releases/tag/v1.0.0","date":"2019-04-17T07:18:15Z","type":"stable","version":"v1.0.0"},{"url":"https://github.com/projectfluent/fluent/releases/tag/v0.9.0","date":"2019-03-26T12:55:42Z","type":"prerelease","version":"v0.9.0"},{"url":"https://github.com/projectfluent/fluent/releases/tag/v0.8.0","date":"2018-12-13T14:50:15Z","type":"prerelease","version":"v0.8.0"},{"url":"https://github.com/projectfluent/fluent/releases/tag/v0.7.0","date":"2018-10-15T14:32:25Z","type":"prerelease","version":"v0.7.0"},{"url":"https://github.com/projectfluent/fluent/releases/tag/v0.6.0","date":"2018-07-24T15:30:56Z","type":"prerelease","version":"v0.6.0"},{"url":"https://github.com/projectfluent/fluent/releases/tag/v0.5.0","date":"2018-01-31T18:46:29Z","type":"prerelease","version":"v0.5.0"},{"url":"https://github.com/projectfluent/fluent/releases/tag/v0.4.0","date":"2017-11-14T13:06:28Z","type":"prerelease","version":"v0.4.0"},{"url":"https://github.com/projectfluent/fluent/releases/tag/v0.3.0","date":"2017-10-18T10:17:03Z","type":"prerelease","version":"v0.3.0"},{"url":"https://github.com/projectfluent/fluent/releases/tag/v0.2.0","date":"2017-10-18T10:16:33Z","type":"prerelease","version":"v0.2.0"},{"url":"https://github.com/projectfluent/fluent/releases/tag/v0.1.0","date":"2017-10-18T10:15:50Z","type":"prerelease","version":"v0.1.0"}]` |
| security.scorecard | 9 | 3.7 |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=com.ibm.icu%3Aicu4j&per_page=100","last_12m":0,"max_severity":null}` | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fprojectfluent%2Ffluent&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Localization I18N)

| Capability | ICU | 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 | - | ✗ |

*Source: vioscaleAI. Generated 2026-10-16T20:50:18.691Z. "-" = undocumented, not absent.*