CATEGORY
Internationalization (i18n) 769 crates
Data as of 2026-07-25 (crates.io database dump, timestamp 2026-07-25T02:00:36Z). Source: crates.io · db-dump.tar.gz · methodology & corrections.
unicode-widthDetermine displayed width of `char` and `str` types
according to Unicode Standard Annex #11 rules.699,255,228MIT OR Apache-2.0
iana-time-zoneget the IANA time zone for the current system572,278,028MIT OR Apache-2.0
encoding_rsA Gecko-oriented implementation of the Encoding Standard459,421,125(Apache-2.0 OR MIT) AND BSD-3-Clause
icu_properties_dataData for the icu_properties crate452,308,258Unicode-3.0
icu_propertiesDefinitions for Unicode properties449,243,417Unicode-3.0
icu_providerTrait and struct definitions for the ICU data provider447,348,388Unicode-3.0
icu_collectionsCollection of API for use in ICU libraries.444,920,390Unicode-3.0
icu_normalizer_dataData for the icu_normalizer crate443,882,577Unicode-3.0
icu_normalizerAPI for normalizing text into Unicode Normalization Forms440,265,907Unicode-3.0
idna_adapterBack end adapter for idna424,505,687Apache-2.0 OR MIT
utf8_iterIterator by char over potentially-invalid UTF-8 in &[u8]403,900,333Apache-2.0 OR MIT
unicaseA case-insensitive wrapper around strings.335,333,043MIT OR Apache-2.0
zerotrieA data structure that efficiently maps strings to integers293,294,097Unicode-3.0
potential_utfUnvalidated string and character types290,662,419Unicode-3.0
icu_locale_coreAPI for managing Unicode Language and Locale Identifiers288,676,482Unicode-3.0
iana-time-zone-haikuiana-time-zone support crate for Haiku OS238,833,950MIT OR Apache-2.0
whoamiRust library for getting information about the current user and environment172,683,853Apache-2.0 OR BSL-1.0 OR MIT
icu_locid_transform_dataData for the icu_locid_transform crate161,186,365Unicode-3.0
utf16_iterIterator by char over potentially-invalid UTF-16 in &[u16]161,160,674Apache-2.0 OR MIT
write16A UTF-16 analog of the Write trait161,084,160Apache-2.0 OR MIT
icu_locidDeprecated crate!159,767,999Unicode-3.0
icu_provider_macrosProc macros for ICU data providers158,911,098Unicode-3.0
icu_locid_transformDeprecated crate!157,002,321Unicode-3.0
unicode-linebreakImplementation of the Unicode Line Breaking Algorithm91,878,366Apache-2.0
num-formatA Rust crate for producing string-representations of numbers, formatted according to international standards61,685,096MIT/Apache-2.0
unic-char-propertyUNIC — Unicode Character Tools — Character Property taxonomy, contracts and build macros58,130,041MIT/Apache-2.0
unic-commonUNIC — Common Utilities58,112,748MIT/Apache-2.0
unic-ucd-versionUNIC — Unicode Character Database — Version58,089,351MIT/Apache-2.0
unic-char-rangeUNIC — Unicode Character Tools — Character Range and Iteration58,082,000MIT/Apache-2.0
deunicodeConvert Unicode strings to pure ASCII by intelligently transliterating them. Suppors Emoji and Chinese.55,957,901BSD-3-Clause
finl_unicodeLibrary for handling Unicode functionality for finl (categories and grapheme segmentation)38,496,250(MIT OR Apache-2.0) AND Unicode-DFS-2016
unic-ucd-segmentUNIC — Unicode Character Database — Segmentation Properties26,327,046MIT/Apache-2.0
unic-segmentUNIC — Unicode Text Segmentation Algorithms26,249,703MIT/Apache-2.0
unic-langidAPI for managing Unicode Language Identifiers17,916,369MIT OR Apache-2.0
unic-langid-implAPI for managing Unicode Language Identifiers17,902,849MIT OR Apache-2.0
fluent-langnegA library for language and locale negotiation.14,184,918Apache-2.0 OR MIT
fluent-syntaxA low-level parser, AST, and serializer API for the syntax used by Project Fluent,
a localization system designed to unleash the…14,095,416Apache-2.0 OR MIT
fluent-bundleA low-level implementation of a collection of localization messages for a single locale for Project Fluent,
a localization system…14,034,064Apache-2.0 OR MIT
intl_pluralrulesUnicode Plural Rules categorizer for numeric input.14,021,627Apache-2.0/MIT
icu_locale_dataData for the icu_locale crate13,891,595Unicode-3.0
icu_localeAPI for Unicode Language and Locale Identifiers canonicalization13,866,720Unicode-3.0
intl-memoizerA memoizer specifically tailored for storing lazy-initialized intl formatters for Project Fluent,
a localization system designed…13,672,993Apache-2.0 OR MIT
icu_segmenterUnicode line breaking and text segmentation algorithms for text boundaries analysis11,019,317Unicode-3.0
unic-emoji-charUNIC — Unicode Emoji — Emoji Character Properties10,761,167MIT/Apache-2.0
icu_segmenter_dataData for the icu_segmenter crate10,433,812Unicode-3.0
icu_calendarDate APIs for Gregorian and non-Gregorian calendars10,037,081Unicode-3.0
icu_calendar_dataData for the icu_calendar crate9,671,753Unicode-3.0
fluentAn umbrella crate exposing the combined features of fluent-rs crates with additional convenience macros for Project Fluent,
a…9,642,768Apache-2.0 OR MIT
chardetngA character encoding detector for legacy Web content9,610,048Apache-2.0 OR MIT
fixed_decimalAn API for representing numbers in a human-readable form9,512,959Unicode-3.0
icu_decimalAPI for formatting basic decimal numbers in a locale-sensitive way9,386,499Unicode-3.0
icu_decimal_dataData for the icu_decimal crate8,987,537Unicode-3.0
icu_pluralsUnicode Plural Rules categorizer for numeric input7,701,555Unicode-3.0
any_asciiUnicode to ASCII transliteration7,330,889ISC
icu_plurals_dataData for the icu_plurals crate7,297,661Unicode-3.0
unic-langid-macrosAPI for managing Unicode Language Identifiers7,066,325MIT OR Apache-2.0
unic-langid-macros-implAPI for managing Unicode Language Identifiers7,065,320MIT OR Apache-2.0
icu_datetimeHuman-readable formatting of dates, times, and time zones in hundreds of locales6,891,974Unicode-3.0
irefUniform & Internationalized Resource Identifiers (URIs/IRIs), borrowed and owned.6,513,468MIT/Apache-2.0
icu_datetime_dataData for the icu_datetime crate6,479,390Unicode-3.0
icu_collatorAPI for comparing strings according to language-dependent conventions5,844,041Unicode-3.0
icu_collator_dataData for the icu_collator crate5,474,820Unicode-3.0
icu_provider_adaptersAdapters for composing and manipulating data providers.5,374,510Unicode-3.0
icu_listECMA-402 ListFormatter5,191,395Unicode-3.0
lexical-sortSort Unicode strings lexically4,939,588MIT OR Apache-2.0
static-irefBuild static IRI and IRI references at compile time4,636,762MIT/Apache-2.0
icu_timezoneAPI for resolving and manipulating time zone information4,532,231Unicode-3.0
icu_timezone_dataData for the icu_timezone crate4,397,261Unicode-3.0
iref-coreUniform & Internationalized Resource Identifiers (URIs/IRIs), borrowed and owned.4,381,542MIT/Apache-2.0
ixdtfParser for Internet eXtended DateTime Format4,249,098Unicode-3.0
i18n-embedTraits and macros to conveniently embed localization assets into your application binary or library in order to localize it at…4,167,980MIT
i18n-embed-flMacro to perform compile time checks when using the i18n-embed crate and the fluent localization system4,074,949MIT
i18n-configThis library contains the configuration stucts (along with their parsing functions) for the cargo-i18n tool/system.4,036,259MIT
i18n-embed-implMacro implementations for i18n-embed4,011,929MIT
random_wordEfficient functions for generating random words in many languages.3,825,768MIT
icu_list_dataData for the icu_list crate3,654,676Unicode-3.0
icu_casemapUnicode case mapping and folding algorithms3,481,296Unicode-3.0
stop-wordsCommon stop words in many languages3,366,439MIT OR Apache-2.0
icu_casemap_dataData for the icu_casemap crate3,353,402Unicode-3.0
focacciano_std implementation of Unicode case folding comparisons2,981,779MIT AND Unicode-3.0
icu_provider_blobICU4X data provider that reads from blobs in memory2,922,475Unicode-3.0
temporal_rsTemporal in Rust is an implementation of the TC39 Temporal Builtin Proposal in Rust.2,861,347MIT OR Apache-2.0
unic-ucd-categoryUNIC — Unicode Character Database — General Category2,746,739MIT/Apache-2.0
resbUtilities for reading and writing ICU resource bundle files2,711,608Unicode-3.0
zoneinfo64Working with ICU zoneinfo64.res timezone data bundles2,707,648Unicode-3.0
rust-i18nRust I18n is use Rust codegen for load YAML file storage translations on compile time, and give you a t! macro for simply get…2,672,694MIT
icu_timeProcessing of dates, times, and time zones with a focus on i18n and interop2,368,227Unicode-3.0
icu_experimentalICU4X pre-release components under active development; all code in this crate is unstable.2,112,558Unicode-3.0
icu_time_dataData for the icu_time crate2,092,690Unicode-3.0
hypherhypher separates words into syllables.2,076,863MIT OR Apache-2.0
unic-ucd-bidiUNIC — Unicode Character Database — Bidi Properties2,031,294MIT/Apache-2.0
icu_experimental_dataData for the icu_experimental crate2,024,858Unicode-3.0
icuICU4X: International Components for Unicode, written in Rust1,893,450Unicode-3.0
trtr! macro for localisation1,533,421MIT
harfbuzz-sysRust bindings to the HarfBuzz text shaping engine1,484,180MIT OR Apache-2.0
idna_mappingUTS 46 mapping for unicode-rs back end of idna1,482,186(Apache-2.0 OR MIT) AND Unicode-3.0
unic-bidiUNIC — Unicode Bidirectional Algorithm1,429,895MIT/Apache-2.0
lexicmpLibrary for comparing and sorting strings lexicographically and naturally1,403,947MIT OR Apache-2.0
detoneDecompose Vietnamese tone marks1,149,960Apache-2.0 OR MIT
tai64TAI64 and TAI64N (i.e. Temps Atomique International) timestamp support for Rust1,047,041Apache-2.0 OR MIT
fluent-templatesTemplating for the Fluent localization framework1,015,726MIT/Apache-2.0
fluent-template-macrosTemplating for the Fluent localization framework997,448MIT/Apache-2.0
precis-profilesImplementation of the PRECIS Framework: Preparation, Enforcement,
and Comparison of Internationalized Strings…751,596MIT/Apache-2.0
precis-corePRECIS Framework: Preparation, Enforcement, and Comparison of
Internationalized Strings in Application Protocols as defined
in…745,248MIT/Apache-2.0
precis-toolsTools and parsers to generate PRECIS tables from the Unicode Character Database (UCD)742,892MIT/Apache-2.0
icu_capiC interface to ICU4X608,025Unicode-3.0
unic-ucd-normalUNIC — Unicode Character Database — Normalization Properties567,912MIT/Apache-2.0
unic-ucd-hangulUNIC — Unicode Character Database — Hangul Syllable Composition & Decomposition562,494MIT/Apache-2.0
unic-ucd-ageUNIC — Unicode Character Database — Age531,703MIT/Apache-2.0
icu_provider_fsICU4X data provider that reads from structured data files508,879Unicode-3.0
unic-normalUNIC — Unicode Normalization Forms504,809MIT/Apache-2.0
unic-ucd-commonUNIC — Unicode Character Database — Common Properties437,979MIT/Apache-2.0
fluent-pseudoA pseudolocalization and transformation API for Project Fluent,
a localization system designed to unleash the entire expressive…363,541Apache-2.0 OR MIT
fluent-fallbackA high-level implementation of a collection of locale bundles including fallback between locales for Project Fluent,
a…343,175Apache-2.0 OR MIT
east-asian-widthDetermine the display width of Unicode characters in East Asian contexts317,192MIT OR Apache-2.0
xmldeclExtracts an encoding from an ASCII-based bogo-XML declaration in text/html in a Web-compatible way287,944Apache-2.0 OR MIT
fluent-localeA library for language and locale negotiation.285,646Apache-2.0
harfbuzz_rsA high-level interface to HarfBuzz, exposing its most important functionality in a safe manner using Rust.269,333MIT
icu_codepointtrie_builderRuntime builder for CodePointTrie229,990Unicode-3.0
icu_locale_canonicalizerDeprecated crate!207,466Unicode-3.0
character_converterTurn Traditional Chinese script ot Simplified Chinese script and vice-versa and tokenize.202,480MIT
boa_icu_providerICU4X data provider for the Boa JavaScript engine.201,192Unlicense OR MIT
icu_locid_macrosproc-macros for icu_locid196,728non-standard
icu_unisetAPI for highly efficient querying of sets of Unicode characters196,715non-standard
icu_relativetimeRelative time formatting193,700non-standard
icu_codepointtrieAPI for an efficient trie of data for Unicode code points185,859non-standard
icu_relativetime_dataData for the icu_relativetime crate172,329non-standard
icu_provider_registryA registry of all ICU4X data markers166,978Unicode-3.0
unic-ucd-nameUNIC — Unicode Character Database — Name161,506MIT/Apache-2.0
icu_provider_sourceA data provider based on CLDR and ICU data.160,158Unicode-3.0
icu_provider_exportGenerate data for ICU4X DataProvider156,200Unicode-3.0
unic-ucdUNIC — Unicode Character Database154,736MIT/Apache-2.0
icu_compactdecimalCompact decimal153,868non-standard
unic-ucd-caseUNIC — Unicode Character Database — Case Properties151,398MIT/Apache-2.0
icu_testdataPre-built test data for ICU4X150,895Unicode-3.0
icu_displaynames_dataData for the icu_displaynames crate149,281non-standard
icu_compactdecimal_dataData for the icu_compactdecimal crate142,696non-standard
fast2sA fast Traditional Chinese to Simplified Chinese conversion library. Built with FST, faster than most of other libraries.141,883MIT
unic-ucd-blockUNIC — Unicode Character Database — Unicode Blocks141,259MIT/Apache-2.0
unic-ucd-name_aliasesUNIC — Unicode Character Database — Name Aliases137,086MIT/Apache-2.0
unic-idna-punycodeUNIC — Implementation of Punycode (RFC 3492) algorithm135,534MIT/Apache-2.0
chardetng_cC bindings for chardetng129,363Apache-2.0 OR MIT
json-gettextA library for getting text from JSON usually for internationalization.114,725MIT
rosetta-buildCode generation for the Rosetta i18n library.110,972ISC
icu_datagenGenerate data for ICU4X DataProvider108,092Unicode-3.0
rosetta-i18nEasy to use i18n library based on code generation.104,892ISC
unic-emojiUNIC — Unicode Emoji99,307MIT/Apache-2.0
unic-idnaUNIC — Unicode IDNA Compatibility Processing94,732MIT/Apache-2.0
unic-idna-mappingUNIC — IDNA — IDNA Mapping Table92,393MIT/Apache-2.0
qsv_currencyA library for representing international currencies.90,371MIT
country-boundariesA fast offline reverse country geocoder90,068Apache-2.0
unic-localeAPI for managing Unicode Locale Identifiers89,257MIT OR Apache-2.0
current_localeA library to get the user's current locale.86,135MIT OR Apache-2.0
textcodeText encoding/decoding library. Supports: UTF-8, ISO6937, ISO8859, GB231285,588MIT
unicUNIC: Unicode and Internationalization Crates83,141MIT/Apache-2.0
rlibphonenumberA high-performance Rust port of Google's libphonenumber for parsing, formatting, and validating international phone numbers.82,024Apache-2.0
unic-locale-implAPI for managing Unicode Locale Identifiers75,057MIT OR Apache-2.0
unic-charUNIC — Unicode Character Tools69,675MIT/Apache-2.0
unic-char-basicsUNIC — Unicode Character Tools — Basic Stable Character Properties67,049MIT/Apache-2.0
pseudolocalizePseudolocalization crate for Rust.64,483MIT
icu_casemappingDeprecated crate!61,492Unicode-3.0
ferucaAn implementation of the Unicode Collation Algorithm56,676MIT
unaccentA Rust crate to remove accents from strings, inspired by PostgreSQL's unaccent extension.55,991non-standard
isolanguage-1ISO 639-1 library with optional Serde support54,849MIT OR Apache-2.0
phonelibA comprehensive library for phone number validation, formatting, parsing, and manipulation53,138MIT
ucd-generateA program for generating packed representations of the Unicode character
database that can be efficiently searched.50,501MIT OR Apache-2.0
country-emojiConverts between country names, ISO 3166-1 codes and flag emojis.48,906MIT
opencc-jieba-rsHigh-performance Chinese text conversion and segmentation using Jieba and OpenCC-style dictionaries.48,617MIT
dioxus-i18ni18n integration for Dioxus apps based on Fluent Project.48,251MIT
bevy_fluentBevy plugin for localization using Fluent46,834MIT OR Apache-2.0
icu_unicodeset_parseAPI to parse unicode sets as defined in UTS3546,806non-standard
workflow-i18ni18n layer for `workflow-rs` framework46,440MIT OR Apache-2.0
icu_transliterateAPI for Transliteration46,281non-standard
language-enumA robust enum representing languages for global and regional applications.45,676MIT OR Apache-2.0
unic-locale-macros-implAPI for managing Unicode Locale Identifiers44,365MIT OR Apache-2.0
unic-locale-macrosAPI for managing Unicode Locale Identifiers43,927MIT OR Apache-2.0
fluent_contentFluent extension for easy access to message content.41,517MIT OR Apache-2.0
locale-typesIdiomatic types for locale identifiers.40,696MIT
formatoConvert numbers to string with customizable format39,448MIT OR Apache-2.0
codepage-stringsencode / decode strings for Windows code pages36,909MIT
twineLibrary for internationalization using the Twine file format36,308MIT OR Apache-2.0
keshvarcollection of all sorts of useful information for every country34,298BSD-3-Clause
locale-codeslocale-related codes/identifiers and any standards-based information concerning them.34,054MIT
cargo-i18nCargo sub-command to extract and build localization resources to embed in your application/library33,375MIT
tantivy-analysis-contribA set of analysis components for Tantivy32,194MIT OR Apache-2.0
fluent-static-codegenAutomatically generate Rust functions from Fluent message files for streamlined localization in Rust applications.31,075MIT
i18n-buildDesigned for use within the cargo-i18n tool for localizing crates. It has been published to allow its direct use within project…30,782MIT
iref-enumDerive macro for IRI-like enum types30,069MIT/Apache-2.0
charset-normalizer-rsTruly universal encoding detector in pure Rust - port of Python version29,531non-standard
fluent-staticAutomatically generate Rust functions from Fluent message files for streamlined localization in Rust applications.28,732MIT
time-formatA lightweight library for formatting Unix timestamps with millisecond precision in UTC and local time28,556MIT
yew-templateA crate for using separate HTML files as Yew objects, with support for seamless localization.28,375MIT
fluent-i18nA declarative and ergonomic internationalization for Rust using Fluent28,220Apache-2.0 OR MIT
language-matcherA language matcher with CLDR.27,901MIT
fluent-resmgrA standalone solution for managing resource files and returning locale bundles for Project Fluent,
a localization system designed…25,688Apache-2.0 OR MIT
languageTyped BCP47 language tags with built-in names, plural metadata, and conversion helpers.24,894GPL-3.0
lang-idConst lang-ids and maps are provided, mainly for i18n and l10n.24,031MIT/Apache-2.0
chinese_dictionaryA searchable Chinese / English dictionary with helpful utilities.22,965MIT
cskkC ABIから使う事を目的とした SKK(Simple Kana Kanji henkan)方式のかな漢字変換ライブラリ21,990GPL-3.0-or-later
unic-ucd-coreUNIC - Unicode Character Database - Version21,089MIT/Apache-2.0