+ Cross-platform

ULAPI is written in C++, and has been incorporated into applications on iOS, macOS, Windows, Android, and Linux, using Swift, Objective C, Java, C++, and Python. It is also available as an HTTP-based API.

+ Multi-lingual

Monolingual ULAPI features (e.g. verb conjugation and lemmatization/root-word finding) are available in English, French, Spanish, German, Italian, Portuguese, Dutch, Russian, and Latin.

Our bilingual dictionary datasets include the following. All datasets support lookup in both directions (e.g. both Spanish-to-English and English-to-Spanish for our Spanish-English dataset).

• Spanish-English
• French-English
• German-English
• Italian-English
• Portuguese-English
• Dutch-English
• Latin-English
• Russian-English
• French-Spanish
• French-German
• French-Italian
• French-Portuguese
• German-Italian
• German-Spanish
• Portuguese-Spanish
• Dutch-French
• Dutch-Spanish
• Dutch-German
• Italian-Portuguese
• Italian-Spanish

We also have a monolingual dictionary and a thesaurus for both English and French.

+ Translation dictionary look-up

Specify a word in a source language, and obtain translations and definitions in a target language. Each translation comes with detailed part-of-speech information. This works for multi-word phrases as well (e.g. "take over" or "put down") if the phrase has a corresponding entry in the dictionary.

Example: Look up dog in English-to-French, and get chien [noun, masculine], chienne [noun, feminine], and pitou [noun, masculine, dialect=Quebec, tone=Colloquial].

+ Lemmatization / stemming / root-word discovery

Specify a word and obtain a complete list of its root forms.

Examples: Lemmatize rakes in English to get information about both rake [noun] and rake [verb]. ULAPI stemming works for compound forms as well as single-word forms, so for example, will have thrown will lemmatize to throw.

+ Verb conjugation

Specify a verb in a language, and obtain a complete list of its conjugated forms.

Example: Conjugate dormir ("to sleep") in Spanish and get a list of forms like (tense=present, person=first, number=singular: duermo), etc.

+ Pluralization and singularization

Specify a word and obtain its singular and/or plural form(s).

Example: Pluralize the English word forum to get both forums and fora. Singularize patches to get patch.

+ Number translation

Specify a number to get the word form of that number.

Example: 123 in German gives you hundertdreiundzwanzig.

+ Word structure analysis (also known as morphological analysis)

Specify a word and obtain an analysis of the word's structure based on each of its root forms.

Example: the word bakers is the plural form of baker [noun], which is in turn the "one who does something" form of the bake [verb].

+ Word inflection (also known as morphological synthesis)

Specify a word and obtain a list of all its derived forms, including detailed part of speech information.

Example: the complete inflection of the French adjective bleu includes bleu, bleus, bleue, and bleues, along with superlative and comparative forms like la plus bleue ("the most blue", feminine, singular).

+ Part-of-speech tagging

Provide a sentence or sentence fragment to obtain a list of the most likely parts of speech for each word, in context.

Example: the sentence William drinks two drinks at night gives you:

William [noun, singular, proper]
drinks [verb, third-person, singular, present tense]
two [adjective]
drinks [noun, plural]
at [preposition]
night [noun, singular]