What are the best Dictionaries APIs?

The best Dictionaries APIs in 2026 have clear docs, reliable uptime, modern SDKs, and fair pricing. We curated top options to help you ship faster.

Are there free Dictionaries APIs?

Yes. Many Dictionaries APIs offer free tiers or trials suitable for hobby projects and prototypes.

How do I choose a Dictionaries API?

Evaluate documentation, auth method, SDKs, rate limits, pricing, and support. Start with a free tier, then upgrade as usage grows.

Best Dictionaries APIs (2026)

We curated the best Dictionaries APIs for developers. Browse 11+ options and compare features, docs, and pricing.

View all Dictionaries APIs →

Chinese Text Project

Dictionaries

Online open-access digital library for pre-modern Chinese texts

Collins

Dictionaries

Bilingual Dictionary and Thesaurus Data

Indonesia Dictionary

Dictionaries

Indonesia dictionary many words

Lingua Robot

Dictionaries

Word definitions, pronunciations, synonyms, antonyms and others

Merriam-Webster

Dictionaries

The Merriam-Webster Dictionary API gives developers access to a comprehensive resource of dictionary and thesaurus content as well as specialized medical, Spanish, ESL, and student-friendly vocabulary.

OwlBot

Dictionaries

Definitions with example sentence and photo if avaailable

Oxford

Dictionaries

Enhance your app with world-renowned dictionary data.

Perfect Tense

Dictionaries

The Perfect Tense API is an artificial intelligence powered spelling and grammar API. All you have to do is provide a piece of text and the Perfect Tense API will automatically return a proofread version of the text, along with all spelling and grammar mistakes.

Synonyms

Dictionaries

Synonyms, thesaurus and antonyms information for any given word

Wiktionary

Dictionaries

Collaborative dictionary data

WordsAPI

Dictionaries

Find definitions, related words, and more, with a simple to use RESTful API.

How we pick the best Dictionaries APIs

We consider documentation clarity, SDK availability, authentication type, community adoption, and overall developer experience. We recommend starting with free tiers where available.