Dictionaries APIs let you add dictionaries capabilities without building from scratch. Every entry below is profiled with trust signals — pricing model, authentication requirements, CORS support, rate limits, and live uptime checks — so you can compare options and pick production-safe choices instead of guessing from a link list.
| API | Pricing | Auth | CORS | Health | |
|---|---|---|---|---|---|
| ApyHub Translate Translate text between 50+ languages using ApyHub's translation utility API. | Free | No | Yes | Profile | |
| Chinese Character Web Chinese character definitions and pronunciations | Free | No | No | Profile | |
| Chinese Text Project Online open-access digital library for pre-modern Chinese texts | Free | No | Unknown | Profile | |
| Collins Bilingual Dictionary and Thesaurus Data | Free | API Key | No | Profile | |
| Free Dictionary Definitions, phonetics, pronounciations, parts of speech, examples, synonyms | Free | No | No | Profile | |
| HelloSalut Get hello translation following user language | Free | No | No | Profile | |
| Indonesia Dictionary API Indonesia dictionary many words | Unknown | Unknown | Unknown | Profile | |
| Lingua Robot Word definitions, pronunciations, synonyms, antonyms and others | Free | API Key | No | Profile | |
| Merriam-Webster Dictionary and Thesaurus Data | Free | API Key | No | Profile | |
| OwlBot API Definitions with example sentence and photo if available | Unknown | API Key | Yes | Profile | |
| Oxford Dictionary Data | Free | API Key | No | Profile | |
| Synonyms Synonyms, thesaurus and antonyms information for any given word | Free | API Key | No | Profile | |
| Wiktionary Collaborative dictionary data | Free | No | No | Profile | |
| Wiktionary API Wiktionary API: free dictionary data, word definitions, etymologies, and translations in 100+ languages. | Free | Unknown | Yes | Profile | |
| Wordnik Dictionary Data | Free | API Key | No | Profile | |
| Words Definitions and synonyms for more than 150,000 words | Free | API Key | No | Profile |
Start with pricing and auth: free tiers and no-auth APIs are fastest to prototype with. Then check CORS if your app calls the API from the browser, and health before you commit — a great API that's been down for a week will block your launch. Each profile below shows all of these signals plus rate limits where documented.