| Chinese Character Web | Chinese character definitions, pronunciations, and stroke data | No | ✗ | ✗ | |
| Chinese Text Project | Digital library and dictionary for pre-modern Chinese texts | No | ✓ | ? | |
| Collins | Bilingual dictionary and thesaurus data from Collins | apiKey | ✓ | ? | |
| Free Dictionary | Open-source dictionary API providing definitions, examples, and synonyms | No | ✓ | ? | |
| Indonesia Dictionary | Kamus Besar Bahasa Indonesia (KBBI) API for Indonesian word definitions | No | ✓ | ? | |
| Lingua Robot | Word meanings, pronunciations, synonyms, antonyms, and grammatical data | apiKey | ✓ | ✓ | |
| Merriam-Webster | Comprehensive dictionary and thesaurus API | apiKey | ✓ | ? | |
| OwlBot | Simple dictionary API with examples, pronunciation, and images | apiKey | ✓ | ✓ | |
| Oxford | Access word definitions, translations, and grammar data from Oxford Dictionaries | apiKey | ✓ | ✗ | |
| Synonyms | Retrieve synonyms, antonyms, and related words via API | apiKey | ✓ | ? | |
| Wiktionary | Collaborative, multilingual dictionary data from Wikimedia | No | ✓ | ✓ | |
| Wordnik | Large-scale English dictionary API with word definitions and usage examples | apiKey | ✓ | ? | |
| Words | Definitions, examples, and synonyms for over 150,000 words | apiKey | ✓ | ? | |