Synonyms API
Dictionaries · Operational · 30d uptime 92.31%
Free online thesaurus with synonym and antonym definitions for many languages, including visual diagrams, audio pronunciations, translations, etymologies, usage examples and more ...
Trust signals
Pricing
FREE
Auth
API_KEY
CORS
No
Rate limit
Not documented
Health
444ms
Trust score
85 (B)
Last checked Oct 13, 2026 · uptime 24h 100% / 7d 100% / 30d 92.31%
Strong candidate; weakest signal is CORS.
Links
- Homepagewww.synonyms.com
- Documentationwww.synonyms.com/synonyms_api.php
- Base URLwww.synonyms.com/synonyms_api.php
Integration checklist
- Auth is API_KEY
- No CORS — route calls through your backend.
- Rate limit: Not documented