| Feature | Word Orb | Merriam-Webster API |
|---|---|---|
| Languages | 47 + native script | English + Spanish |
| Educational Content | 162K words + structured daily lessons + 45K+ assessments | - |
| API Response Time | <50ms edge | ~100ms |
| Knowledge Graph | 30K+ connections | - |
| Quizzes & Assessment | 45,916 assessments | - |
| Structured Lessons | structured daily lessons | - |
| Pronunciation Audio | 240K MP3 files | WAV files |
| Search | Prefix + fuzzy + definition + autocomplete | Suggestions on miss |
| Batch Requests | Up to 50 words | - |
| Pricing | Free 500/day, $29-$499/mo | Free (2 keys, 1K/day) |
| MCP Agent Support | 12 tools | - |
- One API returns all age tones - MW needs separate Learner's and Collegiate keys.
- 47 languages in every response - MW gives English and Spanish.
- Lessons and quizzes for complete learning experiences, not just lookups.
- Modern JSON with consistent schemas - MW's XML-legacy format needs careful parsing.
- MCP server for AI agents - MW has no agent integration.
Fair comparison: Merriam-Webster has unmatched American English authority and is the legal spelling standard in US courts.
Use the playground, inspect the JSON, and decide based on the shape of the product rather than the pitch.