How Duolingo can use
Word Orb

Verified vocabulary infrastructure for Duolingo Max and 47 language pairs

perseverance
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The Scenario

Duolingo Max’s Roleplay feature lets learners practice conversation with AI characters. When a Spanish learner encounters “perseverance” in a Roleplay, the app needs a verified definition, a Spanish translation with native script, IPA pronunciation, and audio — not an LLM-generated guess that varies between sessions. One API call for the word. One for the lesson. One for the quiz. Deterministic content the AI-first strategy can trust.

1
Word Orb looks up the word
One API call returns a verified definition, 47 translations, pronunciation audio, and etymology.
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2
Lesson Orb delivers a structured lesson
A 5-phase lesson with the explorer teaching archetype.
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3
Quiz Orb assesses comprehension
Interactive assessment aligned to the lesson. Try it yourself.
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4
The Knowledge Graph connects everything
30,526 connections link words to lessons to assessments.
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Why this matters for Duolingo

Add Word Orb to Duolingo

Start with a company-ready review flow at Orb Verified, or open the quickstart if your team wants to test the API first.

162K
Words
19
Lesson Languages
24K
Assessments
30K
Graph Links

Technical Details

API Base: https://wordorb.ai

MCP Server: https://wordorb.ai/mcp

REST: curl https://wordorb.ai/api/word/courage -H "X-API-Key: YOUR_KEY"

GitHub: github.com/nicoletterankin/word-orb

Response format: Deterministic JSON · Sub-5ms edge delivery via Cloudflare Workers · No origin server

Get Orb Verified

Verified educational content for Duolingo. Nine gates. One standard. Trusted by schools.

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