Lingua Robot

linguarobot.io

English dictionary API providing access to word definitions, pronunciations, IPA transcriptions, synonyms, antonyms, lemmatization, inflections and morphemic analysis for over 800,000 English lexical entries.

The Lingua Robot API uses api key authentication; has freemium pricing; offers a free tier (Basic plan $0/month, 2500 requests/day then $0.004 each); rate limits: Daily request limits by plan (2500 to 2,500,000 requests/day). Verified 2026-07-12 with per-field source links.

Other Verified 2026-07-12 medium confidence

Base URL

not documented null

no source

Auth

api_key

linguarobot.io ↗

Free tier

Basic plan $0/month, 2500 requests/day then $0.004 each

linguarobot.io ↗

Pricing model

freemium

linguarobot.io ↗

Pricing

Basic $0/mo (2500 req/day, then $0.004 each); Pro $10/mo (25,000 req/day, then $0.0004 each); Ultra $49/mo (250,000 req/day, then $0.0002 each); Mega $99/mo (2,500,000 req/day, then $0.0001 each)

linguarobot.io ↗

Rate limits

Daily request limits by plan (2500 to 2,500,000 requests/day)

linguarobot.io ↗

OpenAPI spec

not documented null

no source

MCP server

not documented null

no source