Wordtune
Free tierExpress yourself with confidence — AI-powered paraphrasing, rewriting, and writing assistant
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Wordtune — Technical Overview
Wordtune is a freemium AI writing assistant developed by AI21 Labs, offering paraphrasing, rewriting, grammar correction, summarization, and tone adjustment capabilities. It is delivered primarily as a browser extension, with integrations available for Chrome, Microsoft Edge, and iOS.
Pricing tiers:
- Free Basic: 10 rewrites/day, 3 AI summarizations/month
- Advanced: $4.89/month (billed annually) or $6.99/month — includes a 3-day free trial
- Unlimited: $6.99/month (billed annually) or $9.99/month — includes a 3-day free trial
Core capabilities:
- AI-powered paraphrasing and sentence rewriting
- Grammar and spelling correction
- Tone switching (formal ↔ casual)
- AI summarization of text and YouTube videos
- Contextual AI writing suggestions
- Translation into English from 10 languages
The underlying model is provided by AI21 Labs. Wordtune surfaces its functionality via browser extension rather than a publicly documented REST API; integration into developer workflows is achieved through the supported browser and iOS clients.