Wordtune is an AI writing companion from AI21 Labs that rewrites and rephrases sentences and switches between casual and formal tones in real time. It runs on a freemium model: the Basic plan is free, and the cheapest paid tier, Advanced, starts at $4.89, billed annually — one of the lowest entry prices among the AI writing tools we track.
Who builds it
Wordtune is developed by AI21 Labs, an Israeli AI company, and the product is available at wordtune.com as a web app and browser extension.
What it does
Wordtune's core job, like QuillBot's, is rewriting sentences you've already written rather than generating new documents from a prompt. Highlight a sentence and Wordtune offers alternative phrasings, and you can nudge the tone toward more casual or more formal with a single click. The free Basic plan includes 10 rewrites and AI suggestions per month; paid plans (Advanced, Unlimited, Business) remove or raise that limit. Because it works sentence-by-sentence, Wordtune doesn't publish a context-window figure, a named underlying base model, or per-token API pricing the way general-purpose assistants do — its unit of work is a sentence, not a document.
Core features
- Freemium pricing: Basic plan free, Advanced plan from $4.89 (billed annually)
- Real-time tone switching between casual and formal phrasing
- Sentence-level rewrite suggestions rather than long-form generation
- Business plan built for teams of three or more
- Browser extension for rewriting inline across other apps and websites
Who it's for
Wordtune suits people who already have a draft and want to polish individual sentences — emails, messages, short documents — rather than generate long-form content from scratch; it competes most directly with QuillBot and with Grammarly's rewrite features rather than with prompt-based assistants like ChatGPT. The free Basic tier is enough for occasional touch-ups, and the $4.89 Advanced plan suits people who rewrite daily. The Business plan adds shared access for teams of three or more that want the same rewriting tool across the organization, which makes Wordtune a reasonable pick for customer-facing teams (support, sales) that want everyone's outbound messages to read more polished without adopting a full grammar suite.
Wordtune's browser extension is also worth calling out on its own: because it works inline in whatever app or website you're already typing into — email, chat, a CMS — it fits into an existing writing habit rather than requiring you to draft somewhere else and paste the result back in, which is a meaningfully different workflow than copy-pasting into a chat-based assistant.
Data and compliance
Wordtune does not publish a public API, a SOC 2 report, or a specific GDPR/EU-hosting statement in the sources we track, even though its parent company, AI21 Labs, is an active LLM vendor in its own right. That gap in our sources doesn't confirm the opposite is true — it only means these specific certifications aren't documented for Wordtune as a product. Teams with strict data-handling requirements should confirm Wordtune's current privacy terms directly before using it on sensitive text.