Best Free AI Writing Tools

What separates the best free AI writing tools on this page?

Two tools sit at the top on output quality. Claude scores 8.8 and ChatGPT 8.7, and both were scored level on editing needed across the six briefs. Claude held a brief and tone across 1,500 words without drifting, and its Projects keep a style guide and source documents attached to everything you write. ChatGPT puts images, charts, data analysis and browsing in the same subscription, and custom GPTs let a team share a configured writer.

Grammarly is the editor rather than the writer. It scores 8.4 at $12 a month, works in Gmail, Docs, Word, Slack and the browser, and caught every real grammar issue our editors flagged in the rewrite brief. As a generative writer it scored 5.

Writesonic (7.8, $39) builds an outline from the current top-ranking pages for a keyword and cites the sources it browsed. Copy.ai (7.7, $49) chains research, drafting and enrichment into repeatable workflows, with a free tier of 2,000 words a month.

What should you check before buying?

Scoring weights output quality 30, control and brand voice 20, workflow and integrations 20, accuracy and disclosure 15, and value 15. Match those to how you actually write.

• Editing load: Writesonic's prose is serviceable rather than good, with an editing score of 5, and Copy.ai's long-form drafts needed the most editing after Grammarly.
• Voice: Grammarly suggestions can flatten a distinctive voice if accepted wholesale, and ChatGPT tone drifted toward generic marketing language on two briefs.
• Accuracy: Claude still produced one unsupported claim across the six briefs.
• Training: ChatGPT consumer tiers train on your chats unless you turn it off.
• Cost predictability: Writesonic's credit system makes the real cost hard to predict.

Long-form and technical writers

Claude suits anyone writing technical explainers or long drafts who wants a style guide and source material held across a body of work.

Teams that want one subscription for everything

ChatGPT fits writers who also need images, charts, data analysis and browsing, and teams that want to share a configured writer.

People editing their own writing

Grammarly is for anyone who types in Gmail, Docs, Word, Slack and the browser and wants clearer sentences without copying text between tools.

SEO-first drafting

Writesonic suits writers who want an outline built from the current top-ranking pages for a keyword, plus bulk generation and a WordPress publisher.

Repeatable go-to-market processes

Copy.ai is for teams that want to research a company, draft an email and enrich a list as one repeatable workflow, with product facts stored in Infobase.

Claude suits long-form and technical writers who want a style guide and source material held across a body of work. ChatGPT fits anyone who wants writing, images, data analysis and browsing in one subscription, while Grammarly is the pick for editing your own writing inside the apps you already use. Writesonic is for SEO-first drafting, and Copy.ai is for teams that want repeatable go-to-market workflows.