Best AI Writing Tools of 2027
Seven tools, six identical briefs — a product description, a how-to introduction, a cold email, a landing page, a technical explainer and a rewrite of a badly written paragraph. Two editors scored every output blind, counted how much editing it needed, and checked every factual claim. We also read what each vendor does with the text you give it.
Claude (Pro) - The best long-form and technical writing in our test, with Projects that hold your style guide and source material across a whole body of work Tested Aug 2026 by Team RankingRight
- Both editors ranked its technical explainer and long-form draft first
- Held the brief and the tone across 1,500 words without drifting
- Projects keep a style guide and source documents attached to everything you write
ChatGPT (Plus) - The most versatile of the lot: writing, images, data analysis, browsing and custom GPTs in one subscription, with the largest ecosystem around it Tested Aug 2026 by Team RankingRight
- Scored level with Claude on editing needed across the six briefs
- Images, charts, data analysis and browsing in the same subscription
- Custom GPTs let a team share a configured writer
Grammarly (Pro) - The editor rather than the writer: it works inside every app you already type in and makes your own writing clearer Tested Aug 2026 by Team RankingRight
- Works in Gmail, Docs, Word, Slack and the browser — no copying between tools
- Caught every real grammar issue our editors flagged in the rewrite brief
- $12 a month, and the free tier is genuinely useful
Jasper (Pro) - Built for marketing teams: trainable brand voices, campaign workflows and templates for every asset a launch needs Tested Aug 2026 by Team RankingRight
- Brand voice trained on our sample copy and held it across all six briefs
- Campaign feature generates a whole asset set from one brief
- Templates for ads, emails, product pages and social
Notion AI (Business add-on) - Writing inside the documents your team already keeps, with your own wiki as the context — summarise, draft and rewrite without leaving the page Tested Aug 2026 by Team RankingRight
- Answers from your own wiki and cites the page it took them from
- No copying between a chat window and a document
- $10 a member on top of a plan you already pay for
Writesonic (Individual) - SEO-first drafting: it pulls the live search results for a keyword and builds an article brief around them before it writes Tested Aug 2026 by Team RankingRight
- Builds an outline from the current top-ranking pages for a keyword
- Cites the sources it browsed, which made fact-checking faster
- Bulk article generation and a WordPress publisher
Copy.ai (Starter) - A workflow engine more than a writer: it chains research, drafting and enrichment into repeatable go-to-market automations Tested Aug 2026 by Team RankingRight
- Workflows repeat a whole process — research a company, draft an email, enrich a list
- Infobase stores product facts so output stays consistent
- Free tier of 2,000 words a month
More to consider
These 5 come from retailer catalogs. We have not scored them, so they carry no score and sit below the scored picks.
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What separates the best AI writing tools?
Score and price don't move together here. Claude sits at 8.8 for $20, ChatGPT at 8.7 for $20, and Jasper at 8.0 for $69. Both editors ranked Claude's technical explainer and long-form draft first, and it held the brief and tone across 1,500 words without drifting. ChatGPT scored level with Claude on editing needed across the six briefs, and adds images, charts, data analysis and browsing in the same subscription.
Grammarly is the editor, not the writer. It scored 8.4 at $12, caught every real grammar issue our editors flagged in the rewrite brief, and works in Gmail, Docs, Word, Slack and the browser. As a generative writer it scored 5.
Below that, the tools specialise. Notion AI (7.9, $10) answers from your own wiki and cites the page. Writesonic (7.8, $39) builds an outline from the current top-ranking pages for a keyword. Copy.ai (7.7, $49) chains research, drafting and enrichment into repeatable workflows.
What should you check before buying?
We weight output quality at 30, control and brand voice at 20, workflow and integrations at 20, accuracy and disclosure at 15, and value at 15. Read your own priorities against those.
- Editing load. Writesonic's prose is serviceable rather than good — editing score 5. Copy.ai's long-form drafts needed the most editing after Grammarly.
- Brand voice. Jasper's brand voice trained on our sample copy and held it across all six briefs. ChatGPT's tone drifted toward generic marketing language on two briefs.
- Accuracy. Claude still produced one unsupported claim across the six briefs. Writesonic cites the sources it browsed, which made fact-checking faster.
- Data handling. ChatGPT's consumer tiers train on your chats unless you turn it off.
- Real cost. Jasper is $39 a seat against $20 for the general assistants that outscored it. Writesonic's credit system makes the real cost hard to predict.
Long-form and technical writers
Claude. Projects keep a style guide and source documents attached to everything you write.
One subscription for mixed work
ChatGPT. Custom GPTs let a team share a configured writer.
Improving your own writing
Grammarly. The free tier is genuinely useful, and $12 a month is the lowest price on this page.
Marketing teams
Jasper. Campaign generates a whole asset set from one brief, with templates for ads, emails, product pages and social.
Teams already in Notion
Notion AI. No copying between a chat window and a document.
SEO drafting at volume
Writesonic. Bulk article generation and a WordPress publisher.
Repeatable go-to-market processes
Copy.ai. Infobase stores product facts so output stays consistent, and the free tier covers 2,000 words a month.
For long-form and technical work, Claude holds a brief and a style guide across a whole body of work. ChatGPT suits anyone who wants writing, images, data analysis and browsing in one $20 subscription, while Grammarly at $12 is the pick if you want your own writing edited rather than generated. Marketing teams should look at Jasper, Notion users at Notion AI, SEO drafters at Writesonic, and anyone automating a repeatable process at Copy.ai.
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Questions about best ai writing tools of 2027
*Scores: Output quality 30 · Control & brand voice 20 · Workflow & integrations 20 · Accuracy & disclosure 15 · Value 15; score = Σ ÷ 10. Prices shown were checked on the date beside each and may change. Affiliate links are added only after a score is locked and can never change it. How we rank.