Grammarly vs Writefull

Grammarly

• People who write across many apps and want the same checks in each
• Teams of up to 149 that need a shared style guide and brand tone
• Students who want citation, plagiarism and AI-detection checks in one editor

Writefull

• Researchers and students writing papers or theses in English
• LaTeX users who want language checks inside Overleaf
• Departments that want one group license for up to 100 people

Grammarly

• The Free plan is capped at 100 AI prompts a month and leaves out full-sentence rewrites and tone adjustments.
• Pro costs $30 per member a month on monthly billing, against $12 a month when billed annually.
• Pro stops at 149 seats; larger organizations need Enterprise, which is priced through sales.
• Advanced grammar, clarity and tone suggestions cover six languages; the other supported languages get spelling and basic grammar only.

Writefull

• The Free plan has a daily quota on language suggestions and writing features.
• Writefull Revise and Writefull Cite are not part of Premium or Group plans; they need an institutional license.
• Writefull's own language models give feedback on English text only; other languages go through GPT.
• It runs inside Word, Overleaf and a browser. The terms of use state that refunds are not issued.

Grammarly

Grammar, spelling and tone checks

Corrects spelling and grammar and shows the tone of a message on every plan. Full-sentence rewrites and one-click tone adjustments are part of Pro.

Works inside other apps

Desktop apps for Windows and Mac, extensions for Chrome, Safari, Firefox and Edge, and iPhone, iPad and Android apps bring suggestions into tools such as Gmail, Google Docs, Word and Slack.

Docs and AI agents

Docs is a browser-based document editor with agents including AI Grader, Citation Finder, Reader Reactions, Humanizer and Paraphraser. Some agents are limited to Pro.

Generative AI prompts

Drafts and reworks text from a prompt. The allowance is 100 prompts a month on Free, 2,000 per member on Pro and unlimited on Enterprise.

Plagiarism and AI detection

Scans a document for text that matches other sources and for passages likely to be AI-generated. The plans page lists both checks under Pro.

Team style controls

Pro team accounts get style guides, brand tones, knowledge share, snippets and usage analytics, so a group writes with the same terms and voice.

Writefull

Language edits for research writing

Suggests grammar and word-use corrections from Writefull's own models, which are trained on journal articles and cover English only.

GPT edits for other languages

Switching the language check to GPT revises non-English text in Overleaf. Premium adds a custom prompt to steer those edits; Word does not have the switch yet.

Rewriting tools

Paraphrase a passage, make it concise, scientific or punchy, split or join sentences, and get synonyms that fit the sentence.

Title and Abstract Generators

Suggests titles from a selected passage and drafts an abstract from the full text. Both run on Writefull's own models.

LaTeX help in Overleaf

TeXGPT writes LaTeX on request, and the Table and Equation Generators turn a prompt or an uploaded image into LaTeX code.

Ask AI in Word

An assistant inside the Word add-in answers writing questions, either asked freely or about a selected word or passage.

Grammarly

• Free$0

  Spelling and grammar corrections, tone detection and 100 AI prompts a month, for individuals.

• Pro$12

  per member / month, billed annually ($30 billed monthly)

  Full-sentence rewrites, tone adjustments, style guides and brand tones, and 2,000 AI prompts a month. Sold for 1 to 149 seats.

• EnterpriseCustom

  Unlimited members and AI prompts, dedicated support, confidential mode, granular roles and data loss prevention. Sold through Superhuman Go.

Writefull

• Free$0

  Limited daily use of language edits, rewriting features, TeXGPT, Ask AI and the LaTeX generators. The quota resets the next day.

• Premium$12.50

  per month, billed annually ($150); $17 quarterly; $21 monthly

  Unlimited suggestions and feature use, under a fair use policy, across Writefull for Word, Writefull for Overleaf and Writefull X.

• Group$135

  per additional user / year for seats 2 to 49; first seat $150

  Annual Premium access for 2 to 100 people with an admin portal for inviting members. Seats beyond the 49th cost less, down to $105.

• InstitutionCustom

  Priced on expected student and researcher numbers. Covers all five tools, adding Writefull Revise and Writefull Cite.

Grammarly

• Annual discount

  Save up to 60% with yearly billing

  Pro is $12 per member a month when billed annually and $30 when billed monthly. The plan toggle advertises a saving of up to 60% on yearly billing.

• Education

  Discounts for educational institutions

  The plans page FAQ says Grammarly offers discounts for educational institutions. Grammarly for Education is quoted through its education sales team.

Writefull

• Annual discount

  About 40% less with annual billing

  Premium is $150 billed once a year, equal to $12.50 a month, against $21 billed monthly. Quarterly billing is $51, or $17 a month.

• Education

  15% student discount for recommending Writefull

  Students who email a staff member at their institution about Writefull for Institutions, copying Writefull in, get 15% off a Premium plan.

• Other savings

  Group license discounts for 2 to 100 people

  A group license lowers the yearly price per seat as the group grows, from $150 for the first seat to $135 for seats 2 to 49 and less beyond that.