QuillBot vs Writefull

QuillBot

• Students and writers who need to reword or shorten existing text
• People who want paraphrasing, grammar and citation tools in one account
• Teams of 2 or more that want centralized billing

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

QuillBot

• The free plan paraphrases at most 125 words at a time and offers only the Standard and Fluency modes.
• Free summaries are capped at 1,200 words; Premium raises the cap to 6,000.
• Plagiarism checking is a Premium feature and is limited to 25,000 words a month.
• The pricing page leads with annual billing at $8.33 a month; the iOS app lists monthly billing at $19.99.

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.

QuillBot

Paraphraser

Rewords text in built-in modes: Standard and Fluency on the free plan, 9 modes plus unlimited custom modes on Premium. It paraphrases in 23 languages.

Grammar Checker

Fixes basic grammar errors on the free plan and adds advanced writing suggestions and tone insights on Premium. Grammar correction covers 6 languages.

AI Detector and Humanizer

The AI Detector flags AI-generated content, and the Humanizer rewrites text so it reads more naturally. Free use of both is limited; Premium gives full access.

Summarizer and Translator

Summarizes up to 1,200 words on the free plan and 6,000 on Premium, which adds custom summaries. The Translator covers more than 40 languages.

Plagiarism and citation tools

Premium scans up to 25,000 words a month for accidental plagiarism, and the Citation Generator formats references in APA, MLA and Chicago styles.

Extensions and apps

Chrome, Edge and Safari extensions, a Word add-in, macOS and Windows apps, and iOS and Android keyboards and apps. Premium runs on up to 10 devices at a time.

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.

QuillBot

• Free$0

  Paraphrase up to 125 words in 2 modes, fix basic grammar errors, summarize up to 1,200 words, and use the Humanizer and AI Detector with limits.

• Premium$8.33

  per month, billed annually

  Full paraphrasing in 9 modes plus custom modes, advanced grammar suggestions, 6,000-word summaries, the full AI Detector and plagiarism checks on 25,000 words a month.

• Team Plan$7.50

  per seat / month, billed every 12 months ($89.95), for 2-10 seats

  All Premium features plus writer-management dashboards and centralized billing. $6.66 a seat for 11-50 seats and $5.83 for 51 or more.

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.

QuillBot

• Annual discount

  Annual billing marked as 58% off

  The pricing page labels annual billing 58% off the monthly rate, which brings Premium to $8.33 a month. In the iOS app the plans are $99.99 a year or $19.99 a month.

• Other savings

  Team seats cost 10% to 30% less

  Team plans are $7.50 a seat per month for 2-10 seats, $6.66 for 11-50 and $5.83 for 51 or more, billed every 12 months and labeled as 10%, 20% and 30% savings.

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.