QuillBot, Grammarly, Writesonic and Jasper do different jobs that all get called "AI writing". This guide compares them on the split that actually matters: rewriting what you wrote, proofreading it, or generating new text from a brief.
Premium, billed annually ($99.95/year). Monthly billing is $19.95/mo.
Pro, per member, billed annually. Monthly billing is $30/mo.
Chatsonic Individual plan, billed annually. See the pricing note in the comparison table.
Creator plan, billed annually. Monthly billing is $49/mo. No free plan — 7-day trial.
| QuillBot | Grammarly | Writesonic | Jasper | |
|---|---|---|---|---|
| Best for | Students & writers reworking their own drafts | Anyone who writes English at work or school | Bloggers & solo marketers producing drafts at volume | Marketing teams that need on-brand output |
| Main job | Paraphrase, summarize, check | Proofread and polish in place | Generate articles & copy from a brief | Generate campaign & brand content |
| Free option | Yes — paraphrasing limited to short passages and 2 modes | Yes — core checks plus 100 AI prompts/month | Free Chatsonic tier with limited generations | No free plan — 7-day free trial |
| Paid plans from | Premium $8.33/mo billed annually ($19.95 monthly) | Pro $12/member/mo billed annually ($30 monthly) | Chatsonic Individual $16/mo billed annually | Creator $39/mo billed annually ($49 monthly) |
| Standout included tools | 9 paraphrase modes, summarizer up to 6,000 words, plagiarism checks up to 25,000 words/month, citation generator | Full-sentence rewrites, tone adjustment, plagiarism and AI-text detection, 2,000 AI prompts/member/month on Pro | AI Article Writer, 100+ templates, Chatsonic with live web search, brand voice controls | Brand Voice, campaign workflows, Canvas editor, 50+ marketing templates |
| Languages | Paraphrasing in 23 languages | Focused on English text | Generation in 25+ languages | Generation in 30+ languages |
| Team use | Team plan available (quote-based) | Pro works for teams up to 149 seats, per-member pricing | Higher platform tiers add seats and projects | Pro up to 5 seats; Business plan is custom-priced |
| Trade-off to know | It reworks text — it is not a full article generator | English only in practice; generation features are prompt-based, not an article workflow | Pricing has two tracks (writing plans vs. the main platform from $79/mo) — check which one you are buying | Highest starting price here, and no permanent free tier to learn on |
Prices are USD, before tax, as published by the vendors in November 2026. Writesonic's main platform plans (an AI search-visibility product) start at $79/mo billed annually and are a different product from the writing plans shown here. Plans change — always confirm the current price and what's included on the vendor's site before you buy.
QuillBot is a rewriting suite built around its Paraphraser. The free plan limits paraphrasing to short passages in two modes (Standard and Fluency). Premium ($8.33/mo billed annually, $19.95/mo monthly) removes the length limit and unlocks all nine modes — including Formal, Academic, Simple, Creative, Expand and Shorten — plus a summarizer for texts up to 6,000 words, a citation generator, an AI detector, and plagiarism checks covering up to 25,000 words a month. It paraphrases in 23 languages, which is why it shows up in so many student and ESL workflows.
Grammarly checks spelling, grammar, punctuation and tone inside your browser, documents and email apps, rather than in a separate editor you have to paste into. The free plan covers the core checks plus 100 generative AI prompts a month. Pro ($12/member/mo billed annually, $30/mo monthly) adds full-sentence rewrites, tone adjustment, fluency suggestions, plagiarism detection, AI-text detection and 2,000 AI prompts per member per month, and it works for small teams as well as individuals.
Writesonic is the generation-first tool of the four: an AI Article Writer that turns a topic and keywords into a structured draft, a library of 100+ templates for ads, product descriptions and social posts, and Chatsonic, a chat assistant with live web search. The writing-focused Chatsonic Individual plan is $16/mo billed annually, with a limited free Chatsonic tier to try first. One thing to know before you compare prices: Writesonic's main site now also sells an AI search-visibility platform with plans from $79/mo billed annually — a different product from the writing plans this guide covers.
Jasper is a marketing content platform rather than a proofreader. Its core idea is Brand Voice: you train it on your style so generated blog posts, campaigns and social copy stay on-brand, and the Pro tier adds campaign workflows and a shared Canvas workspace. Creator ($39/mo billed annually, $49/mo monthly) covers one seat and one brand voice. Pro ($59/mo billed annually, $69/mo monthly) covers up to five seats and multiple brand voices. Business is custom-priced. There is no free plan, only a 7-day trial.
Rewriting your own draft → QuillBot. Checking English you already wrote → Grammarly. Producing new drafts from topics → Writesonic or Jasper. Most disappointment with these tools comes from buying a generator to do a proofreader's job, or the reverse.
Solo writers are usually served by QuillBot, Grammarly or Writesonic's entry plans. Jasper's price only starts to make sense when several people publish under one brand voice.
Every tool here discounts annual billing heavily — QuillBot's monthly price is more than double its annual rate, and Grammarly's is two and a half times. Price the plan you'll actually renew, including per-member costs for teams.
QuillBot, Grammarly and Writesonic all have free access; Jasper has a 7-day trial. Take a real assignment — an essay section, a blog draft, a client email — through two of them. The one whose output you edit least is your tool.
Maybe not. If you write occasionally, a general chatbot can paraphrase and proofread passably. These tools earn their price when you write every day: Grammarly checks text inside your apps, QuillBot's modes and citation tools are built for academic workflows, and Writesonic / Jasper add article structure, templates and brand voice that a blank chat window doesn't manage for you.
On published annual pricing, QuillBot Premium at $8.33/mo is the cheapest paid plan here, and Grammarly's free plan is the strongest $0 option for proofreading. Writesonic's writing plan starts at $16/mo billed annually; Jasper starts at $39/mo billed annually and is aimed at teams.
It depends on how you use it and on your school's rules, which always win. Rewriting and polishing your own drafts is a normal editing aid. Submitting text that a tool reworded from someone else's work — or AI-generated text presented as your own — is the kind of use plagiarism and AI detectors, and academic-integrity policies, are aimed at. When in doubt, disclose the assistance and ask your instructor.
For generation, Jasper (30+ languages) and Writesonic (25+ languages) publish the broadest language support, and QuillBot paraphrases in 23 languages. Grammarly is the exception: it is built for English text, so it won't proofread Japanese, Spanish or most other languages.
Because this guide is compiled from the vendors' published specifications and pricing, not from paid placements or invented testing. Where a judgment appears (for example, "poor value on monthly billing"), it is arithmetic on the published prices, shown next to it so you can judge for yourself.