Best AI writing assistants: Jasper vs Writesonic vs Grammarly
Short answer
These three now do very different jobs. Grammarly ($12 a month billed yearly) polishes everyday writing everywhere you type. Jasper ($59 to $69 per seat) keeps marketing content on-brand for teams. Writesonic (from $79) has become a tool for tracking and improving how brands appear in AI search answers. For drafting alone, a $20 chatbot plan is often enough.
"AI writing assistant" now covers very different products. Here is how the three best-known compare, using their pricing pages and published user reviews, checked on the date above.
At a glance
| Grammarly | Jasper | Writesonic | |
|---|---|---|---|
| Best for | Everyday writing in any app | Marketing teams that need on-brand content | SEO teams tracking AI search visibility |
| Starting price | Free; Pro $12/mo billed yearly | Pro $59/seat yearly, $69 monthly | Starter $79/mo |
| Free option | Free plan | 7-day trial | Free trial |
| Standout feature | Works in browsers, email and docs | Brand Voice and marketing agents | Tracks brand mentions across AI assistants |
Sources: Grammarly plans, Jasper pricing, Writesonic pricing. Grammarly's $12 is the yearly-billed rate; monthly billing is reportedly about $30 (third-party source).
Grammarly
Grammarly checks spelling, grammar, clarity and tone as you type in your browser, email and documents, and its AI can rewrite sentences or draft replies. The company behind it renamed itself Superhuman in 2025, but Grammarly continues under its own name. Reviewers' main complaints: it can over-correct and flatten your voice, the pop-ups get in the way, and its AI-text detector sometimes flags human writing.
Choose it if you want better everyday writing with minimal effort.
Jasper
Jasper is a marketing content platform. Pro ($59/seat yearly) includes a canvas for campaigns, marketing agents, two Brand Voices, stored brand knowledge, image generation and a plagiarism checker. Business (custom pricing) adds custom agents, translation, API access and admin controls. G2 reviewers rate Brand Voice highly but say raw output needs editing and the price is steep for solo users.
Choose it if you run content for a brand with several writers.
Writesonic
Writesonic has shifted to "generative engine optimization": its plans track how your brand appears in answers from ChatGPT, Gemini and Google AI Overviews and include a monthly quota of AI-written articles (15 on Starter at $79, up to 50 on Growth at $399). Reviewers say output quality varies and facts need checking.
Choose it if you're an SEO or marketing team that wants to monitor AI search visibility.
Do you need any of them?
For drafting emails, posts and articles, a $20 chatbot plan such as ChatGPT Plus or Claude Pro often does the job as well as a dedicated writing tool; see ChatGPT vs Claude vs Gemini. Grammarly is still worth adding for polishing text across every app, and Jasper earns its price only with a team.
Frequently asked questions
Is Jasper better than ChatGPT for writing?
For general drafting, not necessarily; reviewers often find Jasper's output generic without editing. Jasper's advantage is team features for marketing, such as Brand Voice, saved brand knowledge and approval workflows, which a general chatbot does not provide.
Is Grammarly still free?
Yes. Grammarly's free plan includes spelling and grammar checks, tone detection and 100 AI prompts a month. Pro adds rewrites, tone changes, plagiarism and AI-text detection and 2,000 prompts a month.
What happened to Writesonic?
Writesonic still writes articles, but it now positions itself mainly as a platform for monitoring and improving a brand's visibility in AI answers from ChatGPT, Gemini and Google AI Overviews, with plans starting at $79 a month.