Grammarly vs Writesonic
Two writing AI tools compared on the facts: what each one does, how it charges, and where their capabilities overlap. We track tools, we don't rate them, so there is no winner declared here. The differences below should make the right pick for your use case obvious.
Grammarly
Grammar, style, and generative writing help across your apps
Grammarly checks grammar, spelling, punctuation, and tone, and can rewrite or generate text on demand. It works as a browser extension, desktop app, keyboard, and inside Microsoft Word and Google Docs.
Writesonic
AI agents for SEO, content, and generative engine optimization
Writesonic is an AI-powered platform featuring writing tools, the Sonic editor, and Photosonic for image generation. It helps users automate SEO workflows, create ranking content, and optimize visibility across search and generative engines.
At a glance
Swipe the table sideways to see both tools.
| Grammarly | Writesonic | |
|---|---|---|
| Price | Free plan, then $30/mo Free Free · Pro $30/mo · Enterprise Custom | From $79/mo Starter $79/mo · Basic $199/mo · Growth $399/mo · Enterprise Custom |
| Pricing model | freemium | freemium |
| Website | grammarly.com ↗ | writesonic.com ↗ |
| Shared capabilities | generative-writing | |
| Only here | grammar-checker spell-checker writing-assistant tone-detection | ai-agents seo-content image-generation marketing-content |
Capability tags are factual labels we assign when a tool is added; they describe what a tool does, not how well it does it.
Checked against the vendors. Written from each vendor's own site and last re-checked there: Grammarly on July 22, 2026 · Writesonic (not re-checked yet). Vendors change pricing and features without notice, so confirm anything that decides your purchase on the vendor's page.
Key features
Grammarly
- Grammar, spelling, and punctuation checks
- Tone and clarity suggestions
- Generative rewriting and drafting prompts
- Works in the browser, desktop, Word, Google Docs, and mobile
- Team style guides on Business plans
Writesonic
- Automates SEO workflows using AI agents
- Includes Article Writer 3.0 for long-form content
- Provides the Sonic editor for quick text creation
- Generates realistic images using Photosonic
What each one does well
Grammarly
- ✓ Catching typos and awkward phrasing across every app you write in
- ✓ Adjusting the tone of an email or message before you send it
- ✓ Team style consistency across many writers
Writesonic
- ✓ Automating SEO workflows and optimization
- ✓ Generating long-form articles and marketing content
- ✓ Creating AI-generated images of people, products, and places
Full fact sheets, FAQs, and discussion links: Grammarly · Writesonic · all writing tools