Grammarly vs Jasper (2026): Which AI Tool Is Better?

Both are popular AI writing assistants. Here is how Grammarly and Jasper stack up on price, strengths and weaknesses, and which one we would pick.

Grammarly

Writing assistant for grammar, tone and rewrites across 1 million+ apps

8.1 /10

Pricing: Free plan, paid from $30/mo

Pros

Works inside Google Docs, Word, Gmail, Outlook, Slack and 1 million+ apps and sites
Free grammar and spelling checks plus 100 AI prompts a month
Pro adds plagiarism and AI-text detection, AI Grader and rewrites
Real-time support in 20+ languages

Cons

Pro costs $30 monthly; the $12 price needs annual billing
Free plan is mostly grammar and spelling
Includes an AI Humanizer, which some schools and clients treat with suspicion
Now part of Superhuman; enterprise sales go through Superhuman Go

Visit Grammarly ↗

Jasper

Marketing content platform with brand voice, agents and image generation

7.3 /10

Pricing: Paid from $69/mo

Pros

Brand Voices, Knowledge assets and Audiences keep copy on-brand
Marketing agents for common workflows, GEO and translation agents on Business
Canvas workspace plus browser extension and integrations
30+ languages

Cons

No free plan, only a 7-day trial
$69/seat monthly is expensive for solo writers
Pro plan caps you at 2 Brand Voices and 5 Knowledge assets
API, Grid and custom agents only on the sales-led Business plan
Does not disclose which AI models it uses

Visit Jasper ↗

Grammarly vs Jasper at a glance

	Grammarly	Jasper
Editor score	8.1 / 10	7.3 / 10
Pricing model	Freemium	Paid
Starting price	$30/mo	$69/mo
Reader upvotes	0	0
Best for	grammar, editing, tone	marketing, copywriting, brand-voice
Model choice	No	No
Commercial use	No	No
No watermark (free)	No	No
API	No	Yes
Official MCP server	No	No
MCP client	No	No
Agent Skills	No	No
Brand kit	No	Yes
Teams	Yes	Yes
Content Credentials	No	No
Mobile app	No	No
20+ languages	Yes	Yes
Makes	Emails & newsletters, Blog posts & articles, Ad & marketing copy, Social media posts	Blog posts & articles, Ad & marketing copy, Social media posts, Emails & newsletters
AI models inside	0	0

Our pick

Grammarly edges it with a score of 8.1 versus 7.3. Grammarly is the better fit if you value: works inside google docs, word, gmail, outlook, slack and 1 million+ apps and sites, free grammar and spelling checks plus 100 ai prompts a month. Choose Jasper instead if you need: brand voices, knowledge assets and audiences keep copy on-brand, marketing agents for common workflows, geo and translation agents on business.