Grammarly vs Jasper — Fact-Based Comparison

Criterion	Grammarly	Jasper
Category	AI Writing & Content Creation	AI Writing & Content Creation
In one sentence	A writing assistant that checks grammar, clarity, and tone as you type across websites and apps.	An AI platform for marketing teams that creates on-brand content using agents, workflows and a shared brand-knowledge layer.
Problem it solves	Catching grammar, spelling, and clarity issues everywhere you write, not just in one editor.	Helps marketing teams produce large volumes of consistent, on-brand content without rewriting brand guidelines into every prompt.
Free plan	Yes	No
Developer API	No	Yes — docs
Open source	No	No
Platforms	Web, Browser extension, Windows, macOS, iOS, Android	Web, Chrome extension, API
Pricing (summary)	Free tier covers core checks; Premium adds advanced suggestions. Verify current plans on Grammarly's site. Checked 2026-10-05	No permanent free plan is listed; a free trial of the Pro plan is available, and the Business plan adds custom agents, unlimited brand assets, API access and admin controls. Verify current plans on Jasper's pricing page. Checked 2026-10-13
Strengths	Works nearly everywhere you type Explanations teach as they correct	Built around brand consistency for teams rather than one-off prompts Workflow and automation tools aimed at scaled marketing content API access for bringing Jasper into your own CMS or products (Business plan)
Limitations	Suggestions are not always contextually right Full features need a paid plan	No permanent free plan is listed; ongoing use requires a paid subscription API access, custom agents and unlimited brand assets are limited to the Business plan AI-written marketing content still needs human fact-checking and editing