Is Grammarly better than Harper?

Grammarly ranks higher in our list of grammar and proofreading tools (#1 against #3, score 92.5 against 89.5). Grammarly is best for: everyday grammar checks across browsers and apps. Harper is best for: private, free grammar checks on your own device.

Which is cheaper, Grammarly or Harper?

Grammarly: Free plan; Pro $12 a month with a 7-day trial; Enterprise by sales contact. Harper: Free and open source under Apache-2.0; no paid tier listed.

Do Grammarly and Harper run on the same platforms?

Grammarly supports Web, Browser extension, iOS, Android. Harper supports macOS, Browser extension.

Comparison · Grammar and proofreading tools

Grammarly vs Harper: which is better in 2026?

Grammarly92.5#1 in best grammar and proofreading tools

Harper89.5#3 in best grammar and proofreading tools

Grammarly ranks higher in our list of grammar and proofreading tools (#1 against #3, score 92.5 against 89.5).

How we rank Share

92.5
Editorial score
89.5
4
Platforms
2
Yes
Free to use
Yes
No
Open source
Yes

Which should you choose?

Choose Grammarly if you want

Everyday grammar checks across browsers and apps.

Broadest reach: a browser extension, apps and a free plan that covers spelling and grammar. Tone and AI rewrites need Pro, and Harper keeps its checks on your device.

Choose Harper if you want

Private, free grammar checks on your own device.

Free, Apache-2.0 open source, with checks that run on your device. It covers grammar and spelling only, and its desktop app is listed for macOS.

The main differences

Only Harper runs on macOS.
Only Grammarly runs on iOS.
Only Grammarly runs on Android.
Only Grammarly runs on Web.
Harper is open source; Grammarly is not.

Side by side

	Grammarly	Harper
Score	92.5	89.5
Rank in list	#1 of 10	#3 of 10
Price	Free plan, paid upgradesFree plan; Pro $12 a month with a 7-day trial; Enterprise by sales contact	Free and open sourceFree and open source under Apache-2.0; no paid tier listed
Free to use	Yes	Yes
Open source	No	Yes
Platforms	WebBrowser extensioniOSAndroidWeb, Browser extension, iOS, Android	macOSBrowser extensionmacOS, Browser extension
Made by	Not stated	Not stated
Where checks run	Browser extension, apps and web editor	On your device, in browsers and editors
Rewrites and paraphrasing	AI rewrites need the Pro plan	None; no AI model in the loop
Style guidance	Tone suggestions	Grammar and spelling only
Best for	Everyday grammar checks across browsers and apps	Private, free grammar checks on your own device
Strengths	Free plan covers spelling and grammar checks Browser extension works in many web apps Tone suggestions show how text will read	Free and open source under Apache-2.0 Checks run on your device, with no telemetry Fast enough for live checks as you type
Limits	AI rewrites and agents need the paid Pro plan Enterprise pricing is not listed publicly	Desktop app is listed for macOS only No AI rewriting or tone suggestions
Links	Visit site	Visit site

Questions about Grammarly vs Harper

Is Grammarly better than Harper?: Grammarly ranks higher in our list of grammar and proofreading tools (#1 against #3, score 92.5 against 89.5). Grammarly is best for: everyday grammar checks across browsers and apps. Harper is best for: private, free grammar checks on your own device.
Which is cheaper, Grammarly or Harper?: Grammarly: Free plan; Pro $12 a month with a 7-day trial; Enterprise by sales contact. Harper: Free and open source under Apache-2.0; no paid tier listed.
Do Grammarly and Harper run on the same platforms?: Grammarly supports Web, Browser extension, iOS, Android. Harper supports macOS, Browser extension.