Is Harper better than Antidote?

Harper ranks higher in our list of grammar and proofreading tools (#3 against #6, score 89.5 against 85.5). Antidote is best for: French and English writers who want a deep corrector. Harper is best for: private, free grammar checks on your own device.

Which is cheaper, Antidote or Harper?

Antidote: Yearly subscription per user; one-language or both-language plans. Harper: Free and open source under Apache-2.0; no paid tier listed.

Do Antidote and Harper run on the same platforms?

Antidote supports Windows, macOS, Web, iOS, iPadOS. Harper supports macOS, Browser extension.

Comparison · Grammar and proofreading tools

Antidote vs Harper: which is better in 2026?

Antidote85.5#6 in best grammar and proofreading tools

Harper89.5#3 in best grammar and proofreading tools

Harper ranks higher in our list of grammar and proofreading tools (#3 against #6, score 89.5 against 85.5).

How we rank Share

85.5
Editorial score
89.5
5
Platforms
2
No
Free to use
Yes
No
Open source
Yes

Which should you choose?

Choose Antidote if you want

French and English writers who want a deep corrector.

The strongest suite here for French and English, with detailed guides and dictionaries. It is a yearly subscription per user and runs as a desktop or web app, so it is heavier than browser tools.

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 Antidote runs on Windows.
Only Antidote runs on iOS.
Only Antidote runs on Web.
Harper is open source; Antidote is not.
Harper can be used for free; Antidote requires payment.

Side by side

	Antidote	Harper
Score	85.5	89.5
Rank in list	#6 of 10	#3 of 10
Price	SubscriptionYearly subscription per user; one-language or both-language plans	Free and open sourceFree and open source under Apache-2.0; no paid tier listed
Free to use	No	Yes
Open source	No	Yes
Platforms	WindowsmacOSWebiOS, iPadOSWindows, macOS, Web, iOS, iPadOS	macOSBrowser extensionmacOS, Browser extension
Made by	Not stated	Not stated
Where checks run	Windows and Mac apps, plus web	On your device, in browsers and editors
Rewrites and paraphrasing	Suggestions for reworking sentences	None; no AI model in the loop
Style guidance	Style suggestions and language guides	Grammar and spelling only
Best for	French and English writers who want a deep corrector	Private, free grammar checks on your own device
Strengths	Corrects French and English in one suite Desktop, web and iPhone or iPad apps Large dictionaries and detailed language guides	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	Sold only as a yearly subscription per user Mobile app is limited to iPhone and iPad	Desktop app is listed for macOS only No AI rewriting or tone suggestions
Links	Visit site	Visit site

Questions about Antidote vs Harper

Is Harper better than Antidote?: Harper ranks higher in our list of grammar and proofreading tools (#3 against #6, score 89.5 against 85.5). Antidote is best for: French and English writers who want a deep corrector. Harper is best for: private, free grammar checks on your own device.
Which is cheaper, Antidote or Harper?: Antidote: Yearly subscription per user; one-language or both-language plans. Harper: Free and open source under Apache-2.0; no paid tier listed.
Do Antidote and Harper run on the same platforms?: Antidote supports Windows, macOS, Web, iOS, iPadOS. Harper supports macOS, Browser extension.