Side by side

ProWritingAid vs WritingTool

Both stand on grammar checkers. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

ProWritingAid

Free plan Extension

ProWritingAid combines writing suggestions with reports, integrations, and plagiarism checking. Check the free limits and refund terms against your writing needs before choosing a plan.

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Choose WritingTool if you work with extensive texts in LibreOffice and want configurable LanguageTool proofreading, with optional AI functions. Look elsewhere if you need OpenOffice support from version 26.1, or if the Java and LibreOffice requirements do not suit your setup.

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The facts

	ProWritingAid	WritingTool
Free plan	Yes	Yes
Open source	Not published	Not published
Runs on	Extension	Linux, Mac, Windows
Lowest paid plan	Premium: $120 a year	Free or on request
Plans published	13	1
Maker	ProWritingAid	Not published
Website	prowritingaid.com	writingtool.org
On grammar checkers	#32 of 88	#28 of 88

ProWritingAid: what it does well

Works with Word, Google Docs, and Scrivener
Free plan includes daily editing and rephrasing tools
Paid plans support documents of any length
Premium includes sharing and real-time comments
Text is not stored on processing servers

What to know first

Supports English only
Free suggestions cover 500 words at a time
Monthly plans are not refundable

WritingTool: what it does well

Checks spelling, grammar and style using LanguageTool.
Applies rules across paragraph boundaries.
Caches results for repeat checks on long texts.
Supports profiles for different document types.
Runs locally without requiring a remote server.

What to know first

Requires Java 17 or higher.
From version 26.7, it requires LibreOffice 24.2 or higher.
Image and text-to-speech APIs currently support localAI only.
Extensive AI stylistic changes are experimental and not recommended.

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