H
HReadability editor that flags wordy, unclear writing and offers AI fixes
From $8.33/mo
LanguageTool vs ProWritingAid
Pricing, features, platforms and who each one suits — side by side.
L
Choose LanguageTool if…
- you need an API to build on
- you want open source you can self-host or audit
- you work on iOS
- you're in its core audience: students, professional writers
P
Choose ProWritingAid if…
- you're in its core audience: novelists and fiction writers, self-published authors
Side by side
Feature LanguageTool ProWritingAid
Pricing modelFreemiumFreemium
Starting price——
Free plan
Free trial
API
Open source
Trains AI on your contentNoNo
Data retention—Analysed text deleted after checking; only explicitly saved documents are kept
Security and complianceGDPRGDPR
AI rewrites—
Tone adjustment
Plagiarism checker—
Non-English checking—
Word/Google Docs add-in
Browser extension—
Custom style guide
PlatformsWeb, Chrome, Windows, macOS, iOS, APIWeb, macOS, Windows, Chrome
CategoryGrammar & ProofreadingGrammar & Proofreading
CompanyLearneo, Inc.Orpheus Technology Ltd
Based inUnited StatesUnited Kingdom
Founded20032013
Part of——
Key features
L LanguageTool
- Grammar, spelling, punctuation and style checking
- AI sentence paraphrasing in several tones
- Support for 30+ languages and dialects
- Browser add-ons for Chrome, Edge, Firefox, Opera, Safari
- Plugins for Google Docs, Word, Pages, LibreOffice
- Personal dictionary and Picky Mode
- Team style guides and shared dictionaries
- Proofreading API with daily call-limit plans
P ProWritingAid
- Grammar, spelling and punctuation checker
- 25+ writing analysis reports
- Rephrase tool for rewriting sentences
- Chapter Critique and full manuscript analysis
- Story Canvas and Outline Crafter for planning
- Comparison of your writing style with 90 fiction authors
- Integrations with Word, Google Docs, Scrivener and browsers
- Custom style guide and dictionary
Plans and prices
From each vendor's site. Prices change — confirm before buying.
LanguageTool
BasicFree
PremiumPrice not shown on page
TeamsPrice not shown on page
BusinessCustom
ProWritingAid
Free€0
Premium€30/mo monthly, €10/mo billed yearly (€120), or €399 lifetime
Premium Pro€36/mo monthly, €12/mo billed yearly (€144), or €699 lifetime
Strengths and limitations
LanguageTool
- Free Basic plan is available
- Supports 30+ languages and dialects
- Many integrations, including browsers, office suites and email clients
- Source code is published on GitHub
- Free plan is limited to 2,000 characters per text field
- Free plan allows only 3 AI rephrasings per day
- Prices did not display on the pricing pages
- Outlook add-on is still in beta
ProWritingAid
- Free plan with grammar checks and daily Rephrases
- Lifetime purchase option on paid plans
- Works in Word, Google Docs, Scrivener and major browsers
- Discount available for students
- Free plan analyzes only 500 words at a time
- Supports English only
- Monthly plans are not refundable, and the money-back guarantee on other plans lasts only 3 days
- In-depth manuscript analysis needs separately purchased Story Credits
More comparisons
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From $8.33/mo
H
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GG
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GG
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AI grammar, spelling and rephrasing help for English writers on any device
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W
WW
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W
AI rewriting, summarizing and grammar assistant for everyday writers
Paraphrasing & RewritingFree plan
S
SS
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S
Free online text rewriter plus grammar, spelling and summary tools
Paraphrasing & RewritingFree plan
P
POnline AI paraphrasing tool with multiple rewriting modes in 20+ languages
Free, from $3.96/mo
P
Free, from $3.96/mo
P
Online AI paraphrasing tool with multiple rewriting modes in 20+ languages
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Built from each vendor's public website; we haven't tested them hands-on. Editorial policy