Every score is worked out from the vendor's own pages · How we score →Disclosure
SAASINSPECTOR
Head-to-head · AI writing assistants · facts checked 26 Sept 2026

LanguageTool vs ProWritingAid

LanguageTool scores 5.5 to ProWritingAid's 4.5 among the AI writing assistants we rate, and is the better pick for 2 of the 4 kinds of buyer below.

LanguageTool
#4 of 7 AI writing assistants
5.5
/ 10
From
$4.99/mo (Premium, 2-year plan)
Free plan
Yes
ProWritingAid
#5 of 7 AI writing assistants
4.5
/ 10
From
$10.00/mo (Premium, billed yearly at $120/yr)
Free plan
Yes
The verdict

LanguageTool wins, 5.5 to 4.5

LanguageTool's Premium plan is $25.48 a month, cheaper than ProWritingAid Premium's $30. LanguageTool includes a team plan with a shared style guide, an API and a personal dictionary; ProWritingAid's pricing page lists none of those four. ProWritingAid checks for plagiarism through separate credits, which LanguageTool does not offer at all. Both tools say they do not train their AI on your writing.

Pick LanguageTool if you want a team plan, API and lower monthly price.

Pick ProWritingAid if you want plagiarism checking and don't need an API.

Best for

Who each one suits, decided on the criteria that matter to that buyer and the checked facts where the two differ.

Everyday writing at work
LanguageTool
LanguageTool 5.9 · ProWritingAid 5.0 on what it helps with and where it works
  • Writes in a saved voice or style: LanguageTool yes, ProWritingAid no
  • Phone keyboard that checks as you type: LanguageTool yes, ProWritingAid no
  • Word, Google Docs, Outlook, Gmail and Slack add-ins: Word, google_docs, outlook, gmail against Word, google_docs
  • But ProWritingAid leads on checks for plagiarism: ProWritingAid yes, LanguageTool no
Writers on a budget
Too close to call
LanguageTool 4.0 · ProWritingAid 4.0 on pricing
  • Monthly price, cheapest paid plan: LanguageTool $25.48, ProWritingAid $30
Teams with a house style
LanguageTool
LanguageTool 8.0 · ProWritingAid 4.0 on teams and control
  • Team plan with shared settings: LanguageTool yes, ProWritingAid no
  • API: LanguageTool yes, ProWritingAid no
Companies strict about privacy
Too close to call
LanguageTool 4.0 · ProWritingAid 4.0 on privacy and security
Section 01

How they score

Both are scored the same way, against the other AI writing assistants we rate, from facts on each vendor's own pages. LanguageTool leads on 2 of 5 criteria.

What it helps with30% of the score
LanguageTool3.5
ProWritingAid4.0
Pricing25% of the score
LanguageTool4.0
ProWritingAid4.0
Where it works20% of the score
LanguageTool9.5
ProWritingAid6.5
Teams and control15% of the score
LanguageTool8.0
ProWritingAid4.0
Privacy and security10% of the score
LanguageTool4.0
ProWritingAid4.0
How the score works →
Section 02

Where they differ

Every point where the two vendors' published facts disagree, with a link to where each fact was read. "Not published" means the vendor does not say either way.

Checks for plagiarism
ProWritingAid
LanguageTool
No
source ↗
ProWritingAid
Yes
source ↗
Writes in a saved voice or style
LanguageTool
LanguageTool
Yes
source ↗
ProWritingAid
No
source ↗
Word, Google Docs, Outlook, Gmail and Slack add-ins
LanguageTool
LanguageTool
Word, google_docs, outlook, gmail
source ↗
ProWritingAid
Word, google_docs
source ↗
Phone keyboard that checks as you type
LanguageTool
LanguageTool
Yes
source ↗
ProWritingAid
No
source ↗
Team plan with shared settings
LanguageTool
LanguageTool
Yes
source ↗
ProWritingAid
No
source ↗
API
LanguageTool
LanguageTool
Yes
source ↗
ProWritingAid
No
source ↗

Published by only one of them

Monthly price, cheapest paid plan
LanguageTool
$25.48
source ↗
ProWritingAid
$30
source ↗
Where they match (13)
Fixes spelling and grammar
LanguageTool
Yes
source ↗
ProWritingAid
Yes
source ↗
Writes new text from a prompt
LanguageTool
No
source ↗
ProWritingAid
No
source ↗
Builds citations
LanguageTool
No
source ↗
ProWritingAid
No
source ↗
Detects AI-written text
LanguageTool
No
source ↗
ProWritingAid
No
source ↗
Rewrites AI text to read as human
LanguageTool
No
source ↗
ProWritingAid
No
source ↗
Works as you type in other apps
LanguageTool
Yes
source ↗
ProWritingAid
Yes
source ↗
Browsers it has an extension for
LanguageTool
Chrome, edge, firefox
source ↗
ProWritingAid
Chrome, edge, firefox
source ↗
Your own style guide and terms
LanguageTool
Yes
source ↗
ProWritingAid
Yes
source ↗
Single sign-on
LanguageTool
No
source ↗
ProWritingAid
No
source ↗
Personal dictionary
LanguageTool
Yes
source ↗
ProWritingAid
Yes
source ↗
Does not train AI on your writing
LanguageTool
Yes
source ↗
ProWritingAid
Yes
source ↗
SOC 2
LanguageTool
No
source ↗
ProWritingAid
No
source ↗
ISO 27001
LanguageTool
No
source ↗
ProWritingAid
No
source ↗
Section 03

Pricing, plan by plan

Every plan each vendor publishes, monthly and yearly where both are offered.

LanguageTool

Free
Free
Grammar, spelling and punctuation checks, limited suggestions
Premium
$24.90/mo · $69.90/yr ($5.83/mo); $49.90 per quarter; $119.80 for 2 years ($4.99/mo)
Many more grammar, style and spelling corrections, more app integrations
Teams
$5.53/mo · $66.40/yr
All benefits for Premium, User management, Team Style Guide, Team Dictionary

ProWritingAid

Free
Free
500 words per check, 2 reports a day, 10 rephrases a day
Premium
$30/mo · $120/yr
Unlimited word count, Unlimited report runs, Unlimited Rephrases, 5 Sparks per day, Advanced style improvements, Custom style guide, Snippets, 25+ writing analysis reports, Customizable suggestions, Terminology management, Author comparison, Citations, Collaboration, Unlimited document storage,
Premium Pro
$36/mo · $144/yr
Everything in Premium, 50 Sparks per day, 3 Chapter Critiques per day, Up to 65% off Story Credits, Live workshops with top authors & editors, On-demand expert workshop library, Daily writing sprints (beta), Group critique sessions (beta), Writer networking events (beta), Guided writing challenges (beta)
Premium Lifetime
$399
Unlimited word count, Unlimited report runs, Unlimited Rephrases, 5 Sparks per day, Advanced style improvements, Custom style guide, Snippets, 25+ writing analysis reports, Customizable suggestions, Terminology management, Author comparison, Citations, Collaboration, Unlimited document storage,
Premium Pro Lifetime
$699
Everything in Premium, 50 Sparks per day, 3 Chapter Critiques per day, Up to 65% off Story Credits, Live workshops with top authors & editors, On-demand expert workshop library, Daily writing sprints (beta), Group critique sessions (beta), Writer networking events (beta), Guided writing challenges (beta)

For everything else about each tool, read the full LanguageTool review and ProWritingAid review.

Section 04

LanguageTool vs ProWritingAid: common questions

Which is better, LanguageTool or ProWritingAid?

LanguageTool scores 5.5 and ProWritingAid 4.5 out of 10 among the AI writing assistants we rate. LanguageTool is ahead on where it works and teams and control. ProWritingAid is ahead on what it helps with.

Is LanguageTool or ProWritingAid cheaper?

LanguageTool's cheapest paid plan is $4.99/mo (Premium, 2-year plan) and ProWritingAid's is $10.00/mo (Premium, billed yearly at $120/yr). Compare what each plan includes below before going on price alone.

What can LanguageTool do that ProWritingAid cannot?

On the facts both vendors publish: writes in a saved voice or style, phone keyboard that checks as you type, team plan with shared settings and aPI.

What can ProWritingAid do that LanguageTool cannot?

On the facts both vendors publish: checks for plagiarism.

Keep comparing