H
HReadability editor that flags wordy, unclear writing and offers AI fixes
From $8.33/mo
LanguageTool vs Paraphraser.io
Pricing, features, platforms and who each one suits — side by side.
L
Choose LanguageTool if…
- you want open source you can self-host or audit
- you work on Chrome, Windows, macOS
- you're in its core audience: students, professional writers
P
Choose Paraphraser.io if…
- you're in its core audience: students, content writers
Side by side
Feature LanguageTool Paraphraser.io
Pricing modelFreemiumFreemium
Starting price—$3.96/mo
Free plan
Free trial
API
Open source
Trains AI on your contentNo—
Security and complianceGDPR—
Tone adjustment—
Non-English checking—
Word/Google Docs add-in—
Browser extension—
Custom style guide—
PlatformsWeb, Chrome, Windows, macOS, iOS, APIWeb, API
CategoryGrammar & ProofreadingParaphrasing & Rewriting
Rank in its category#3 of 5—
CompanyLearneo, Inc.—
Based inUnited States—
Founded2003—
Part of——
What the free plans include
LanguageTool
Free plan limits aren't published.
Paraphraser.io
- Word limit shown as 0 / 400 words in the input box
- Word changer, fluency, standard, formal & smooth modes with 600 words limit
- Other modes (Creative, Smarter, Shorten, Academic, Expand) shown as premium-gated
- Pro raises the limit to 1500 words
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 Paraphraser.io
- 10+ paraphrasing modes, including Academic, Formal and Humanize
- Custom tone mode
- Click-to-swap synonym suggestions
- Frozen words to protect key terms
- Text extraction from images and screenshots
- Speech-to-text and recorded audio input
- File upload
- Support for 20+ languages
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
Paraphraser.io
FreeFree
Silver$4.55/week
Gold$9.55/month
Diamond$0.99/week, billed annually at $47.52
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
Paraphraser.io
- Free tier with five modes and no daily cap
- Supports more than 20 languages
- Accepts image, audio and file input
- Annual Diamond plan works out to about $3.96 per month
- API access only on the Diamond plan
- Advanced modes such as Creative and Academic require a paid plan
- Paid plans cap the total words and paraphrases
More comparisons
Other options to consider
HH
From $8.33/mo
H
Readability editor that flags wordy, unclear writing and offers AI fixes
Grammar & Proofreading
P
PP
Freemium
P
Grammar checking, line editing and story critique for fiction writers
Grammar & ProofreadingFree plan
G
GG
Freemium
G
AI writing assistant for grammar, tone, rewrites and AI-text detection
Grammar & ProofreadingFree plan
G
GG
Freemium
G
AI grammar, spelling and rephrasing help for English writers on any device
Grammar & ProofreadingFree planAPI
W
WW
Free, from $4.89/mo
W
AI rewriting, summarizing and grammar assistant for everyday writers
Paraphrasing & RewritingFree plan
S
SS
Free
S
Free online text rewriter plus grammar, spelling and summary tools
Paraphrasing & RewritingFree plan
Facts from each vendor's public pages, prices checked Oct 26, 2026. Editorial policy