Paraphraser.io vs ProWritingAid

Pricing, features, platforms and who each one suits — side by side.

Paraphraser.io

Online AI paraphrasing tool with multiple rewriting modes in 20+ languages

Free · from $3.96/moVisit site

ProWritingAid

Grammar checking, line editing and story critique for fiction writers

FreemiumVisit site

Choose Paraphraser.io if…

you need an API to build on
you're in its core audience: students, content writers

Choose ProWritingAid if…

you work on macOS, Windows, Chrome
you're in its core audience: novelists and fiction writers, self-published authors

Side by side

FeatureP

Paraphraser.ioP

ProWritingAid

Pricing modelFreemiumFreemium

Starting price$3.96/mo—

Free plan

Free trial

API

Open source

Trains AI on your content—No

Data retention—Analysed text deleted after checking; only explicitly saved documents are kept

Security and compliance—GDPR

Tone/style modes—

Humanize AI text—

Summarizer—

Frozen words—

Non-English languages—

File import/export—

PlatformsWeb, APIWeb, macOS, Windows, Chrome

CategoryParaphrasing & RewritingGrammar & Proofreading

Rank in its category—#4 of 5

Company—Orpheus Technology Ltd

Based in—United Kingdom

Founded—2013

Part of——

What you'd pay

The cheapest plan that fits, per month, billed yearly where the plan offers it.

Team size	Paraphraser.io	ProWritingAid
1 person	$3.96 Diamond	no published plan
5 people	$3.96 Diamond	no published plan
20 people	$3.96 Diamond	no published plan

What the free plans include

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

ProWritingAid

Each line editing report can be run 2 times per day on 500 words of text
10 Rephrases per day
3 Sparks per day
3 Creative Nudges per day

Key features

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

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.

Paraphraser.io

FreeFree

Silver$4.55/week

Gold$9.55/month

Diamond$0.99/week, billed annually at $47.52

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

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

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