ProWritingAid vs Sudowrite

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

ProWritingAid

Grammar checking, style reports and story critique for fiction writers

Free · from $10/moVisit site

Sudowrite

AI writing partner for novelists, from outline to drafted chapters and edits

From $10/moVisit site

Choose ProWritingAid if…

you want a free plan to start with
you work on Windows, macOS, Chrome
you're in its core audience: novelists, fiction writers

Choose Sudowrite if…

you want to trial it before paying
you're in its core audience: novelists, hobby fiction writers

Side by side

FeatureP

ProWritingAidS

Sudowrite

Pricing modelFreemiumFree trial

Starting price$10/mo$10/mo

Free plan

Free trial

API

Open source

Trains AI on your contentNo—

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

Security and complianceGDPR—

AI rewrites—

Tone adjustment—

Plagiarism checker—

Word/Google Docs add-in—

Custom style guide—

PlatformsWeb, Windows, macOS, ChromeWeb

CategoryGrammar & ProofreadingStory & Fiction Writing

CompanyOrpheus Technology Ltd · United Kingdom · since 2013Sudowrite

Full feature lists

P ProWritingAid

Grammar, spelling and punctuation checker
25+ writing analysis reports
Rephrase tool for rewriting sentences
Chapter Critique and Manuscript Analysis
Virtual Beta Reader and Marketability Analysis
Story Canvas and Plot Analysis for planning
Integrations with Word, Google Docs and Scrivener
Plagiarism checker

S Sudowrite

Story Bible: idea to outline, beats and drafted chapters
Write suggests next passages from characters, tone and plot
Describe, Expand and Rewrite tools for scene revision
Feedback on drafts plus developmental and line edits
Canvas for plot points, character arcs and references
1,000+ plugins, with option to build your own
Visualize generates art from character sheets
AI chat assistant tuned for novelists

Their home pages

What each vendor shows first: the pitch, the plans and the sign-up.

ProWritingAid home page — P ProWritingAid · prowritingaid.com

Sudowrite home page — S Sudowrite · sudowrite.com

What you'd pay

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

Work it out for your team

People

ProWritingAidPremium$10/mo
SudowriteHobby & Student$10/mo

The cheapest paid plan with a published price that fits. Custom and sales-quoted plans aren't included.

What the free plans include

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

Sudowrite

No free plan.

All plans and prices

ProWritingAid

Free$0

Premium$30/mo billed monthly, $10/mo billed yearly ($120), or $399 one-time

Premium Pro$36/mo billed monthly, $12/mo billed yearly ($144), or $699 one-time

Sudowrite

Hobby & Student$19/mo or $10/mo billed yearly

Professional$29/mo or $22/mo billed yearly

Max$59/mo or $44/mo billed yearly

Price changes we've recorded

We re-read each pricing page every month and log what changed.

ProWritingAid

Nov 5, 2026Starting price: none → $10/mo; Premium: USD price not shown → $30; Premium Pro: USD price not shown → $36
Nov 5, 2026Free: €0 → $0; Premium: €30/mo monthly, €10/mo billed yearly (€120), or €399 lifetime → USD price not shown; Premium Pro: €36/mo monthly, €12/mo billed yearly (€144), or €699 lifetime → USD price not shown

Sudowrite

No changes since we started tracking.