O
OAI content detection, plagiarism and fact checking for publishers and educators
Free, from $12.95/mo
GPTZero vs ProWritingAid
Pricing, features, platforms and who each one suits — side by side.
G
Choose GPTZero if…
- you need an API to build on
- you're in its core audience: teachers and educators, students
P
Choose ProWritingAid if…
- you work on macOS, Windows
- you're in its core audience: novelists and fiction writers, self-published authors
Side by side
Feature GPTZero ProWritingAid
Pricing modelFreemiumFreemium
Starting price——
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 complianceSOC 2 Type II, CCPA, GDPRGDPR
Plagiarism checker—
Writing replay—
Docs/LMS integration—
PlatformsWeb, Chrome, APIWeb, macOS, Windows, Chrome
CategoryAI Detection & HumanizersGrammar & Proofreading
CompanyGPTZero LLCOrpheus Technology Ltd
Based inUnited StatesUnited Kingdom
Founded20232013
Part of——
Key features
G GPTZero
- Detects text from ChatGPT, Claude and Gemini
- Highlights passages likely to be AI-generated
- Writing Replay shows how a document was typed
- Plagiarism checker for unattributed content
- Hallucination detector
- Grammar check and writing feedback
- Google Docs, Google Classroom, Canvas and Zapier integrations
- API with code samples in 17 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.
GPTZero
FreeFree
Professional TeamPrice not shown on page
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
GPTZero
- Free tier available to get started
- Integrates with Google Docs, Google Classroom, Canvas and Zapier
- Fully supports five languages
- States SOC 2 Type II, FERPA, GDPR and CCPA compliance
- Individual plan prices could not be read from the pricing page
- Team plan requires at least 2 seats and payment by card only
- No native mobile apps mentioned
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
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Built from each vendor's public website; we haven't tested them hands-on. Editorial policy