O
OAI content detection, plagiarism and fact checking for publishers and educators
Free, from $12.95/mo
GPTZero vs Paraphraser.io
Pricing, features, platforms and who each one suits — side by side.
G
Choose GPTZero if…
- you work on Chrome
- you're in its core audience: teachers and educators, students
P
Choose Paraphraser.io if…
- you're in its core audience: students, content writers
Side by side
Feature GPTZero Paraphraser.io
Pricing modelFreemiumFreemium
Starting price—$3.96/mo
Free plan
Free trial
API
Open source
Security and complianceSOC 2 Type II, CCPA, GDPR—
Plagiarism checker—
Writing replay—
Docs/LMS integration—
PlatformsWeb, Chrome, APIWeb, API
CategoryAI Detection & HumanizersParaphrasing & Rewriting
CompanyGPTZero LLC—
Based inUnited States—
Founded2023—
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 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.
GPTZero
FreeFree
Professional TeamPrice not shown on page
Paraphraser.io
FreeFree
Silver$4.55/week
Gold$9.55/month
Diamond$0.99/week, billed annually at $47.52
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
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
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Built from each vendor's public website; we haven't tested them hands-on. Editorial policy