O
OAI content detection, plagiarism and fact checking for publishers and educators
Free, from $12.95/mo
GPTZero vs StealthGPT
Pricing, features, platforms and who each one suits — side by side.
G
Choose GPTZero if…
- you want a free plan to start with
- you're in its core audience: teachers and educators, students
S
Choose StealthGPT if…
- you want to trial it before paying
- you work on iOS
- you're in its core audience: students, content writers
Side by side
Feature GPTZero StealthGPT
Pricing modelFreemiumFree trial
Starting price—$29.99/mo
Free plan
Free trial
API
Open source
Security and complianceSOC 2 Type II, CCPA, GDPR—
Sentence-level highlights—
Plagiarism checker—
Writing replay—
Bulk processing—
Shareable reports—
Docs/LMS integration—
PlatformsWeb, Chrome, APIWeb, iOS, Chrome, API
CategoryAI DetectorsAI Humanizers
CompanyGPTZero LLC · United States · since 2023XYZ AI, Inc.
Full feature lists
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
S StealthGPT
- AI Humanizer with Lite and Super rewrite modes
- AI Detector with instant AI-likelihood score
- Stealth Writer essay generator with citations
- Stealth Agent for research, drafting and fact-checking
- Chat with PDF and photo-to-answers
- AI watermark detectors and removers
- REST API with bulk requests of up to 100 items
- WordPress, Zapier, n8n and MCP integrations
Their home pages
What each vendor shows first: the pitch, the plans and the sign-up.
GPTZero · gptzero.me
StealthGPT · stealthgpt.aiWhat you'd pay
The cheapest plan that fits, per month, billed yearly where the plan offers it.
What the free plans include
GPTZero
- 0 / 10,000 characters per scan in the AI detector box
StealthGPT
No free plan.
All plans and prices
GPTZero
FreeFree
Professional TeamPrice not shown on page
StealthGPT
Pro$29.99/mo ($1 for 3-day trial)
Max$49.99/mo ($1 for 3-day trial)
Enterprise$179.99/mo
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
StealthGPT
- Pro and Max can be tried for $1 for 3 days
- API, MCP, Zapier and n8n integrations available
- Available on web, iOS and as a Chrome extension
- Interface available in nine languages
- Pro plan limits each request to 1,000 words
- Team seats only on Max and Enterprise
- Trial converts to $29.99/month or more
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Rewrites AI-generated text to read as human, with a built-in AI detector
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W
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Facts from each vendor's public pages, prices checked Nov 5, 2026. Editorial policy