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StealthGPT vs Undetectable AI
Pricing, features, platforms and who each one suits — side by side.
S
Choose StealthGPT if…
- you're in its core audience: students, content writers and bloggers
U
Choose Undetectable AI if…
- you want a free plan to start with
- you're in its core audience: students and educators, content writers and bloggers
Side by side
Feature StealthGPT Undetectable AI
Pricing modelPaidFreemium
Starting price—$5/mo
Free plan
Free trial
API
Open source
PlatformsWeb, Chrome, APIWeb, Chrome, API
Company—Undetectable Inc.
Full feature lists
S StealthGPT
- AI humanizer with Lite and Super rewrite modes
- Free AI detector with instant 0-100 score
- Removes Claude, ChatGPT and Gemini SynthID text watermarks
- Stealth Writer for essays with in-text citations
- Stealth Agent for research, drafting and fact-checking
- Chrome extension with human-like auto-typing
- API, MCP server, Zapier, n8n and WordPress integrations
- Enterprise humanization of up to 20,000 words per run
U Undetectable AI
- Sentence-level AI text detection
- AI humanizer that rewrites structure, vocabulary and tone
- AI image, audio and video detection
- Fake PDF, receipt and ID detectors
- Paraphrasing tool and AI essay writer
- Human auto typer
- Chrome extension for Google Docs and Gmail
- Support for 50+ languages
What you'd pay
The cheapest plan that fits, per month, billed yearly where the plan offers it.
StealthGPT
Paid. Plan details aren't published.
Undetectable AI
10K words$5.00/mo billed yearly ($60/yr); $9.99/mo monthly
20K words$9.50/mo billed yearly ($114/yr); $19.00/mo monthly
35K words$15.75/mo billed yearly ($189/yr); $31.00/mo monthly
50K words$21.25/mo billed yearly; $42.50/mo monthly
BusinessCustom
Strengths and limitations
StealthGPT
- AI detector works without signup
- Integrations with Zapier, n8n, WordPress and MCP clients
- Pro plans and above can add team members at no extra cost
- Interface in nine languages
- Non-enterprise plans were limited to 3,000 words per humanization
- Some tools, like in-text citations, are limited to higher tiers
- No mobile app listed
Undetectable AI
- Annual plans start at $5/mo for 10K words
- Unlimited AI detection on paid plans
- Money-back guarantee if humanized output is flagged
- Chrome extension works in Google Docs and Gmail
- Free trial is limited to 250 words
- Accuracy is highest in English
- Monthly billing costs about twice the annual rate
More comparisons
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Facts from each vendor's public pages, prices checked Nov 8, 2026. Editorial policy