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StealthGPT vs Undetectable AI
Features, pricing, strengths and trade-offs — and which one fits your situation.
The verdict
Summary
StealthGPT is best for rewriting AI-generated drafts so they read less like machine text, while Undetectable AI is best for checking text against multiple AI detectors and rewriting flagged passages. Neither has a permanent free plan, but you can start with a free trial.
Which should you choose?
Choose StealthGPT if…
- You need rewriting AI-generated drafts so they read less like machine text
- You're one of: content writers editing ai-assisted drafts where ai use is permitted, marketers adjusting tone of ai copy
- Simple paste-and-rewrite workflow
Choose Undetectable AI if…
- You need checking text against multiple AI detectors and rewriting flagged passages
- You're one of: content marketers polishing ai-assisted drafts, writers checking how their text may be scored by detectors, agencies needing an api
- Detect, rewrite and re-check workflow in one place
At a glance
| StealthGPT | Undetectable AI | |
|---|---|---|
| Best for | Rewriting AI-generated drafts so they read less like machine text | Checking text against multiple AI detectors and rewriting flagged passages |
| Free plan | Check site | Trial only |
| Starting price | From $14.99/mo | From $5/mo |
| Learning curve | Low | Low |
| Platforms | Web, Chrome extension | Web, Chrome extension, API |
| Ideal for | Content writers editing AI-assisted drafts where AI use is permitted, Marketers adjusting tone of AI copy | Content marketers polishing AI-assisted drafts, Writers checking how their text may be scored by detectors, Agencies needing an API |
Feature comparison
| StealthGPT | Undetectable AI | |
|---|---|---|
| Answers with citations | Limited | No |
| Searches academic papers | No | No |
| Upload & chat with PDFs | — | — |
| AI content detection | Yes | Yes |
| Rewrites / humanizes text | Yes | Yes |
| Citation formatting | — | — |
| Browser extension | Yes | Yes |
| Writing editor | Limited | — |
IncludedLimited / higher plansNot available— Not confirmed
Security & enterprise
| StealthGPT | Undetectable AI | |
|---|---|---|
| Business / enterprise plan | No | Yes |
| SSO (SAML / OIDC) | — | — |
| SCIM user provisioning | — | — |
| SOC 2 | — | — |
| ISO 27001 | — | — |
| HIPAA (BAA available) | — | — |
| GDPR DPA | — | — |
| Data residency options | — | — |
| No training on your data | — | — |
| Audit logs | — | — |
| Admin controls | — | — |
| Deployment | — | Cloud |
From each vendor's security documentation. "—" = not confirmed. What to ask vendors · Compare all tools
What each tool does
StealthGPT
StealthGPT is an AI writing tool that combines a text generator with a 'humanizer' that rewrites AI text to lower AI-detector scores, plus a free AI detector. It is marketed mainly to students and content writers. Using it to submit AI-written work as your own can breach academic integrity and client policies.
Key features- AI humanizer that rewrites existing AI text
- Stealth Writer for generating essays and articles
- Built-in AI detector
- Adjustable rewrite tone and strength
- Chrome extension for rewriting in place (higher tiers)
Undetectable AI
Undetectable AI combines an AI detector that aggregates predictions from several third-party detectors with a humanizer that rewrites AI-generated text. It also offers a Chrome extension, an API and a set of writing tools. It is used by content writers and marketers, and is also marketed to students, where undisclosed AI use may breach academic rules.
Key features- AI detector showing likely results across several popular detectors
- Humanizer with modes such as Quality, Balanced and Creative
- Chrome extension that works in Gmail, Google Docs, LinkedIn and other sites
- Auto-typer tool for Google Docs
- API and Zapier integration
- Additional writing tools such as paraphraser and AI writer
Pricing
StealthGPT
Paid from ~$14.99/mo; ~30% off annual
Undetectable AI
Free trial (250 words); paid from $5/mo billed annually (10k words/mo)
Prices last checked September 2026. Plans change often — confirm on each vendor's site.
Pros and cons
StealthGPT
Strengths- Simple paste-and-rewrite workflow
- AI detector can be used without signing up
- Combines generation and rewriting in one tool
- Tone controls help match a target style
- No permanent free plan for the humanizer
- Independent tests show mixed results against current detectors
- Rewrites can introduce awkward phrasing or change meaning
- Using it to disguise AI work can violate school and employer policies, with serious consequences
Not ideal for: Students whose institutions prohibit undisclosed AI use should not use it for graded work; a research or citation tool is a better fit for legitimate study.
Undetectable AI
Strengths- Detect, rewrite and re-check workflow in one place
- Detector gives a view across multiple third-party checkers
- Extension works inside many common writing sites
- API available for businesses
- Free option is only a small trial
- Humanized output can read awkwardly and needs manual editing
- Auto-typer and humanizer features can be used to disguise AI work, which may breach academic integrity policies
- Detector results are estimates and can produce false positives
Not ideal for: Students should not use it to pass off AI-generated work as their own; it offers no research, source-finding or citation features.
Integrations
StealthGPT
Undetectable AI
FAQ
What is the main difference between StealthGPT and Undetectable AI?
StealthGPT is built for rewriting AI-generated drafts so they read less like machine text; Undetectable AI is built for checking text against multiple AI detectors and rewriting flagged passages.
Is StealthGPT or Undetectable AI cheaper?
StealthGPT starts from $14.99/mo and Undetectable AI starts from $5/mo (as of September 2026). On entry price, Undetectable AI is cheaper — but compare what each plan includes, since limits differ. Always confirm current pricing on each vendor's site.
Do StealthGPT and Undetectable AI have free plans?
Neither has a permanent free plan, but you can start with a free trial.
Which is easier to use, StealthGPT or Undetectable AI?
Both have a low learning curve.
What are good alternatives to StealthGPT and Undetectable AI?
Other research & study tools worth comparing include Perplexity, Consensus and Monica.
