StealthGPT: AI Paraphrasing Tool with Ninja and Ghost Modes for Academic and SEO Use (2026)

StealthGPT is a web-based AI humanizer and AI paraphrasing tool that rewrites AI-generated text using two core models: Ninja Mode for quick general rewrites and Ghost Mode for deep restructuring of academic and high-stakes content. The free plan gives 350 words per week using Ninja Mode — no credit card required. Paid plans start at $14.99/month for 100,000 words with full Ghost Mode access, scaling to enterprise custom pricing for unlimited words and API access. StealthGPT adds academic formatting tools (APA, MLA, Chicago citations), a built-in Stealth Score (1–100), and a Chrome extension. It supports 50+ languages. StealthGPT suits students writing essays, marketers avoiding SEO penalties, and professionals who need academically formatted output. It is not the right tool for users who need a simple one-click interface or guaranteed bypass of Originality.AI without manual editing.

What StealthGPT Does Well

• Ghost Mode for academic writing: Ghost Mode performs deep sentence restructuring beyond simple synonym swapping — it reorganizes paragraph flow, adds citation placeholders, and supports APA, MLA, and Chicago formatting. This makes it meaningfully different from tools that only do surface-level rewording.
• Stealth Score metric: StealthGPT rates every output on a 1–100 scale ("how human does this text sound?"), giving users a quick signal of detection risk before publishing. Most competitors don't offer this kind of output scoring.
• Chrome extension with ChatGPT integration: The "Stealthify" Chrome extension lets users humanize ChatGPT responses directly in the browser without copy-pasting. This cuts friction for users who generate content in ChatGPT and want to humanize it immediately.
• Generous free tier relative to competitors: 350 words per week (roughly 1,400 words/month) with no credit card required outperforms Humbot (600/month), BypassGPT (150/month), and WriteHuman (3 requests/month) for free access.
• 50+ language support: Verified via third-party sources, covering Spanish, Mandarin, Arabic, and other major languages alongside English.

Known Limitations

• Ghost Mode requires paid plan: The free tier only includes Ninja Mode. Users who need Ghost Mode — which is StealthGPT's primary academic differentiator — must pay from the first month. Testing the tool's strongest feature is not possible for free.
• Inconsistent results against strict detectors: Community testing on Reddit and review sites reports Ghost Mode achieving 70–90% success against mid-tier detectors like Copyleaks, but only 50–70% against strict detectors like Originality.AI. For users specifically targeting Originality.AI, manual editing is necessary.
• Occasional gibberish output: Multiple reviewers note that StealthGPT occasionally produces restructured sentences that don't make grammatical sense, particularly in Ghost Mode on complex inputs. Output requires human review before submission.
• Academic bypass claims not universally proven: While StealthGPT specifically targets academic use, Reddit discussion shows mixed student experiences — some reporting success with essays, others seeing continued flags on Turnitin.

Best For

• Students writing essays and research papers who need academic formatting (citations) and deep restructuring to pass institutional AI detectors.
• Content creators and bloggers who want to humanize ChatGPT output directly in-browser via the Chrome extension.
• Marketers producing SEO content who need output that avoids Google AI penalties.
• Users who need 350 free words per week without entering a credit card.

Who Should Look Elsewhere

• Users who need guaranteed Originality.AI bypass — StealthGPT's success rate against this detector is inconsistent even on paid plans.
• Users who want a simple single-mode interface without model selection — Ninja/Ghost choice adds configuration overhead.
• Teams who need dedicated multilingual humanization quality verification — 50+ language support is claimed but not independently audited per language.

Rewriting Modes Explained

StealthGPT uses two named models rather than traditional paraphrasing modes:

• Ninja Mode (free + paid): Applies light edits — vocabulary swaps, minor sentence restructuring, phrasing variation. Best for casual content: blogs, social media posts, marketing emails. Fast and low-risk in terms of meaning alteration. Available on the free plan with 350 words/week.
• Ghost Mode (paid only — Pro and above): Performs deep paragraph restructuring, reorganizes sentence order, introduces deliberate style variation, and supports academic citation formatting. Targets high-stakes content like student essays, research papers, and professional reports. Success rates of 70–90% against mid-tier detectors; mixed against Originality.AI.

Pricing and Cost at Scale

Free plan: $0. 350 words/week (~1,400 words/month). Ninja Mode only. No credit card required. Suitable for testing and light casual use.

Pro: $14.99/month. 100,000 words/month. Full Ghost Mode access. SEO tools. Priority support. Includes Chrome extension.

Enterprise: Custom pricing. Unlimited words. API access. Priority processing. Custom support.

API (Starter): $100 for 500,000 prepaid words (pay-as-you-go model). Suitable for developers building humanization into applications.

Note: Pricing verified as of July 2025 via aitoolsforest.com. Confirm current prices at stealthgpt.ai/pricing before committing.

Getting Started

1. Visit stealthgpt.ai and create a free account — no credit card required.
2. Paste up to 350 words of AI-generated text into the input panel (free tier, Ninja Mode only).
3. Select Ninja Mode for general content, or upgrade to Pro for Ghost Mode on academic writing.
4. Review the Stealth Score (1–100) in the output panel — aim for 80+ before publishing.
5. Install the Chrome extension ("Stealthify") to humanize ChatGPT responses directly in your browser without switching tabs.

What Users Are Saying

On r/PromptEngineering, a 2025 review described mixed results, with some users recommending skipping StealthGPT in favor of alternatives. On r/WeReviewedIt, a detailed test found the tool effective at reducing AI detection scores on general content. The dedicated subreddit r/stealthgpt includes community discussion and comparison testing against other bypass tools. Overall sentiment: works for many use cases but requires manual editing for academic high-stakes submissions.

Frequently Asked Questions

Is StealthGPT free?

Yes, with limits. The free plan gives 350 words per week using Ninja Mode. No credit card is required. Ghost Mode requires a paid plan starting at $14.99/month.

Does StealthGPT require signup?

Yes — an account is required. However, the free plan doesn't require a credit card, making signup low-commitment.

Does StealthGPT bypass AI detectors?

Yes, in many cases. Ghost Mode achieves 70–90% success against mid-tier detectors and academic use. Results against Originality.AI are inconsistent (50–70%), and manual editing is recommended for high-stakes submissions.

What languages does StealthGPT support?

50+ languages including Spanish, Mandarin, Arabic, French, and German alongside English.

What is the word limit on the free plan?

350 words per week, using Ninja Mode only. This is among the more generous free tiers in the AI humanizer category.

Does StealthGPT have a Chrome extension?

Yes. The "Stealthify" extension integrates with ChatGPT, allowing in-browser humanization without copy-pasting.

Sources

• stealthgpt.ai — Official website
• StealthGPT API pricing documentation
• AIToolsForest — StealthGPT pricing and features (July 2025)
• Reddit r/PromptEngineering — StealthGPT review 2025
• Reddit r/WeReviewedIt — StealthGPT humanizer test
• Reddit r/stealthgpt — Community discussion