The comparison
You want one Google-sign-in workspace with paid inputs up to 12,000 words, plus separate tone, length, reading-level, rewrite-strength, exact-term, and source-comparison controls.
Paste your text and compare the changes.
Checking your account and recovering the draft…
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UltraHumanizer provides editing controls and paid capacity for complete documents, with a short free allowance. Stealthly offers a simpler detector-led workflow with Light, Balanced, and Deep modes; its advertised free limit is 80 words per request and 300 words per month. Treat bypass and originality statements as vendor claims.
This page is published by UltraHumanizer. Product descriptions are based on public information; they are not an independent performance benchmark. Explore our API or browser extension.
The 30-second answer
It keeps the workflow focused on readable, natural output while protecting the central meaning of your draft.
Try it free ↗Compare the capabilities that matter to your workflow. Pricing and included features may change, so confirm the current terms before paying.
Compare the features ↓Feature-by-feature
Public product information reviewed through September 16, 2026. We separate vendor claims from independently verified outcomes.
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| Feature |  UltraHumanizer | Stealthly |
|---|---|---|
| Free starting access | Free plan; paid plans from $8/month | 300 words per month with an 80-word limit per request |
| Document size | 500 words on Free; 1,000 to 12,000 on paid plans | 80 words free, 400 Basic, 1,000 Pro, or 2,000 Premium per request |
| Rewrite controls | Tone, output length, reading level, rewrite strength, and exact terms | Light, Balanced, and Deep processing modes |
| Revision workflow | Editable result, quick refinements, and visible source-versus-result changes | Paste, check, choose a mode, humanize, and review the returned text |
| Detection workflow | Separate AI text, image, and voice detector tools | AI-content detection is included in the product and plan descriptions |
| Evidence standard | Editorial controls and source comparison are visible in the current tool | Large user, training, pass-rate, detector-bypass, and originality statements are published as company claims |
| Privacy clarity | Uploads are processed for the requested result; sensitive details should still be removed | Policy describes account, device, usage, location, cookie, payment, analytics, advertising, and security processing; no text-specific retention period is stated |
| Paid pricing | Free plan; paid plans from $8/month | Reviewed monthly list prices were $17 Basic, $30 Pro, and $49 Premium; promotional and annual figures may differ |
| Refund and renewal | Free plan needs no card; paid subscriptions auto-renew until canceled | Auto-renewing subscriptions; first-purchase refund requests require three days and fewer than 1,000 words used |
| Best fit | Long-form, editing-first work with direct source review | Short passages where simple rewrite depth and an integrated estimate matter most |
Based on public product information available when this comparison was written. Features and prices can change; check current terms before choosing a plan. Vendor performance claims are not independent guarantees.
How we compare
What can a new user do before creating an account or paying?
We compare input limits, controls, revision steps, and setup friction.
Detection, history, API access, and analysis matter for some workflows.
Official pages support feature facts; vendor performance claims are not treated as independent tests.
Decision scenarios
Disclosure: These are illustrative workflow scenarios, not customer testimonials or performance test results.
Needs one coherent workspace, exact-term protection, and visible source-versus-result changes across thousands of words.
Works in small sections and wants a quick Light, Balanced, or Deep choice beside an AI-content estimate.
Must preserve provenance, follow disclosure rules, and treat every detector score as uncertain rather than proof.
FAQs
UltraHumanizer offers paid long-document capacity, direct editorial controls, exact-term protection, and visible change review. Stealthly may suit short passages when three simple rewrite-depth choices and an integrated AI estimate fit the workflow.
Yes. Stealthly’s official pricing page currently lists a free plan with 300 words per month and up to 80 words per request. Product limits can change, so confirm the live editor.
The reviewed monthly pricing page lists Basic at $17 for 20,000 words, Pro at $30 for 50,000 words, and Premium at $49 for 300,000 words. Annual or promotional figures may be lower; verify the billing toggle and checkout total.
No. Stealthly is the product at stealthly.ai with Light, Balanced, and Deep modes. StealthWriter is a separate product at stealthwriter.ai with different models, limits, intensity controls, and revision features.
No independent comparison should guarantee how every current or future detector will classify a passage. Treat Stealthly’s performance statements as vendor claims and review facts, citations, voice, originality, and applicable disclosure rules yourself.
Your own draft is the most useful test
