kitio.aiUndetectable AI vs StealthWriter
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Undetectable AI has the lower starting price: about $10 a month, against $20 for StealthWriter.
AI humanizer and detector that rewrites text to sound more natural
Freemium · $9.99/moAI text humanizer with a built-in detector and sentence-level rewrites
Freemium · $20/moAt a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- AI humanizer
- Multi-detector check
- Readability settings
- Paraphraser
- Chrome extension
- Three rewrite strengths
- AI detector V1 and V2
- Sentence-level Deep Scan
- Alternative sentence rewrites
- Fast processing
| Feature | Undetectable AI | StealthWriter |
|---|---|---|
| Best for | AI humanizer and detector that rewrites text to sound more natural | AI text humanizer with a built-in detector and sentence-level rewrites |
| Category | Writing | Writing |
| Pricing model | Freemium | Freemium |
| Starting price | $9.99/mo | $20/mo |
| Free plan | Yes | Yes |
| Made by | Undetectable AI | StealthWriter |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Undetectable AI has the lower starting price: about $10 a month, against $20 for StealthWriter.
Free plan
Cheapest paid plan
Top plan
Free trial
5 plans
10K words
$9.99/mo
- 10K words per month
- AI humanizer and detector
- Unlimited AI detecting
20K words
$19/mo
- 20K words per month
- All humanizer features
35K words
$31/mo
- 35K words per month
- All humanizer features
50K words
$42.50/mo
- 50K words per month
- All features from other plans
Business
Custom
- Non-expiring credits
- White labeling
- Priority support
6 plans
Free
Free
- 10 humanizations per day
- 10 AI scans per day
- 1,000 words per input
Starter
$20/mo
- 50 humanizations per day
- 50 AI scans per day
- 5,000 words per input
Plus
$50/mo
- 150 humanizations per day
- 150 AI scans per day
Pro
$100/mo
- 350 humanizations per day
- 350 AI scans per day
Business
$200/mo
- 800 humanizations per day
- 800 AI scans per day
Scale
$400/mo
- 2,000 humanizations per day
- 2,000 AI scans per day
- Dedicated support
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Undetectable AI
- Detector and humanizer in one place
- Readability controls
- Free detector checks
- Rewrites can lose nuance
- Using it to evade school rules breaks policies
StealthWriter
- Free plan with daily allowance
- Shows which sentences need work
- Pick between alternative rewrites
- Free input capped at 1,000 words
- Higher tiers get expensive quickly
- Detector scores are only estimates
Which one should you choose?
Choose Undetectable AI if you want:
- Detector and humanizer in one place
- Readability controls
- Free detector checks
Watch out: rewrites can lose nuance.
Choose StealthWriter if you want:
- Free plan with daily allowance
- Shows which sentences need work
- Pick between alternative rewrites
Watch out: free input capped at 1,000 words.
Undetectable AI vs StealthWriter FAQ
What is the difference between Undetectable AI and StealthWriter?
Undetectable AI: AI humanizer and detector that rewrites text to sound more natural. StealthWriter: AI text humanizer with a built-in detector and sentence-level rewrites. Both are writing tools.
Is Undetectable AI or StealthWriter cheaper?
Undetectable AI has the lower starting price: about $10 a month, against $20 for StealthWriter.
Do Undetectable AI and StealthWriter have free plans?
Undetectable AI: Yes. StealthWriter: Yes.
Who makes Undetectable AI?
Undetectable AI is made by Undetectable AI, based in United States.
Who makes StealthWriter?
StealthWriter is made by StealthWriter.
Which should I choose, Undetectable AI or StealthWriter?
Choose Undetectable AI if you value detector and humanizer in one place and readability controls. Choose StealthWriter if you value free plan with daily allowance and shows which sentences need work.