S
SUndetectable AI vs WordAi
Pricing, features, platforms and who each one suits — side by side.
U
Choose Undetectable AI if…
- you want a free plan to start with
- you want the lower entry price ($5/mo vs $9/mo)
- you work on Chrome
- you're in its core audience: students, content writers and marketers
W
Choose WordAi if…
- you're in its core audience: seo publishers, content marketers
Side by side
Feature Undetectable AI WordAi
Pricing modelFreemiumFree trial
Starting price$5/mo$9/mo
Free plan
Free trial
API
Open source
PlatformsWeb, Chrome, APIWeb, API
CategoryAI HumanizersParaphrasing & Rewriting
CompanyUndetectable Inc.Cardinell Enterprises LLC dba Cortx · USA
Full feature lists
U Undetectable AI
- Sentence-level AI content detection
- AI humanizer that rewrites text to read naturally
- Paraphrasing tool and AI essay writer
- AI plagiarism checker and text watermark remover
- Image, audio, video and deepfake detectors
- Fake PDF, receipt and ID detectors
- Chrome extension for Google Docs and Gmail
- Supports 50+ languages
W WordAi
- Sentence restructuring and splitting
- Adjustable creativity level
- Up to 1,000 rewrites per article
- Bulk rewriting and bulk export, including spintax
- HTML support and code view
- Spelling and grammar fixes
- Article Forge integration for importing articles
- API for adding rewriting to workflows
Their home pages
What each vendor shows first: the pitch, the plans and the sign-up.
Undetectable AI · undetectable.ai
WordAi · wordai.comWhat you'd pay
The cheapest plan that fits, per month, billed yearly where the plan offers it.
Work it out for your team
- Undetectable AI10K words$5/mo
- WordAiStarter$9/mo
The cheapest paid plan with a published price that fits. Custom and sales-quoted plans aren't included.
All plans and prices
Undetectable AI
10K words$9.99/mo, or $5.00/mo billed yearly ($60)
20K words$19.00/mo, or $9.50/mo billed yearly ($114)
35K words$31.00/mo, or $15.75/mo billed yearly ($189)
50K words$42.50/mo, or $21.25/mo billed yearly
BusinessCustom
WordAi
Starter$17/mo or $9/mo billed annually
Power$57/mo or $27/mo billed annually
EnterpriseCustom
Price changes we've recorded
We re-read each pricing page every month and log what changed.
Undetectable AI
- Nov 8, 2026Pricing model: Free trial → Freemium; 10K words: $5 → $9.99; 20K words: $9.50 → $19; 35K words: $15.75 → $31; 50K words: $21.25 → $42.50
WordAi
No changes since we started tracking.
Strengths and limitations
Undetectable AI
- Detection and humanizing in one tool
- Unlimited AI detecting on all individual plans
- Yearly billing roughly halves the monthly price
- Chrome extension works in Google Docs and Gmail
- Free trial is limited to 250 words
- Accuracy is highest in English
- Humanizing is capped by the plan's monthly word limit
WordAi
- Annual billing cuts the price to $9/mo for Starter
- 3-day free trial plus a 30-day money-back guarantee
- API access on the Starter and Power plans
- Power plan includes 3,000,000 rewrite words a month
- No free plan, only a time-limited trial
- Refund applies only if you have rewritten fewer than 10 articles
- No desktop or mobile apps listed
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Facts from each vendor's public pages, prices checked Oct 26, 2026. Editorial policy