G
GCopyleaks AI Detector vs Undetectable AI
Pricing, features, platforms and who each one suits — side by side.
VS
C
Choose Copyleaks AI Detector if…
- you're in its core audience: educators, students
U
Choose Undetectable AI if…
- you want the lower entry price ($5/mo vs $13.99/mo)
- you work on Chrome
- you're in its core audience: students, content writers and marketers
Side by side
Feature Copyleaks AI Detector Undetectable AI
Pricing modelFreemiumFreemium
Starting price$13.99/mo$5/mo
Free plan
Free trial
API
Open source
PlatformsWeb, APIWeb, Chrome, API
CategoryAI DetectorsAI Humanizers
CompanyCopyleaksUndetectable Inc.
Full feature lists
C
- Detects AI-generated text from ChatGPT, Gemini and others
- Plagiarism detection for text
- AI image detection
- Credit system: one credit covers 250 words or one image
- One-time extra credit purchases
- API access on enterprise plans
- LMS integration for education
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
Their home pages
What each vendor shows first: the pitch, the plans and the sign-up.
Copyleaks AI Detector · copyleaks.com
Undetectable AI · undetectable.aiWhat you'd pay
The cheapest plan that fits, per month, billed yearly where the plan offers it.
| Team size | Copyleaks AI Detector | Undetectable AI |
|---|---|---|
| 1 person | $13.99 Personal | $5 10K words |
| 5 people | no published plan | $5 10K words |
| 20 people | no published plan | $5 10K words |
Work it out for your team
- Undetectable AI10K words$5/mo
- Copyleaks AI DetectorPersonal$13.99/mo
The cheapest paid plan with a published price that fits. Custom and sales-quoted plans aren't included.
All plans and prices
Copyleaks AI Detector
FreeFree
Personal$16.99/mo, or $13.99/mo billed annually
Pro$99.99/mo, or $74.99/mo billed annually
Education / EnterpriseCustom
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
Price changes we've recorded
We re-read each pricing page every month and log what changed.
Copyleaks AI Detector
No changes since we started tracking.
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
Strengths and limitations
Copyleaks AI Detector
- Free credits for new users
- Covers AI detection, plagiarism and image detection in one plan
- Annual billing lowers Personal to $13.99/mo
- Unused monthly credits are cancelled at the end of each month
- API and LMS access only on custom-priced plans
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
More comparisons
Other options to consider
GG
Freemium
G
AI text detector with plagiarism checks and writing replay for educators
AI DetectorsFree planAPI
O
OAI content detection, plagiarism and fact checking for publishers and educators
Free, from $12.95/mo
O
Free, from $12.95/mo
O
AI content detection, plagiarism and fact checking for publishers and educators
AI DetectorsFree planAPI
R
RDeepfake detection for audio, video and images, with API and meeting protection
From $280/mo
R
From $280/mo
R
Deepfake detection for audio, video and images, with API and meeting protection
Security & FraudAPI
S
SS
From $29.99/mo
H
HRewrites AI-generated text to read as human, with a built-in AI detector
Free, from $9.99/mo
H
Free, from $9.99/mo
H
Rewrites AI-generated text to read as human, with a built-in AI detector
AI HumanizersFree planAPI
W
WRewrites AI-generated text to read naturally, with a built-in AI detector
Free, from $12/mo
W
Free, from $12/mo
W
Rewrites AI-generated text to read naturally, with a built-in AI detector
AI HumanizersFree planAPI
Facts from each vendor's public pages, prices checked Oct 26, 2026. Editorial policy