G
GOriginality.ai vs Undetectable AI
Pricing, features, platforms and who each one suits — side by side.
O
Choose Originality.ai if…
- you're in its core audience: content publishers, marketing agencies
U
Choose Undetectable AI if…
- you want the lower entry price ($5/mo vs $12.95/mo)
- you're in its core audience: students, content writers and marketers
Side by side
Feature Originality.ai Undetectable AI
Pricing modelFreemiumFreemium
Starting price$12.95/mo$5/mo
Free plan
Free trial
API
Open source
Cost per 1,000 words processed$0.065—
Trains AI on your contentYes, unless you opt out—
Data retentionScan history kept 30 days (Pro) or 365 days (Enterprise)—
Sentence-level highlights—
Plagiarism checker—
Writing replay—
Bulk processing—
Shareable reports—
Docs/LMS integration—
PlatformsWeb, Chrome, APIWeb, Chrome, API
CategoryAI DetectorsAI Humanizers
CompanyOriginality AI Inc. · Canada · since 2022Undetectable Inc.
Full feature lists
O Originality.ai
- AI text detection with sentence-level highlights
- Plagiarism checker
- Fact and AI hallucination checker
- Grammar and readability checkers
- Bulk Scan for many documents
- Writing Replay showing how a document was written
- Deep Scan editing suggestions
- Shareable reports and PDF downloads
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.
Originality.ai · originality.ai
Undetectable AI · undetectable.aiWhat 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
- Originality.aiPro$12.95/mo
The cheapest paid plan with a published price that fits. Custom and sales-quoted plans aren't included.
What the free plans include
Originality.ai
- 10K words (100 credits one time)
- 60 credits (3 scans/day)
- 1 credit = 100 words
Undetectable AI
Free plan limits aren't published.
All plans and prices
Originality.ai
FreeFree
Pro$14.95/mo, or $12.95/mo billed yearly ($155.40/yr)
Enterprise$179/mo, or $136.58/mo billed yearly ($1,638.96/yr)
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.
Originality.ai
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
Originality.ai
- Free tier includes AI, plagiarism, grammar and fact checks
- Pro plan starts at $12.95/mo billed yearly
- Integrations for Chrome, Firefox, Google Docs, Moodle and Google Classroom
- Detects text that was paraphrased with AI
- API access only on the $179/mo Enterprise plan
- Credit-based usage: 1 credit equals 100 words
- Pricing page gives conflicting details on free credits and Pro scan history
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
C
CDetects AI-generated text and images and checks for plagiarism
Free, from $13.99/mo
C
Free, from $13.99/mo
C
Detects AI-generated text and images and checks for plagiarism
AI DetectorsFree planAPI
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
B
BB
Freemium
B
Rewrites AI-generated text to read as human for students and marketers
AI HumanizersFree planAPI
Facts from each vendor's public pages, prices checked Oct 26, 2026. Editorial policy