Undetectable AI alternatives

At a glance

We list 7 other AI detection tools as alternatives to Undetectable AI: GPTZero, Originality.ai, Pangram, Reality Defender, Sapling, Winston AI and ZeroGPT.
All of them have a free plan.
GPTZero, Originality.ai, Pangram and Sapling work with Google Docs, as Undetectable AI does.
Pangram works with Gmail, as Undetectable AI does.

From each tool's own website and from published reviews. Each tool's page says when its facts were checked.

7 alternatives

Listed alphabetically. A tool is ranked by its reviews once it has 3.

GPTZero
An AI detector that detects AI content and checks writing quality.
No reviews yet
Choose it over Undetectable AI for: Google Docs; integration with Canvas or Google Classroom.
Free plan
Yes
Paid plans from
Premium, A$17.99 per month, billed annually (as of November 14, 2026)
Platforms
Chrome, Google Docs
Integrations shared with Undetectable AI
Google Docs
Main features
AI detection, Writing replay, Plagiarism checker
Security and compliance
SOC 2, GDPR
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Originality.ai
An AI detector that identifies whether text was generated by platforms like ChatGPT, Gemini and Claude.
No reviews yet
Choose it over Undetectable AI for: Firefox or Moodle; integration with Moodle, Google Classroom or ChatGPT.
Free plan
Yes
Paid plans from
Pro, $12.95 per month, billed yearly (as of November 14, 2026)
Platforms
Chrome, Firefox, Moodle
Integrations shared with Undetectable AI
Google Docs
Main features
AI checker, Plagiarism checker, Bulk scan
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Pangram
An AI checker for ChatGPT, Claude and Gemini text.
No reviews yet
Choose it over Undetectable AI for: integration with Canvas, Google Classroom or Moodle.
Free plan
Yes
Paid plans from
Individual, $20 per month (as of November 14, 2026)
Free trial
7 days
Platforms
Chrome
Integrations shared with Undetectable AI
Google Docs, Gmail
Main features
AI segment analysis, AI assistance detection, Similarity checker
Security and compliance
SOC 2
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Reality Defender
Detect deepfakes in audio, video, and images, and identify AI callers.
No reviews yet
Choose it over Undetectable AI for: Web.
Free plan
Yes
Paid plans from
Business, $399 (as of November 14, 2026)
Platforms
Web
Main features
Browser file review, Live call detection, Meeting analysis
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Sapling
Free AI detector that checks if text is AI-generated.
No reviews yet
Choose it over Undetectable AI for: Firefox, Edge, Mac or Windows; integration with Zendesk, Salesforce or Slack.
Free plan
Yes
Paid plans from
Pro, $25 per month, or $12 per month billed annually (as of November 14, 2026)
Free trial
1 month
Platforms
Chrome, Firefox, Edge, Mac, Windows
Integrations shared with Undetectable AI
Google Docs
Main features
Sentence-level scores, PDF and Word checks, Web page checks
Security and compliance
SSO
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Winston AI
AI content detector and plagiarism checker for ChatGPT, Claude, Google Gemini and more.
No reviews yet
Choose it over Undetectable AI for: integration with Google Classroom, WordPress or Zapier.
Free plan
Yes
Paid plans from
Essential, $18 per month, monthly billing (as of November 14, 2026)
Free trial
14 days
Platforms
Chrome
Integrations shared with Undetectable AI
None in common
Main features
AI content detection, Plagiarism detection, AI image detection
Security and compliance
GDPR
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ZeroGPT
AI detection, plagiarism checking, and writing tools.
No reviews yet
Choose it over Undetectable AI for: WhatsApp or Telegram; integration with WhatsApp or Telegram.
Free plan
Yes
Plans
Free: $0 (as of November 14, 2026)
Platforms
WhatsApp, Telegram
Integrations shared with Undetectable AI
None in common
Main features
Highlighted sentences, Batch file upload, PDF reports
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At a glance

We list 7 other AI detection tools as alternatives to Undetectable AI: GPTZero, Originality.ai, Pangram, Reality Defender, Sapling, Winston AI and ZeroGPT.

All of them have a free plan.

GPTZero, Originality.ai, Pangram and Sapling work with Google Docs, as Undetectable AI does.

Pangram works with Gmail, as Undetectable AI does.

From each tool's own website and from published reviews. Each tool's page says when its facts were checked.