Is Undetectable AI free to use?

Yes. Undetectable AI has a free plan — Free detector; paid humanizer plans available

Does Undetectable AI have memory?

No persistent memory — sessions don't carry over by default.

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Undetectable AI Review

undetectable.ai →

AI detector and humanizer for text and images — checks if content was written by ChatGPT, GPT-5, Gemini, or other models.

Writing Assistants

Verdict

Undetectable AI is a dual-purpose platform rated #1 by Forbes: a free AI content detector (no sign-up required) plus a paid AI humanizer that rewrites text to bypass detection. It covers text from all major LLMs and now includes an image authenticity checker. The core tension is that its humanizer product actively undermines the detection use case, which raises ethical questions for academic and editorial users.

What it does

Paste your text into our free AI detector to see if it’s flagged as AI. Get instant results from our AI checker and ChatGPT detector.

Best for

Best for individuals and organizations who want to detect AI-generated content and make their AI-assisted writing appear human-like.

At a glance

Free planYes

Login requiredNo

MemoryNo

VoiceNo

Image generationYes

Group chatNo

Mobile appNo

NSFW policyNot applicable

PricingFree + paid — Free detector; paid humanizer plans available

Pros & cons

Pros

Free detector with no sign-up
Covers ChatGPT, GPT-5, Gemini, Claude, Llama
Also detects AI-generated images
Forbes #1 ranked detector

Cons

Humanizer product creates ethical conflict
Accuracy not guaranteed for all text lengths/languages
Paid tier required for humanizer features

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Frequently asked

Is Undetectable AI free to use?: Yes. Undetectable AI has a free plan — Free detector; paid humanizer plans available
Does Undetectable AI have memory?: No persistent memory — sessions don't carry over by default.
Can Undetectable AI do voice or images?: Voice: no. Image generation: yes.
What are the best alternatives to Undetectable AI?: Browse the AI Tools Directory for related tools.

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Notes from users

Concrete observations only — pricing changes, real-world feature behavior, what didn't work for you. Vague hot-takes get filtered out by automated review. No links allowed.

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