GPTinf vs Undetectable AI

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Free plan: Both have one
Public API: Undetectable AI has one; not confirmed by us for GPTinf
Higher Trust score: Undetectable AI — 89 vs 70 for GPTinf
Best fit: GPTinf: marketers loosening obviously templated AI copy before a human edit pass · Undetectable AI: Marketers cleaning up bulk LLM drafts before publishing
Platforms: GPTinf: Web · Undetectable AI: Web, Chrome extension

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

GPTinfRewrites AI-generated text to read as human-written

Undetectable AIRewrites machine-written drafts to read human, with detection scoring built in

Side by side

Fact	GPTinf	Undetectable AI
Category	AI Detection & Humanizers	AI Detection & Humanizers
Pricing model	Freemium	Freemium
Starts at	—	$9.99/mo
Public API	Not confirmed	Yes
Trust score	70 / 100	89 / 100
Platforms	Web	Web, API, Chrome extension
Company	—	Undetectable Inc.
Launched	—	2023
Last verified	Oct 15, 2026	Oct 15, 2026

What our research says

GPTinf

This is a detector-evasion rewriter and you should judge it as exactly that. If you are a student, running coursework through it is an academic-integrity violation whether or not the detector catches you.

Pros

word locking preserves citations, proper nouns and product names through the rewrite
a usable trial runs without an account, so you can judge output before paying
priced by word volume rather than per seat, which suits occasional use
one screen, no setup, no onboarding

Cons

independent reviews rate output as inconsistent, particularly across longer paragraphs
detector evasion is an arms race, so what passes this month can fail next month
no company name, team or jurisdiction disclosed anywhere on the site
no API, so it cannot be wired into a content pipeline

Undetectable AI

Buy it only if you accept that passing a detector is a moving target: detector vendors retrain constantly, and text that cleared last month can flag next month. As a multi-format detection dashboard it is more defensible than as a bypass tool.

Pros

Detector and rewriter run in one pass, so you see which sentences changed and why
Coverage extends past text into image, voice, video and document classifiers
Browser extension works inside Docs and Gmail rather than a separate tab
Entry tier is genuinely cheap at annual rates

Cons

Rewrites often flatten voice and add filler to break statistical patterns
Detection on short passages is unreliable in both directions
Word quotas drain fast because rejected attempts still consume them
The free trial caps at 250 words, barely enough to judge output quality

Which one fits

Choose GPTinf if you need

marketers loosening obviously templated AI copy before a human edit pass
stress-testing how brittle your own organisation's AI-detection policy is
writers who want a paraphrase pass with specific terms locked in place

Choose Undetectable AI if you need

Marketers cleaning up bulk LLM drafts before publishing
Editors wanting a second opinion on submitted copy
Teams screening images and audio for synthetic origin
Non-native writers smoothing register and tone