Undetectable AI vs WriteHuman

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

Cheaper paid plan: Undetectable AI — $9.99/mo vs $12/mo for WriteHuman
Free plan: Both have one
Public API: Both have one
Best fit: Undetectable AI: Marketers cleaning up bulk LLM drafts before publishing · WriteHuman: Editing machine drafts into prose that sounds less uniform
Platforms: Undetectable AI: Web, Chrome extension · WriteHuman: Web, Chrome extension, iOS, Android

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

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

WriteHumanRewrites AI-generated text to read as human and scores it against detector models

Side by side

Fact	Undetectable AI	WriteHuman
Category	AI Detection & Humanizers	AI Detection & Humanizers
Pricing model	Freemium	Freemium
Starts at	$9.99/mo	$12/mo
Public API	Yes	Yes
Trust score	89 / 100	90 / 100
Platforms	Web, API, Chrome extension	Web, Chrome extension, iOS, Android, API
Company	Undetectable Inc.	WriteHuman LLC
Launched	2023	—
Last verified	Oct 15, 2026	Oct 15, 2026

What our research says

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

WriteHuman

As humanizers go this one is unusually transparent about its own scoring, showing per-sentence detection probability instead of a single vague pass mark, and its surface area — extension, mobile apps, API, MCP — is wider than most rivals. The catch is what the tool is for: passing AI-detection checks breaches most academic integrity policies, and no vendor can guarantee any detector's verdict.

Pros

Sentence-level detection scores rather than a single opaque verdict
Chrome extension, iOS and Android apps, plus a documented API and MCP access
Free tier lets you judge output quality before paying
Annual billing cuts the effective monthly rate by roughly a third

Cons

Request counts and word caps are tight on the lower tiers
Detector outcomes are probabilistic and shift as detectors are retrained
Use is disallowed by most academic integrity policies

Which one fits

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

Choose WriteHuman if you need

Editing machine drafts into prose that sounds less uniform
Non-native writers smoothing generated text across 40-plus languages
Developers who want rewriting inside their own pipeline via the API