Undetectable AI’s Cowl Letter Generator, like most of their instruments, isn’t attempting to impress you with flashy language or intelligent turns of phrase. It’s targeted on one factor: serving to you get previous the primary spherical of filters — together with, generally, different AI instruments constructed to smell out whether or not you used AI within the first place.
Grammarly, alternatively, is greatest recognized for grammar fixes and sentence sprucing. However not too long ago, they’ve expanded into AI detection. Meaning we’ve reached an odd second the place one AI software is producing your job utility, and one other is judging whether or not it feels “too” generated.
So how do these instruments stack up when utilized in the identical workflow? Let’s take a more in-depth look.
What’s Undetectable AI?
Undetectable AI is a software designed to make AI-generated content material sound human.
It focuses on rewriting content material to bypass detection instruments — those that flag overly robotic phrasing or suspiciously excellent grammar. The place most AI instruments purpose for velocity or tone, Undetectable AI goals for believability.

It’s utilized by college students, entrepreneurs, freelance writers, and now, job seekers. The objective is easy: use the velocity of AI with out getting flagged for it.
Just lately, it launched a characteristic particularly for individuals making use of to jobs — and that’s the place the Cowl Letter Generator is available in.
What’s Undetectable AI’s Cowl Letter Generator?
The Cowl Letter Generator is easy. You paste in your resume, particulars in regards to the job, and possibly a blurb or two about your expertise — and it spits out a clear, human-sounding cowl letter.
The important thing distinction is that the output is designed to keep away from sounding like AI wrote it.
The writing deliberately avoids widespread AI giveaways like “I’m thrilled to use…” or “With a confirmed monitor document…” As an alternative, it leans into pure phrasing, comparable to: “I’ve spent the previous few years doing [X], and this position appears like the following step.”
It’s constructed with job boards and recruiters in thoughts. The type of cowl letter that received’t increase crimson flags with AI detectors — or actual individuals.
What’s Grammarly?
Grammarly has been round eternally within the web years. What began as a grammar checker is now a full writing assistant — suggesting rewrites, altering tone, and providing AI-generated content material in real-time.

However in the course of all these updates, Grammarly additionally launched one thing else: its personal AI detector.
What’s Grammarly’s AI Detector?
Grammarly’s AI Detector is precisely what it feels like — a software that guesses whether or not an article was AI-generated.
It’s not tremendous detailed. You paste in your textual content and get a brief verdict, often one thing like “Sounds human” or “Seemingly AI.”
It’s fast, and it really works okay when you’re straight-from-ChatGPT content material. However the second that writing will get cleaned up or stylized — particularly by a humanizer like Undetectable AI — Grammarly tends to overlook.
Nonetheless, it’s constructed into the Grammarly ecosystem. So when you’re already utilizing it for modifying, it’s a simple strategy to double-check your individual output.
Undetectable AI’s Cowl Letter Generator vs. Grammarly’s AI Detector
Take a look at #1
Undetectable AI: Doesn’t go the AI detection take a look at.
AI Chance Rating: 100%


Take a look at #2
Undetectable AI: Passes the AI detection take a look at.
AI Chance Rating: 12%


Take a look at #3
Undetectable AI: Grammarly AI Detector is confused!
AI Chance Rating: 50%


Take a look at #4
Undetectable AI: Passes the AI detection take a look at.
AI Chance Rating: 0%


Take a look at #5
Undetectable AI: Passes the AI detection take a look at.
AI Chance Rating: 25%


General Rating
Undetectable AI vs. Grammarly AI Detector |
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The Backside Line
Undetectable AI’s Cowl Letter Generator isn’t attempting to reinvent the quilt letter. It’s simply attempting to make it human-sounding and tailor-made — quick. And based mostly on the take a look at scores, it does that job fairly nicely.
Grammarly’s AI Detector, in the meantime, performs the position of gatekeeper. It’s a bit respectable at catching apparent AI content material, however struggles when that content material’s been rewritten to sound extra pure, which is Undetectable AI’s forte.
For those who’re utilizing AI that can assist you apply to jobs, this matchup issues. The very last thing you need is to get filtered out for utilizing a software that’s supposed to assist.
Up to now? Undetectable AI is forward within the one space that counts: staying undetected. And for job seekers attempting to chop via the noise, that edge makes a distinction.