Grammarly AI Humanizer vs Detektify: Which AI Humanizer Actually Works Better?

I tested Grammarly’s AI Humanizer against Detektify in a real AI-detection battle. Grammarly gave 54% AI similarity — Detektify brought it down to 15%. Here’s the full test and the final verdict.

Published on: Nov 26, 2025
check Reviewed by: Lucas Gray

I ran Detektify and tested it with other top tools for humanizing AI text.

My tool comprehensively beat:

Quillbot AI Humanizer

Undetectable AI Humanizer

Humanize AI Pro

And today, I’m going to compare our tool with another industry giant.

The aim is to test and find whether other top ranking tools stand a chance against Detektify AI Humanizer!

So today, I’ll test and compare it with “Grammarly’s AI Humanizer”.

It will totally be an honest review, I’ll record everything.

Let’s find out if Detektify can be an alternative to Grammarly AI Humanizer.

Introduction to AI Humanizer by Grammarly

Grammarly is the pioneer of Grammar Checker. 

The user interface is simple, sleek and easy to use.

They claim that the service is totally free.

And it supports 1500 words in a single go.

You can upload a file or start with a sample task.

Introduction to Detektify AI Humanizer

Detektify is emerging as the top tool for humanizing AI text.

Just like Grammarly’s tool, the UI is also simple, sleek, elegant, and easy to use.

It supports 500 words in a single go.

It offers different modes and supports top languages.

You don’t have to be a premium user to start humanizing AI text.

Top features of Grammarly’s AI humanizer vs Detektify

Before I start testing both, let's analyze the top features both services offer.

Features

Detektify Humanizer

Grammarly Humanizer

User Interface

Simple, Sleek, Easy

Simple, Sleek, Easy

Word Limit

500

1500

Increase word count

With Premium

With Premium

Writing Modes

4+

Default

Languages

All top Languages

Default

AI Detection

Yes

N/A

After checking the features, both seem to be quite decent. Grammarly offers more words in a single go, while Detektify gives more modes and supports other languages.

To declare which tool is superior in terms of performance, let’s start our test.

Grammarly AI Humanizer vs Detektify: A Real Test to Find the Winner

First, let’s generate a 100-word paragraph using ChatGPT.

Okay, so ChatGPT has generated a paragraph.

As a writer, the text is super low quality.

I can say this even by reading!

But still, I’ll use an AI detector to find if it has an AI writing score.

As per QuillBot, the text is 100% AI-written.

Good job, QuillBot, your AI detector is working fine at least!

Now that I’ve confirmed the text has 100% AI writing similarity, let’s use Grammarly’s tool to find out if it can humanize it properly.

I entered the same text I generated using ChatGPT and clicked on the “humanize” button.

The tool instantly gave me an output.

It is really quick, I must say.

Let’s copy this text to find out if it has any AI writing similarity.

I will again use QuillBot’s tools for testing this.

QuillBot’s tool is showing that the text has 54% AI writing similarity.

Good job by Grammarly AI Humanizer.

It at least has 45% accuracy.

Now, let’s test the same text using the Detektify AI Humanizer.

As I entered the text, it instantly showed the text is AI-generated.

The tool is definitely slower compared to Grammarly.

But let’s check if it can do the needful.

Wow. The tool says the AI percentage is only 15%.

As the test is completed, I can say that Detektify easily beats Grammarly in terms of performance.

Grammarly’s humanized text still had 55% AI similarity, while it only has 15%.

Key findings

Grammarly offers more words compared to Detektify.

Detektify is super lethal in performance, as it totally humanizes AI text.

Detektify supports other languages and offers different modes.

It is not as quick as Grammarly but works really better.

The premium version of Detektify is 47% cheaper than Grammarly.

Wrapping up

While having a bigger brand reputation, PR, audience, and rankings, Grammarly AI Humanizer couldn’t beat Detektify.

The main reason is the performance, effectiveness, and its ability to humanize AI text.

This is why Detektify is among the top tools for humanizing AI text and beats all main players easily.

If you haven’t tried it yet, go ahead.

It is free.