What can I try for free?

StealthWriter's trial is 200 words. SupWriter's is 300 words, no credit card, on the same humanizer as the paid plan.

Which languages are supported?

StealthWriter is English only. SupWriter supports 50+ languages, including clearer, more natural English for ESL writers.

SupWriter

App Store

Now on iPhone & iPadApp Store ↗

Best StealthWriter Alternative

StealthWriter Is $19.99.
Natural Writing Costs Half.

StealthWriter is one of the more expensive AI humanizers: $19.99/month, English only, 200 free words, and it includes an AI detector (vendor site, checked Sept 2026). SupWriter is $9.99/month, 50+ languages, 300 free words, and a pre-check before you submit.

300 free words - No credit card required

Feature

StealthWriter

SupWriter

Purpose

AI rewriting

AI text humanizer

Language Support

English only

50+ languages

Free Trial

200 words

300 words

Built-in AI Detector

Starting Price

$19.99/month

$9.99/month

Why StealthWriter Falls Short

💰

Overpriced at $19.99/month

You pay about double SupWriter's $9.99/month for an English-only humanizer.

🌐

English Only

If you write in another language, or you want natural English as an ESL writer, StealthWriter doesn't cover it. SupWriter supports 50+ languages.

🔍

StealthWriter Includes a Detector

StealthWriter includes an AI detector (vendor site, checked Sept 2026). SupWriter's check is one scoring model, not your school's detector. Meaning can also drift on technical drafts.

Experience the Difference - Try SupWriter Now

See how SupWriter turns an AI-assisted draft into writing in your own voice. StealthWriter is a different kind of tool.

Trusted by 9,000+ students, researchers, and content writers worldwide

Humanize AI Writing in 3 Simple Steps

Turn an AI-assisted draft into clear, natural writing in your own voice, then check it before you submit.

Step 1

Your Text

Paste your AI-generated text here

Paste Your AI-Generated Text

Copy any content — assignments, blog posts, or AI-generated text.

Step 2

Result

Varies

Check before you submit

Check AI Score

See how much of your text is flagged as AI-written by detection systems.

Step 3

or select text & ask AI

Ask or type your prompt...

Edit or review selection

Improve writing

Fix grammar

Make shorter

Make longer

Use AI to do more

Continue writing

Humanize & Improve selection

Rewrite the draft so it sounds like you. Select any text to improve it, fix the grammar, shorten it, or lengthen it.

StealthWriter Is a High Price for a Narrow Humanizer

The name promises writing that disappears. What you actually get is an English-only rewriter at $19.99/month, with a 200-word trial and an AI detector (vendor site, checked Sept 2026). Meaning sometimes drifts, especially on technical drafts. That's an expensive way to find out the paragraph no longer says what you wrote.

SupWriter is $9.99/month. The free tier is 300 words — 100 more than StealthWriter — with no credit card, on the same humanizer as the paid plan.

SupWriter vs. StealthWriter

Price: $9.99/month versus $19.99/month.
Free trial: 300 words versus 200 words.
Languages: 50+ versus English only.
Meaning: SupWriter keeps technical wording. StealthWriter can drift.
Detector: SupWriter includes one. StealthWriter includes an AI detector (vendor site, checked Sept 2026).

SupWriter includes an AI detector so you can check a draft before you submit. It is a pre-check based on one scoring model, not the detector your school or client uses. Results vary by detector, text length and topic, and no tool can guarantee a result.

Who Should Switch

Students who want to read the draft first — StealthWriter includes an AI detector (vendor site, checked Sept 2026). The check in SupWriter is not your school's system.How AI detectors read a draft is the longer explanation.
Anyone writing outside English — or ESL writers who want clear English that still sounds like them, instead of a flat rewrite that false positives pick on.
Anyone comparing the bill — Half the price, more languages, a longer free tier. The category overview is our comparison of AI humanizer tools.

A paraphraser is a different tool. That comparison is on the QuillBot alternative page. Grammar checking is on the Grammarly alternative page.

Related Resources

Undetectable AI Alternative — Price, speed, and long drafts
QuillBot Alternative — Paraphraser vs AI humanizer

50+

Languages

300

Free words

9,000+

Writers

API · MCP · CLI

Included

Engineered for
Your Own Voice

SupWriter rewrites sentence structure, rhythm and word choice while keeping your meaning.

Advanced Linguistics

Analyzes syntax, tone, and word patterns to remove robotic footprints.

Smart Restructuring

Restructures sentences while preserving your original meaning and intent.

Adaptive Learning

Updated so you can check a draft before you submit, including for unfair AI-detection false positives.

Ask AI to Fix Selection

Select any text and use AI to improve, fix grammar, shorten, lengthen, or customize with your own prompts.

Check a draft before you submit

Detectors such as GPTZero, Turnitin, and ZeroGPT estimate whether a draft looks AI-written. They can also flag human writing.

Detectors schools and clients use. SupWriter doesn't query them.

ZeroGPT

Copyleaks

Turnitin

QuillBot

GPTZero

Grammarly SaplingOpenAIClaudeGeminiGrok

Use the built-in AI detector (free on paid plans) to review a draft before you submit. A score is an estimate, not a guarantee.

JKSMALRWMC9k+

9K+

Trusted by 9,000+ Writers Worldwide

Students polish their writing to sound more natural, marketers improve content for better engagement and SEO, and businesses send emails that feel personal — not robotic.

SupWriter adapts to each use case

Delivering clear, human-sounding text

That reads like it was written by you

Reviews

What our users say

What writers say about SupWriter

I've been using SupWriter for weeks, and it's become essential to my academic writing and research workflow. As a Ph.D. student in environmental law, I'm constantly drafting, refining, and translating complex texts, and SupWriter makes the whole process far more efficient and less stressful.

Henrry

Ph.D. Candidate

It's so great and I love this app. Everyone should use it. It helped me pass my essay!

Braxton H.

What impressed me most is how seamlessly SupWriter polishes my drafts. My clients noticed the difference in quality and tone immediately.

Brandon L.

Freelancer

Absolutely wonderful. The best AI humanizer I've used, especially for scientific writing.

Phoebe B.

Student

This tool lets me do so many things faster, and its features are genuinely useful.

Karima

Really good. I didn't expect it to be this great. It genuinely enhanced my writing. Give it a try.

Chris A.

Researcher

This product is so good. I'll choose it over and over again. It has my heart. ❤️

Rachel A.

Student

The Fix Selection feature is a game changer. I can select any text and improve it, fix the grammar, or make it shorter, and my content workflow has never been faster.

Aisha M.

Content Writer

Excellent service, really helpful for job applications, and it even has an AI detector. I'd highly recommend it to students, professors, and writers. An amazing writing tool.

Shania W.

It was amazing. I upgraded, and since then my work has consistently scored high marks.

Enzo H.

Student

The best humanizer ever.

Nikolay

It was great, especially in a foreign language. It helped the adjectives come out smoother than I expected!

Christina P.

Writer

I'm on the Ultra Monthly plan and bought $20 in extra credits. This platform is super good, and I'm planning to switch to the Yearly plan soon.

Ron

Ultra plan user

Precisely written and a very nice app. I recommend everyone give it a try.

Riya S.

Student

I was amazed to see the AI-flagged text identified so accurately. It really helps crack down on AI interventions.

Radhakrishnan

My professor commended the uniqueness of my essay after I used SupWriter to make it sound natural. Strongly recommended for students!

Marco D.

Student

The website is fantastic. It's clean, modern, and visually appealing. Navigation is intuitive, pages load fast, and everything works well on desktop and mobile. A smooth, enjoyable experience. I'm really impressed!

Korsmann

Student

It's been a great tool to use, and very helpful.

Adrianne

My experience with the AI detector was great. The interface is simple and easy to navigate, and results came back quickly with useful detail.

Kareem

Student

This experience has been amazing, and the service is extremely helpful.

Marshall

My experience was amazing. SupWriter is very easy to use, and it actually works!

Domenico F.

Student