Undetectable AI Is Uneven on Long Drafts.
Undetectable AI starts at $9.99/month with a 250-word free trial (vendor pricing page, checked Sept 2026). SupWriter is the same starting price, with 300 free words and a check before you submit.
Where Undetectable AI Falls Short
250-Word Free Trial
Undetectable AI's free trial is 250 words (vendor pricing page, checked Sept 2026). SupWriter gives you 300 free words, with no credit card.
Meaning Drift
Undetectable AI sometimes changes what a sentence actually says. That's a problem for academic work, where the argument has to stay yours.
Experience the Difference - Try SupWriter Now
See how SupWriter turns an AI-assisted draft into writing in your own voice. Undetectable AI is a different kind of tool.
Trusted by 9,000+ students, researchers, and content writers worldwide
Undetectable AI Alternatives, Compared on Price and Fit
Same questions for each: what it costs, what you can try free, and whether the rewrite keeps your voice.
SupWriter
$9.99/monthAn AI humanizer for the full draft, from a short note to a long paper, with meaning kept and your vocabulary level left alone. 300 free words, no credit card. Fix Selection rewrites one paragraph instead of the whole document. Includes a detector you can read before you submit — one scoring model, not your school or client's.
Undetectable AI
$9.99/monthA real humanizer with a clean interface. 250-word free trial (vendor pricing page, checked Sept 2026). Higher tiers if you want the stronger modes.
NaturalWrite
$14.99/monthA mid-range humanizer. The built-in detector can disagree with other tools, so treat any single score as a pre-check, not a verdict. Fine for casual drafts. $14.99/month is a step up from SupWriter's $9.99 if you're mostly comparing price.
WriteHuman
$12/monthStraightforward interface at $12/month. WriteHuman includes an AI detector (vendor site, checked Sept 2026). Language support is limited compared with SupWriter's 50+ languages.
JustDone AI
$29.99/month (vendor pricing page, checked Sept 2026)The $2 7-day trial auto-renews at $29.99/month (vendor pricing page, checked Sept 2026), and cancellation is a headache. Humanizing is one feature in a large suite. You pay suite prices for a rewrite you can get in a focused tool at $9.99/month.
Compare the Free Trial Before You Subscribe
Undetectable AI's free trial is 250 words (vendor pricing page, checked Sept 2026). SupWriter's free tier is 300 words. Read a sample of your own draft in each tool before you subscribe.
SupWriter is an AI humanizer aimed at keeping your meaning and your vocabulary level, including clear English for ESL writers.
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.
For a wider price and feature comparison, see our best AI humanizer tools roundup. Grammar checkers and paraphrasers are a different job — that split is in Grammarly vs QuillBot.
Related Resources
- Grammarly Alternative — Grammar checker vs AI humanizer
- QuillBot Alternative — Paraphraser vs AI humanizer
- JustDone AI Alternative — Suite pricing vs a focused humanizer
- Best AI Humanizer Tools (2026) — Price, languages, and features
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.
Your Text
Paste your AI-generated text here
Paste Your AI-Generated Text
Copy any content — assignments, blog posts, or AI-generated text.
Result
Check AI Score
See how much of your text is flagged as AI-written by detection systems.
Edit or review selection
Use AI to do more
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.
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.
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. How we test AI detectors
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.
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.
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.
It's so great and I love this app. Everyone should use it. It helped me pass my essay!
What impressed me most is how seamlessly SupWriter polishes my drafts. My clients noticed the difference in quality and tone immediately.
Absolutely wonderful. The best AI humanizer I've used, especially for scientific writing.
This tool lets me do so many things faster, and its features are genuinely useful.
Really good. I didn't expect it to be this great. It genuinely enhanced my writing. Give it a try.
This product is so good. I'll choose it over and over again. It has my heart. ❤️
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.
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.
It was amazing. I upgraded, and since then my work has consistently scored high marks.
The best humanizer ever.
It was great, especially in a foreign language. It helped the adjectives come out smoother than I expected!
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.
Precisely written and a very nice app. I recommend everyone give it a try.
I was amazed to see the AI-flagged text identified so accurately. It really helps crack down on AI interventions.
My professor commended the uniqueness of my essay after I used SupWriter to make it sound natural. Strongly recommended for students!
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!
It's been a great tool to use, and very helpful.
My experience with the AI detector was great. The interface is simple and easy to navigate, and results came back quickly with useful detail.
This experience has been amazing, and the service is extremely helpful.
My experience was amazing. SupWriter is very easy to use, and it actually works!
Impressed by the quality, and cheaper than other platforms.
SupWriter is great. It helps me become a better writer and a better student overall.
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