SupWriter is a writing tool. Follow your school's or employer's rules on AI use.
Check a Draft Before You Submit
Turn AI-assisted drafts into clear, natural writing in your own voice, including for non-native (ESL) writers. The extension includes an AI detector with sentence-level highlights so you can check a draft before you submit.
Understanding How AI Detectors Flag Content
Detectors look at patterns in a draft. A rewrite can make the writing clearer. It cannot guarantee what another detector will say.
Perplexity Analysis
What detectors check
AI text has measurably lower perplexity — each word is more predictable given the previous words. Detectors score this predictability on a scale.
What a rewrite changes
A rewrite can vary wording so the draft sounds more like you. It does not guarantee a detector result.
Sentence Pattern Uniformity
What detectors check
AI tends to produce sentences of similar length and structure. Humans naturally vary between short punchy sentences and longer complex ones.
What a rewrite changes
A rewrite can vary sentence length and rhythm. It does not guarantee a detector result.
Vocabulary Distribution
What detectors check
AI models favor certain phrases and avoid others in statistically measurable ways. Words like 'moreover', 'crucial', and 'delve' appear at higher-than-human rates.
What a rewrite changes
A rewrite can use more ordinary word choices. It does not guarantee a detector result.
Why a Synonym Swap Can Still Sound Stiff
Synonym swapping preserves AI patterns
Replacing individual words doesn't change the underlying sentence structure or rhythm. The draft can still sound stiff, even when the words are different.
Sentence rearrangement alone isn't enough
Moving sentences around changes organization. Each sentence can still sound the same, so the draft may still read stiffly.
SupWriter rewrites for a natural voice
SupWriter rewrites sentence rhythm and word choice so the draft reads more naturally in your own voice. Check it with the built-in AI detector before you submit. Results vary by detector, text length and topic, and no tool can guarantee a result.
Check a Draft Before You Submit
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.
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.
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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