How this checker works
AI detector with sentence-level highlights
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. The names below are a per-label guide based on one AI score. Results vary by detector, text length and topic, and no tool can guarantee a result. How we test AI detectors. How the score is produced.
Step 1
Paste the text to score
Essays, emails, posts — anything you want a read on before you submit or publish.
Step 2
Read the score and labels
The labels are a per-label guide based on one AI score. Sentence highlights show which lines still look generated.
Per-label guide based on one AI score
These names are labels on a single score. They are not live results from those detectors.
- Turnitin
- GPTZero
- Copyleaks
- ZeroGPT
- Crossplag
- Sapling
- Quillbot
- OpenAI
- Claude
- Gemini
- Grok
- Grammarly
Trusted by 9,000+ students, researchers, and content writers worldwide
Engineered for
Natural Writing
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
Keeps the writing clear, natural, and consistent.
Ask AI to Fix Selection
Select any text and use AI to improve, fix grammar, shorten, lengthen, or customize with your own prompts.
Named engines on the score grid
These twelve names appear as labels on a single scoring pass. They are not live API calls to those vendors. See the outline above for right, warn, and bad.
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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