Grammar and paraphrasing
AI Undetect: review, pricing, data and alternatives
AI Undetect lets people revising texts rephrase them while preserving their subject. It imports documents, compares results from multiple AI text detectors, and automates rephrasing through an API. A free tier exists; the first paid plan costs $5 per month. Access and transparency score: 53/100, #9 of 11 in its category.
What is AI Undetect?
AI Undetect lets people revising texts rephrase them while preserving their subject. It imports documents, compares results from multiple AI text detectors, and automates rephrasing through an API.
According to its documentation, AI Undetect lets you:
- rewrite text while preserving its subject
- compare results from multiple AI text detectors
- import a document to rephrase
- automate rephrasing through an API
We file it under Grammar and paraphrasing, the category of tools to fix and rephrase text, and it also overlaps with aI content detection. The category lists 11 verified tools on this site.
The publisher is AIundetect LLC, based in Hong Kong SAR China.
Who is it for?
It is mostly useful to these profiles: content writers and marketers. The need it covers is simple to state: fix and rephrase text.
AI Undetect is a good candidate if:
- you want to try before paying
- you plan to connect it to your tools or automations through its API
Before deciding, run a trial on a real task and measure the time saved: it is the only criterion that really counts.
How much does AI Undetect cost?
Pricing model: freemium (limited free use, then paid). A free plan is offered, usually limited in volume or features.
The first paid plan costs $5 per month (Basic, monthly equivalent with annual billing; 10,000 words per month), according to the pricing page, checked on October 24, 2026.
Per month, that is cheaper than the category median ($8 per month, based on tools with a published price).
To estimate what the same work would cost done directly with an AI model, use our API price calculator. Prices change often: always check the official site before subscribing.
Data and privacy
The publisher does not clearly state where data is hosted. Assume your content may leave your region.
For professional use, check that a data processing agreement (DPA) is offered, and do not send customers' personal data or confidential documents without one.
No export feature is documented: keep a copy of your content elsewhere.
Three habits apply to every AI tool:
- turn off the use of your content for training if the option exists
- use a work account separate from your personal account
- review everything the tool produces before publishing or sending it
Platforms, languages and API
AI Undetect runs on: web browser and API.
The interface is available in 20 languages.
A public API lets you call it from your own programs or an automation tool, and plug it into an AI agent.
How we scored it
Our 53/100 score does not judge output quality: it measures what can be publicly verified about access to the tool, its openness and how far the publisher can be trusted.
| Criterion | Points | What counts |
|---|---|---|
| Access | 30/30 | free tier, published price, French interface |
| Openness | 10/30 | API, data export, open code |
| Trust | 13/40 | identified publisher, declared hosting, age, presence in reference lists |
The full calculation is explained on our method page.
Comparison with alternatives
AI Undetect against other tools in the grammar and paraphrasing category:
| Tool | Free | Entry price | API | Score |
|---|---|---|---|---|
| AI Undetect | Yes | $5 per month | Yes | 53 |
| LanguageTool | Yes | not published | Yes | 75 |
| Grammarly | Yes | $12 per month | – | 73 |
| Wordtune | Yes | $6.99 per month | Yes | 71 |
| WriteHuman | Yes | $12 per month | Yes | 68 |
| Quillbot | Yes | €8.33 per month | No | 61 |
| editGPT | Yes | $96 per year | – | 61 |
| HumanizeAI.com | Yes | $14 per month | Yes | 58 |
Verdict
AI Undetect publishes little verifiable information: look at the better-scored alternatives first.
Strengths
- Free tier to try it
- Cheaper than its category median
- Public API
Limitations
- Data hosting not disclosed
- Data export not documented
Avoid if…
- You handle sensitive personal data without a processing agreement
- You need to easily retrieve your full history
Alternatives
- LanguageToolfree tier
- Grammarlyfree tier
- Wordtunefree tier
- WriteHumanfree tier
- Quillbotfree tier
- editGPTfree tier
Categories and jobs
Learn more
Frequently asked questions
Is AI Undetect free?
Yes, a free plan exists, with usage limits. The first paid plan costs $5 per month.
Where is AI Undetect data stored?
The publisher does not clearly say so in its public documentation.
Does AI Undetect have an API?
Yes, a public API is documented.
What are the alternatives to AI Undetect?
In the same category: LanguageTool, Grammarly, Wordtune, and WriteHuman.
AI Undetect or LanguageTool: which one to choose?
Our score is 53/100 for AI Undetect and 75/100 for LanguageTool. Try both on the same task before paying.
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Neutrality. No affiliate links. No vendor pays to be reviewed, rated or ranked. Reviews are directed by François Chollet, neutral and factual, and every data point is dated and sourced. How we score