Undetectable AI: Pricing, Word Limits and an Honest Look at What It Can and Cannot Do
Paste AI-generated text and get a version matched to your own writing level. A free tier handles 250 words so you can judge it first.
What to do
- Select Open Undetectable AI.
- Create an account, or sign in if you already have one.
- Use the free 250-word allowance on a real paragraph of your own text and read the output critically.
- Estimate your monthly word volume and match it to the 10,000, 20,000, 35,000 or 50,000 word tier.
- Confirm the plan, word limit, billing period and renewal total on the checkout screen before paying.
Word allowances reset monthly and differ substantially between tiers. Annual billing is charged as a single payment. Confirm the plan, the word limit and the renewal total on the checkout screen before paying.
I may receive a reward if you use this link or code.
Undetectable AI plan check: July 29, 2026
Every figure below was read from Undetectable AI's own pricing page on July 29, 2026. Prices and word allowances change without notice, so treat this as a dated snapshot.
- Offer destination
- Official Undetectable AI websiteThe Open Undetectable AI button finishes on undetectable.ai. Create the account there.
- Free tier
- 250 words, no payment requiredEnough to test output quality on a real paragraph before committing to a plan.
- Entry plan
- 10,000 words a month$9.99 monthly, or $60 a year which the site presents as $5.00 a month.
- Mid plans
- 20,000 and 35,000 words a month$19.00 and $31.00 monthly, or $114 and $189 a year respectively.
- Top self-serve plan
- 50,000 words a month$42.50 monthly. Undetectable AI lists this tier as including all features from the other plans.
- Visitor benefit through this page
- None beyond the public pricingThis page carries an affiliate link. It does not unlock a discount and no code on this site changes the price.
No tool can guarantee how any AI detector will classify a given piece of text, and detector behaviour changes without notice. Undetectable AI advertises a money-back guarantee if content is flagged as non-human, which is a commercial promise rather than a technical guarantee, so read its exact terms before relying on it. Word allowances are monthly and do not roll over on standard plans. Many institutions and publishers have their own rules about AI-assisted writing, and using a rewriting tool does not change what those rules require you to disclose. Prices and limits change without notice.
- Undetectable AI pricing
- Undetectable AI affiliate programme
- Undetectable AI homepage and product overview
Offer details checked against these provider pages on Jul 29, 2026.
What Undetectable AI actually does
Undetectable AI takes text that was generated by an AI model and rewrites it so that it reads less like machine output. The input is a block of text; the output is a rewritten version of the same content.
Writing level matching is the feature that separates it from a generic paraphraser. You select the register you want, so the rewrite can target a specific standard of writing rather than flattening everything into the same voice.
The service also includes AI detection in the other direction. Plans advertise unlimited AI detecting, so the same account can check text as well as rewrite it, which is useful for seeing how a given passage is being classified.
An unlimited human auto typer is bundled with all paid tiers, along with API compatibility for teams that want the rewriting step inside an existing pipeline rather than in a browser tab.
Word allowances are the only meaningful difference between the paid tiers. The 10,000, 20,000, 35,000 and 50,000 word plans carry the same features as each other, so the choice is purely about monthly volume.
A Business plan exists with custom pricing, non-expiring credits, redistribution and white labelling, priority support and access to a smart job applier. Non-expiring credits are the substantive difference for irregular usage patterns.
The free tier handles 250 words. That is one solid paragraph, which is enough to judge whether the rewrite preserves your meaning without paying to find out.
Undetectable AI advertises a money-back guarantee if content is flagged as non-human. Read the exact terms of that guarantee before treating it as a safety net, because it is a commercial policy and not a technical assurance about any specific detector.
Judge the output before you judge the price
The free tier rewrites 250 words. That is enough to see whether the rewritten text still says what you meant, which is the question that actually decides whether this tool is useful to you.
Paid plans start at 10,000 words a month.Undetectable AI pricing in 2026: every plan compared
The paid tiers all carry the same features. The only variable is how many words you can process each month, which makes this an unusually simple pricing decision once you know your volume.
All figures below were read from Undetectable AI's pricing page on July 29, 2026.
| Plan | Words per month | Monthly | Annual |
|---|---|---|---|
| Free | 250 words total | $0 | $0 |
| 10K | 10,000 | $9.99 | $60.00 ($5.00/mo) |
| 20K | 20,000 | $19.00 | $114.00 ($9.50/mo) |
| 35K | 35,000 | $31.00 | $189.00 ($15.75/mo) |
| 50K | 50,000 | $42.50 | Charged at the monthly rate |
What the free 250-word tier is genuinely for
Two hundred and fifty words is one substantial paragraph. It is not a usable working allowance and it is not meant to be.
What it is good for is the only test that matters: paste a paragraph you wrote or generated yourself, read the rewrite, and decide whether it still says what you meant. Rewriting tools routinely preserve surface fluency while quietly changing emphasis, softening claims or introducing small factual drift.
Judge it on your own text, not on a demo sample chosen by the vendor.
What no AI humanizer can promise you
This section exists because the category oversells itself, and a page that repeated those claims would not be worth reading.
AI detectors are probabilistic classifiers. They are updated without notice, they disagree with each other, and they produce false positives on genuine human writing, including on the work of people who never used an AI tool at all. That means no rewriting service can guarantee how any specific detector will classify any specific passage tomorrow.
Undetectable AI advertises a money-back guarantee if content is flagged as non-human. That is a commercial policy, and a reasonable one, but it refunds money rather than fixing a classification. Read its exact terms before relying on it.
Treat any 'guaranteed undetectable' framing anywhere in this category as marketing rather than a technical statement.
The rules that apply to you have not changed
Universities, publishers, employers and clients increasingly set explicit expectations about AI-assisted writing, and those expectations are about disclosure and authorship rather than about detection.
Rewriting text does not alter what a policy requires you to declare. If you are bound by an academic integrity code, a publisher's contributor terms or a client agreement, the obligation is unchanged by which tools sat between the draft and the final copy.
This site's position is that the useful application of these tools is editing and voice-matching your own work, and that anyone using one should first know what they are actually required to disclose.
Detection and rewriting are two halves of one question
Undetectable AI includes AI detection alongside rewriting, so a single account can both check how text is classified and rewrite it.
Anyone genuinely trying to understand this space benefits from looking at both sides. Detection tools show you how classifiers behave, including how often they flag writing that no AI touched, which is the fastest way to see why 'undetectable' is a weaker promise than it sounds.
This site also lists TruthScan on the detection side, which is a useful counterweight when forming a view.
Who this tool actually suits
It suits writers using AI for drafting who want output that matches their own register rather than the flat default voice of a large language model, and who are editing their own work within rules they understand.
It suits teams processing consistent monthly volume who want the rewriting step available through an API rather than a browser tab.
It does not suit anyone hoping for a guarantee about detector behaviour, because that guarantee does not exist from any vendor in this category.
- Choose the 10K plan for light personal use of roughly two thousand words a week.
- Choose 20K or 35K for regular content production.
- Choose 50K or Business for team volume, and look at Business specifically if your usage is irregular, because its credits do not expire.
Is Undetectable AI worth paying for?
At $5 a month on annual billing for 10,000 words, the entry tier is inexpensive enough that the decision rests entirely on output quality rather than price.
That makes the free 250 words the whole evaluation. If the rewrite preserves your meaning and matches your register, the cheapest tier that covers your volume is straightforward value. If it does not, no tier is worth paying for.
Spend the ten minutes on the free tier before you spend anything else.
Before you start
- Estimate your monthly word volume before looking at prices. The paid tiers differ only by allowance, so the correct plan is whichever covers your actual output with a little headroom.
- Run a real paragraph of your own through the free 250-word tier. Generic demos prove nothing; the question is whether the rewrite still says what you meant.
- Check the rules that apply to you. Universities, publishers, employers and clients increasingly have explicit policies on AI-assisted writing, and a rewriting tool does not change what those policies require you to disclose.
- Read the money-back guarantee terms rather than the headline. Understand what evidence it requires and what it actually refunds before relying on it.
- Decide whether you need the API. It is listed as available across paid plans, but confirm it covers your intended integration before building anything on it.
- If your usage is irregular rather than monthly, look at the Business plan, because non-expiring credits suit sporadic volume better than an allowance that resets and disappears.
How to confirm it worked
- The Open Undetectable AI button should finish on undetectable.ai before you create an account or enter payment details.
- The word allowance shown at checkout should match the tier you selected on the pricing page.
- Annual plans should display the full amount charged, not only the per-month equivalent.
- The free tier should not request payment details for the first 250 words.
- Any promotional discount shown at checkout should state what the price reverts to on renewal.
Word limits are the real difference between plans
Every paid tier carries the same feature set. What changes is the monthly word allowance, running from 10,000 to 50,000 words. Estimate your monthly volume first and the right plan picks itself.
Confirm your plan, word limit and renewal total at checkout.FAQ
More Software offers
I may receive a reward if you use a link or code below.
Detect AI Images and Text
Detection for AI-generated text, images, video and audio. The free plan covers 25 results a month with full API access.
$5 in Cloud Credits
$5 in DigitalOcean cloud credits for new accounts created through the referral link and activated with a valid card or PayPal. Usage beyond $5 is billed.
Up to 75% Off + 3 Months
Up to 75% off plus 3 extra months on an eligible NordVPN long-term plan through the approved link. No promo code is needed.