10K words
$5/mo billed yearly
Limits 10,000 words/month; yearly billing only, charged $60/year (sale price; list $9.99/mo). Unlimited AI detecting.Source: undetectable.ai (opens in new tab) · checked 2026-10-25
Undetectable AI pricing, usage limits and free plan (Oct 2026)
Undetectable Inc. · 4 paid plans tracked · from $5/mo · last checked 2026-10-25
Free tier · paid from
$5/mo
Try Undetectable AI (opens in new tab)Affiliate link: we may earn a commission. It never changes our data or rankings. DisclosureIs Undetectable AI free?
Free tier
Free AI Detector with no signup; the text box takes up to 10,000 words per check (a monthly cap isn't stated). The humanizer's free trial is limited to 250 words.Source: undetectable.ai (opens in new tab) · checked 2026-10-25
Undetectable AI plans, prices and usage limits
20K words
$19/mo
Billed yearly: $9.50/mo
Limits 20,000 words/month. Yearly charged $114/year (sale price). Unlimited AI detecting.Source: undetectable.ai (opens in new tab) · checked 2026-10-25
35K words
$31/mo
Billed yearly: $15.75/mo
Limits 35,000 words/month. Yearly charged $189/year (sale price). Unlimited AI detecting.Source: undetectable.ai (opens in new tab) · checked 2026-10-25
50K words
$42/mo
Billed yearly: $21.25/mo
Limits 50,000 words/month. Unlimited AI detecting.Source: undetectable.ai (opens in new tab) · checked 2026-10-25
Pick your Undetectable AI plan on undetectable.aiPrices above checked 2026-10-25. Confirm on the vendor's page before you pay.
Try Undetectable AI (opens in new tab)Affiliate link: we may earn a commission. DisclosurePrice watch
Get an email when Undetectable AI changes its prices or limits
We re-check undetectable.ai every day. One email per verified price, limit or free-tier change. No change logged yet.
Other productivity tools we track
Undetectable AI's cheapest paid plan: 20K words $19/mo. Prices are the month-to-month price of each tool's cheapest individual plan, the same basis as our rankings; "billed yearly" when that's all the vendor publishes.
How Undetectable AI's limits reset
| Plan | Price | Periods the vendor mentions |
|---|---|---|
| Free | $0 | Monthly |
| 10K words | $5/mo billed yearly | Monthly |
| 20K words | $19/mo | Monthly |
| 35K words | $31/mo | Monthly |
| 50K words | $42/mo | Monthly |
Undetectable AI doesn't state a reset schedule on the pages we track.
Quoted from the sources above. Allowance periods are the time words each vendor uses in its limits ("weekly", "five-hour", "per month").
Notes
- Yearly prices were marked '50% off' (sale) on 2026-10-25. The cheapest month-to-month plan is 20K words at $19/month; the 10K plan was shown only with yearly billing. Yearly plans offer a 3-day free trial.
- The pricing page says 'Free Trial is limited to 250 words. Additional usage requires paid plan activation.' The AI Detector page says the detector is free with no signup. We treat the detector as free and the humanizer as a trial.
Undetectable AI price and limit history
No price, limit or free-tier change logged for Undetectable AI yet. The detector checks its pricing pages daily; get an alert when it moves.
Undetectable AI news
No curated Undetectable AI updates yet. We read the official Undetectable AI blog, changelog and status page and log launches, model releases, pricing and limit changes. See what changed across all AI tools.
Compare Undetectable AI
Undetectable AI pricing questions
Is Undetectable AI free?
Yes. Free AI Detector with no signup; the text box takes up to 10,000 words per check (a monthly cap isn't stated). The humanizer's free trial is limited to 250 words.
How much does Undetectable AI cost?
Undetectable AI has 4 paid plans: 10K words $5/mo billed yearly; 20K words $19/mo; 35K words $31/mo; 50K words $42/mo. Cheapest: $5/mo. Checked 2026-10-25.
What are Undetectable AI's usage limits?
10K words: 10,000 words/month; yearly billing only, charged $60/year (sale price; list $9.99/mo). Unlimited AI detecting. 20K words: 20,000 words/month. Yearly charged $114/year (sale price). Unlimited AI detecting. 35K words: 35,000 words/month. Yearly charged $189/year (sale price). Unlimited AI detecting. 50K words: 50,000 words/month. Unlimited AI detecting.
Is Undetectable AI cheaper if you pay yearly?
Yes, up to 50%: 20K words is $9.50/mo billed yearly instead of $19/mo.
Has Undetectable AI's pricing changed recently?
No change is logged for Undetectable AI yet. Prices were last checked 2026-10-25.
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