Free
$0forever
No signup. No card. No trial that expires.
- 300 humanizer words a day
- detector checks included
- Subtle, Natural, Strong tones
- All 7 detectors checked
- Multi-pass detector loop
- No signup needed. Ever.
§01PricingSimple pricing.
Simple pricing.
No surprises.
Three plans. No hidden fees. No per-word surcharges. Every plan checks against all 7 detectors and uses the multi-pass correction loop. Pro adds the premium engine on every run, Brand Voice training, side-by-side compare, 8,000-word inputs, and API access.
Most popular
Pro
$9/ month
billed annually at $108
50,000 words a month. Cancel any time, one click.
- 50,000 words a month, up to 8,000 per single run
- Side-by-side compare
- Brand Voice training
- Two-model 2nd-opinion pass
- Searchable run history
- API access
★ Founder · Lifetime
$349$199once
one payment, never billed again
84 of 100 claimed16 left
- 150,000 humanizer words a month, for life
- Up to 8,000 words per single run
- Premium model tier: our most advanced engine on every run
- Every future feature, free, forever
- Permanent Founder badge on your account
- One payment. Never billed again.
3-day refund, no questions asked. See /refund. Card payments are processed by Stripe; we never see your card details. Sales tax or VAT may be added at checkout for card payments, depending on your country.
§02Free vs Pro
Free to start. Premium when it counts.
Every plan gets the three tone strengths (Subtle, Natural, Strong), the multi-pass detector loop, and the 7-detector check at the end of every run, with the 99.6% pass rate measured weekly.
Pro is where the engine gets serious. Every Pro run goes through the premium engine: it writes dozens of rewrites, checks them against GPTZero, keeps the one that reads most human, and automatically runs a second batch when the best one still reads as AI. Free users get it once, as a sample. Pro is also 50,000 words a month with 8,000-word max per run (Free is 300 words a day with 1,500-word max per run), plus Brand Voice training, side-by-side compare, two-model second-opinion pass, searchable run history, and API access. Founder is 150,000 words a month for life with 8,000-word max per run, plus the premium model tier, our most advanced engine with a multi-model second-opinion pass, on every single run.
We built it this way because making you pay to use the basic tool is annoying. 300 words is enough to humanize a full paragraph and see real detector scores, and a free account raises that to 500 a day. If it works for you at that scale, paying for more volume makes sense. If it doesn't, no harm done.
§03Value comparison
Cost per 1,000 words.
| Tool | Monthly cost | Words included | Cost per 1K words |
|---|---|---|---|
| HumanGPT Pro | $19 | 50,000 | $0.38 |
| HumanGPT Founder | $199 once | 150,000 / mo | ~$0 effective |
| Undetectable.ai | $9.99 | 10,000 | $1.00 |
| StealthWriter | $14 | 10–15,000 | $0.93–$1.40 |
| Quillbot Premium | $9.95+ | Unlimited paraphrase, 700-word cap per humanize | N/A (different product) |
| Manual rewriting | $50+/hr | ~1,000/hr | $50.00 |
Verified 2026-05-27 from each tool's public pricing page
How we compare
The lowest-cost humanizer with API access and Brand Voice.
We don't claim to be the only humanizer worth using. We claim to be the one that costs the least, gives you the API for free, and lets you try it with no card and no email.
| Feature | HumanGPT Pro | Undetectable.ai | Quillbot Premium | StealthWriter |
|---|---|---|---|---|
| Price (monthly) | $19 | $9.99 | $9.95+ | $14 |
| Lifetime option | $199 once (100 seats) | — | — | $397 |
| Words per month | 50,000 | 10,000 | Unlimited paraphrase | 10–15,000 |
| Max input per request | 8,000 words | Not disclosed | 700 words | 800 words |
| Two-model 2nd-opinion pass | — | — | — | |
| Brand Voice training | — | — | — | |
| Side-by-side compare | — | — | — | |
| Built-in 7-detector check | 3 detectors | — | — | |
| REST API access | — | — | ||
| Searchable run history | — | — | — | |
| 3-day refund, no questions | Conditional (flagged-output only) | Not stated | Not stated | |
| No signup to try | Email required | Email required | Email required |
Price (monthly)
- HumanGPT
- $19
- Undetectable.ai
- $9.99
- Quillbot
- $9.95+
- StealthWriter
- $14
Lifetime option
- HumanGPT
- $199 once (100 seats)
- Undetectable.ai
- —
- Quillbot
- —
- StealthWriter
- $397
Words per month
- HumanGPT
- 50,000
- Undetectable.ai
- 10,000
- Quillbot
- Unlimited paraphrase
- StealthWriter
- 10–15,000
Max input per request
- HumanGPT
- 8,000 words
- Undetectable.ai
- Not disclosed
- Quillbot
- 700 words
- StealthWriter
- 800 words
Two-model 2nd-opinion pass
- HumanGPT
- Undetectable.ai
- —
- Quillbot
- —
- StealthWriter
- —
Brand Voice training
- HumanGPT
- Undetectable.ai
- —
- Quillbot
- —
- StealthWriter
- —
Side-by-side compare
- HumanGPT
- Undetectable.ai
- —
- Quillbot
- —
- StealthWriter
- —
Built-in 7-detector check
- HumanGPT
- Undetectable.ai
- 3 detectors
- Quillbot
- —
- StealthWriter
- —
REST API access
- HumanGPT
- Undetectable.ai
- Quillbot
- —
- StealthWriter
- —
Searchable run history
- HumanGPT
- Undetectable.ai
- —
- Quillbot
- —
- StealthWriter
- —
3-day refund, no questions
- HumanGPT
- Undetectable.ai
- Conditional (flagged-output only)
- Quillbot
- Not stated
- StealthWriter
- Not stated
No signup to try
- HumanGPT
- Undetectable.ai
- Email required
- Quillbot
- Email required
- StealthWriter
- Email required
Prices and features verified 2026-05-27 from each competitor's public pricing page. Refreshed monthly.
§04QuestionsPricing FAQ.
Pricing FAQ.
No fine print.
Yes. 300 humanizer words per day, no signup, no credit card. Just paste text and humanize. The free tier gets the three tone strengths (Subtle, Natural, Strong), the multi-pass detector loop, and the 7-detector consensus check, with 300 words a day and 1,500 words per single run. Pro adds the premium engine on every run, 50,000 words a month and 8,000-word runs.
Input words. If you paste 150 words, that's 150 words from your daily or monthly quota. The output might be slightly longer or shorter depending on the humanization mode, but only input words are counted.
Yes. No contracts, no cancellation fees. Cancel through your dashboard or email us. Your access continues until the end of the billing period.
Founder includes 150,000 humanizer words every month, for life. That is three times the Pro allowance and roughly thirty-six times what our heaviest Founder actually uses, so in practice it never binds. It renews every month forever on a single payment.
The free tier is designed for student budgets. 300 words/day covers most homework paragraphs. For full essays, Pro is $19 a month, or $9 a month billed annually ($108 a year).
Not yet. Pro accounts work well for small teams. For enterprise needs (API access, volume pricing, dedicated support), email us at [email protected].
Credit and debit cards, Apple Pay, Google Pay and Link (all processed by Stripe), plus PayPal. Both options are on every paid plan. We never see or store your card details.
Yes. The Founders Edition Lifetime plan is capped at 100 total seats ever. Once they're gone, the only options are Free and Pro. We won't create another lifetime tier.
★ bottom line
Free to try. $19 a month to scale. $199 to never think about it again. Every plan includes every feature.
Try free now