Free works. Pro is $10. Founders is $99, once.
Three plans, no hidden fees, no per-word surcharges. Every plan runs the same humanizer engine, the same multi-pass detector loop, and the same strength settings. Pro adds volume, 8,000-word inputs, Brand Voice training and API access. Founders is unlimited for life.
Free
For a paragraph a day. Paste, humanize, copy. No account, no card, no watermark.
- 200 humanizer words a day
- No signup, no credit card
- Light, Medium, Heavy strengths
- 10 voice profiles, 4 reading levels
- Multi-pass detector loop
- Up to 1,500 words per run
- Works in 30+ languages
No email. No trial clock. Free stays free.
Pro
For students with several essays a week, a thesis in progress, or client work that keeps getting flagged.
- 50,000 humanizer words a month
- Up to 8,000 words per single run
- Brand Voice training
- Side-by-side compare
- Two-model 2nd-opinion pass
- Searchable run history + API access
- 3-day refund, cancel in one click
Checkout on HumanGPT.io · PayPal · one account for both sites
Founders
One payment, never billed again. For anyone who will still be writing in 2028.
- Unlimited humanizer words, for life
- Up to 8,000 words per single run
- Premium model tier: our most advanced engine
- Everything in Pro included
- Every future feature, free
- Permanent Founder badge
- Capped at 100 seats, ever
3-day refund, no questions asked.
Pro and Founders are sold and billed by HumanGPT.io, our sister product. Same engine, same plans, same prices, one account that works on both sites. Payments are processed by PayPal. We never see your card number.
Volume and depth. Not the engine.
Free is 200 words a day with a 1,500-word maximum per run. Pro is 50,000 words a month with an 8,000-word maximum per run, plus Brand Voice training, side-by-side compare, a two-model second-opinion pass, searchable run history, and API access. Founders is unlimited words for life with the same 8,000-word maximum 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. 200 words is enough to humanize a full paragraph and see real detector scores. If it works for you at that scale, paying for more volume makes sense. If it doesn't, no harm done.
What you won't find here
- No "Starter" or "Lite" tier. Those are usually the free tier behind a signup wall.
- No "Team" or "Enterprise" tier. Businesses integrate through the Pro API.
- No watermark on free output. Your text is yours.
- No trial clock. Free is free forever, Pro cancels in one click, Founders is paid once.
Cost per 1,000 words.
Prices verified 2026-05-27 from each tool's public pricing page. Founders is a one-time payment, so its effective cost per word trends to zero.
| Tool | Monthly cost | Words included | Cost per 1K words |
|---|---|---|---|
| ByGPT / HumanGPT Pro | $10 | 50,000 | $0.20 |
| ByGPT / HumanGPT Founders | $99 once | Unlimited | ~$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 |
Straight answers before you pay.
Try it on 200 words right now.
No account, no card. If the free tier does the job, keep using it. If you need more, Pro and Founders are one click away.