Best free AI humanizers: what each free plan allows (Oct 2026)
3 of the 5 AI humanizers we track have a permanent free plan. Every $0 allowance below is quoted from the vendor.
Short answer
Top free plans: QuillBot: Free plan humanizes up to 100 words at a time, with limited usage; WriteHuman: 3 humanizer requests per month, up to 250 words per request; Grammarly: Grammarly's AI Humanizer page says 'It's free' with a free Grammarly account.
- 01QuillBotFree plan$0
Free plan humanizes up to 100 words at a time, with limited usage. Upgrade: Premium $19.95/mo.
Try QuillBot (opens in new tab)Official site · quillbot.com - 02WriteHumanFree plan$0
3 humanizer requests per month, up to 250 words per request. Upgrade: Basic $20/mo.
Try WriteHuman (opens in new tab)Official site · writehuman.ai - 03GrammarlyFree plan$0
Grammarly's AI Humanizer page says 'It's free' with a free Grammarly account. Upgrade: Pro $12/mo.
Try Grammarly (opens in new tab)Official site · grammarly.com
Vendor-stated, checked . Full ranking, limits and sources below.
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We re-check every vendor's pricing page daily. The weekly digest lists each verified price, limit or free-tier change, with its source.
Free AI humanizers
| Tool | Upgrade | Free | Status | What you get for $0 & source |
|---|---|---|---|---|
| Free plans | ||||
| Cheapest upgrade Premium · $19.95/mo | $0 | Free tier Allowance stated |
Free plan humanizes up to 100 words at a time, with limited usage; Premium gives full access. Source: quillbot.com (opens in new tab) · checked 2026-10-27 | |
| Cheapest upgrade Basic · $20/mo | $0 | Free tier Allowance stated |
Free: 3 humanizer requests per month, up to 250 words per request. Source: writehuman.ai (opens in new tab) · checked 2026-10-22 | |
| Cheapest upgrade Pro · $12/mo | $0 | Free tier | Grammarly's AI Humanizer page says 'It's free' with a free Grammarly account; usage limits are not stated there. Source: grammarly.com (opens in new tab) · checked 2026-10-16 | |
| Trial only | ||||
—Undetectable AITry Undetectable AI (opens in new tab)Affiliate link: we may earn a commission |
Cheapest upgrade 20K words · $19/mo | — | Trial only | No free plan; the free trial is limited to 250 words, then a paid plan is required. Source: undetectable.ai (opens in new tab) · checked 2026-10-25 |
| No free plan listed | ||||
| Cheapest upgrade Pro · $14.99/mo | — | Free tier unclear | The humanizer is listed on paid plans; the free plan's humanizer access is not stated. Source: zerogpt.com (opens in new tab) · checked 2026-10-22 | |
Compare the top 3 plans side by side Models, limits, resets and what happens at the cap, in one table.
Who should pick what
- You rewrite short passages now and then: QuillBot. QuillBot: Free plan humanizes up to 100 words at a time, with limited usage; Premium gives full access.
- You want a dedicated humanizer with a stated free quota: WriteHuman. WriteHuman: 3 humanizer requests per month, up to 250 words per request. Basic is $20/mo month to month or $12/mo billed yearly.
- You already write in Grammarly: Grammarly. Grammarly's AI Humanizer page says 'It's free' with a free Grammarly account; usage limits are not stated there.
- You'll pay for a dedicated humanizer with a word quota: Undetectable AI. Undetectable AI's free trial is 250 words. The cheapest plan is 10,000 words a month at $5/mo billed yearly ($60/year at the current sale price); month to month starts at $19/mo for 20,000 words.
- You also want an AI detector in the same subscription: QuillBot / ZeroGPT. QuillBot Premium is $19.95/mo month to month or $8.33/mo billed yearly and includes full AI Detector access. ZeroGPT lists its humanizer on paid plans from $14.99/mo.
Next steps
How this list is ranked
Free plans that put a number on the allowance (credits, minutes, images, messages) rank first, because you can plan around a number; free plans with unpublished allowances follow. Within each group, order follows our main price table. Trials and paid-only tools are listed after the ranking so you know they were checked.
About the order (checked 2026-10-25): QuillBot and WriteHuman state free humanizer limits. Grammarly says its humanizer is free but gives no limit. Undetectable AI is a trial, not a free plan: its pricing page says the free trial is limited to 250 words, then you need a paid plan.
We never rank on reviews, affiliate deals or sponsorship. Facts are vendor-stated; "not published" means the vendor doesn't say.
Recent changes in this list
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correctionCorrectionQuillBot Premium price corrected to $19.95 (we had listed $23.95)
Our data listed QuillBot Premium at $23.95 a month. QuillBot's Premium page reads '$19.95 USD Per month' in our saved copies from 2026-10-22, 2026-10-23 and 2026-10-27, so we corrected the figure. This fixes our own error; QuillBot did not change its price. The $8.33 billed-annually figure was already correct.
Questions people ask
What is the cheapest AI humanizer?
Grammarly: Grammarly Pro costs $12/mo. Next cheapest: ZeroGPT ($14.99/mo), Undetectable AI ($19/mo), QuillBot ($19.95/mo). Prices checked 2026-10-16.
Which AI humanizers have a free plan?
QuillBot, WriteHuman, Grammarly. Not free: Undetectable AI (trial only), ZeroGPT (none listed).
Which free AI humanizer tells you exactly what you get?
QuillBot: Free plan humanizes up to 100 words at a time, with limited usage; Premium gives full access.; WriteHuman: Free: 3 humanizer requests per month, up to 250 words per request.
How current is this ranking?
It is rebuilt from our data every time prices are checked; the last check was 2026-10-16. Every price links to the vendor page it came from.