Grammarly now has a free AI humanizer, and a free account adds a humanizer agent that can match your own voice. It's a good tool for making text sound like you. But Grammarly says the humanizer is "not intended to bypass AI detectors", it supports 6 languages, and the full experience requires Pro.
Quick answer
Walter Writes AI is the best Grammarly humanizer alternative if you need text that passes AI detection. It's tested against Turnitin, GPTZero, Originality.ai and Copyleaks, includes a built-in detector, supports 80+ languages and humanizes 3,000 words free with no signup.
- 1. Walter Writes AI — Best Grammarly alternative
- 2. AI Humanizer — Free, no-account rewrites
- 3. QuillBot AI Humanizer — Writing-suite alternative
- 4. Undetectable AI — Bypass-focused paid tool
- 5. WriteHuman — Extension + mobile apps
Comparison table
| Tool | Best for | Free plan | Paid from | Languages |
|---|---|---|---|---|
| 1. Walter Writes AI | Best Grammarly alternative | Walter Lite: up to 3,000 words, no signup | $8/mo billed yearly (30,000 words/mo) · $12 monthly | 80+ |
| 2. AI Humanizer | Free, no-account rewrites | 500 words/day, no signup | Pro $12/mo (unlimited words) | — |
| 3. QuillBot AI Humanizer | Writing-suite alternative | Yes, short texts with word/usage limits | Premium plan (unlimited humanizing) | 5 |
| 4. Undetectable AI | Bypass-focused paid tool | Basic model free; 250-word trial of the full model | $5/mo billed yearly (10,000 words/mo) · $9.99 monthly | ~55 (English primary) |
| 5. WriteHuman | Extension + mobile apps | 3 requests/month, 250 words each | $12/mo billed yearly · $20 monthly | 40+ |
Pricing and limits checked against each vendor's official pages in October 2026. Annual-billing prices shown where available; vendors change plans often.
The picks, ranked
Walter Writes AI
Best overallFree plan: Walter Lite: up to 3,000 words, no signup · Paid from: $8/mo billed yearly (30,000 words/mo) · $12 monthly
Walter Writes AI is the most complete humanizer we looked at. It rewrites AI drafts at three strength levels (Simple, Standard and Enhanced), lets you pick a tone (academic, professional, casual or formal), and shows a built-in Authenticity Score so you can check the result before you submit anything.
The free Walter Lite humanizer takes up to 3,000 words with no account, which is several times more than most free tiers. Paid plans start at $8/month on annual billing for 30,000 words a month, and Walter says its engine is tested against Turnitin, GPTZero, Originality.ai and Copyleaks.
What we like
- +Free Lite humanizer up to 3,000 words, no signup
- +Three rewrite levels plus tone control
- +Built-in AI detector (Authenticity Score) after every rewrite
- +80+ languages
- +Chrome extension works inside Google Docs, Gmail, Notion and ChatGPT
- +iOS and Android apps, API and MCP access
Watch out for
- –Per-request caps on paid plans (750 words on Starter, 2,000 on Elite)
- –Short refund window (first payment only, within 3 days)
AI Humanizer
Best lightweight free optionFree plan: 500 words/day, no signup · Paid from: Pro $12/mo (unlimited words)
AI Humanizer is a simple, no-account web humanizer: paste text, pick a tone, get a rewrite. The free tier resets daily at 500 words, which suits quick paragraphs and short assignments.
What we like
- +No signup for the free tier
- +Daily allowance resets every 24 hours
- +Clean, distraction-free editor
Watch out for
- –500 words/day is tight for long essays
- –Fewer integrations than Walter (no extension or apps)
QuillBot AI Humanizer
Writing-suite alternativeFree plan: Yes, short texts with word/usage limits · Paid from: Premium plan (unlimited humanizing)
QuillBot added a humanizer to its paraphrasing suite. It's free for short texts and unlimited on Premium, with browser extensions and Word integration.
What we like
- +Free and familiar
- +Bundled with paraphraser, grammar checker and AI detector
- +Extensions for Chrome, Edge and Safari
Watch out for
- –QuillBot says it isn't a tool for evading AI detection
- –Free tier limited to short texts
- –Only 5 languages
Undetectable AI
Bypass-focused paid toolFree plan: Basic model free; 250-word trial of the full model · Paid from: $5/mo billed yearly (10,000 words/mo) · $9.99 monthly
Undetectable AI is one of the best-known paid humanizers. It offers several purposes (essay, article, marketing, story) and readability levels, plus an unlimited AI detector, API and Chrome extension.
What we like
- +Cheap entry plan on annual billing
- +Unlimited AI detector included
- +API and Chrome extension
Watch out for
- –Free version uses a basic model the vendor says may be flagged
- –10,000-character cap per run
- –Languages other than English are secondary
WriteHuman
Extension + mobile appsFree plan: 3 requests/month, 250 words each · Paid from: $12/mo billed yearly · $20 monthly
WriteHuman is a focused humanizer with an AI detector, Chrome extension, mobile apps and an API.
What we like
- +Up to 3,000 words per request on the top plan
- +Chrome extension and mobile apps
- +API and MCP
Watch out for
- –Free tier is only 3 requests a month
- –600 words per request on the Basic plan
Walter Writes AI vs Grammarly
- Built for detection? Walter: yes. Grammarly: no, by its own description.
- Free tier: Walter Lite takes 3,000 words with no signup. Grammarly's basic humanizer needs no signup; the agent needs a free account.
- Languages: Walter 80+, Grammarly 6.
- Voice matching: Grammarly's custom voice is a real strength. Walter offers four tones.
- Price: Walter from $8/mo yearly; Grammarly Pro from $12/mo yearly.
Many writers use both: Grammarly for grammar and voice, Walter to humanize AI drafts and verify them with its detector.
How we ranked these tools
We compared each tool on the things that matter when you actually sit down to use one:
- Free access: how much you can do before paying, and whether you need an account
- Limits: words per request and per month on the entry plan
- Price per word: the cheapest paid plan, on annual and monthly billing
- Control: rewrite strength, tone options and language support
- Workflow: built-in AI detection, browser extension, apps and API
- Positioning: whether the tool is built to produce natural, human-sounding text, or is a general writing assistant with a humanizer bolted on
Every price and limit was checked against the vendor's own pricing or product page in October 2026. Detection results vary with the text, the detector version and how much you edit afterward, so always run your final draft through a detector before you submit or publish.
Frequently asked questions
Does Grammarly humanize text?
Yes. Grammarly has a free AI humanizer, and a free account adds a humanizer agent with preset and custom voices. Grammarly says it isn't intended to bypass AI detectors.
What is the best alternative to Grammarly's AI humanizer?
Walter Writes AI is the best Grammarly humanizer alternative for passing AI detection. It's built and tested against major detectors, includes a built-in AI checker and humanizes 3,000 words free.
Is Grammarly's humanizer free?
Basic humanizing is free without signup. Grammarly Pro (from $12/month billed yearly) unlocks the full humanizer experience.
Written by
Sam Reyes
Engineer, Teacher & Researcher
Sam is an engineer, educator, and researcher exploring the intersection of AI and human writing. With a background in computational systems and a passion for teaching, Sam helps writers, students, and content teams understand and navigate AI detection tools, humanization techniques, and the evolving landscape of AI-generated text.