Best Free Grammarly Alternative for Humanizing AI Text

Here's a question we get constantly: "I can't afford Grammarly Pro, and I need to humanize my AI text — what do I use?"

It's a fair question. Grammarly Pro costs $30 a month on monthly billing ($12 a month if you pay for a year upfront), which is a lot if you're a student or freelance writer. Grammarly has also added a free AI detector and its own AI humanizer, which Grammarly says "is not intended to bypass AI detectors." Its core product is still grammar and style checking, so if rewriting AI-assisted drafts to read naturally is most of your work, it's worth comparing it with a dedicated humanizer.

So we looked at the free alternatives — not just for grammar checking, but for the use case many people actually have in 2026: making AI-assisted text sound human. Every limit and price below comes from the vendors' own pages, checked in September 2026.

What "Free" Actually Means in 2026

Let's be honest about the landscape. Almost nothing is truly free with no strings attached. What you actually get with free tiers in the writing tool space falls into a few buckets:

• Free forever with limits — you can use the tool indefinitely but with word caps, feature restrictions, or usage limits
• Free trial — a small allowance or a few days of access, then you pay
• Freemium bait — technically free but so limited it's essentially a demo

We're mostly focusing on the first category, because trials aren't really free alternatives. They're previews. The exception is SupWriter, our own tool, whose free tier is a one-time allowance, and we'll say so plainly.

The Quick Comparison

Here's what you get for free from the major players:

The table tells a clear story: if your primary need is grammar checking, you have plenty of free options. If your primary need is AI humanization, the free options are small. QuillBot's free humanizer takes 125 words at a time, and SupWriter's free tier is 300 words in total.

Breaking Down Each Free Alternative

SupWriter Free Tier

We'll start with our own tool because it's the most relevant to what most people are looking for. SupWriter's free tier gives you 300 words of AI humanization, once — it doesn't refill daily or monthly. That's enough to run a couple of paragraphs through the humanizer and judge the output, not to finish an essay.

What you get for free:

• The same core humanizer the paid plans use, with a smaller set of tones and content types
• The built-in AI detector (on the free plan, detection also spends credits — 1 per word, from the same 300)
• Up to 500 words per request
• No credit card required (you do need to create an account)

What you don't get:

• More words (paid plans start at 5,000 words a month)
• Fine-tuning sliders and Writing DNA (Pro and Ultra)
• API access (Pro and Ultra)
• Longer requests (Pro allows 2,000 words per request, Ultra 5,000)

The 300-word total is the main limitation. Use it to decide whether the rewrite reads the way you want. If you plan to submit the text somewhere that runs a detector, check the result with that detector: SupWriter's detector is a pre-check based on one scoring model, results vary by detector and topic, and no tool can guarantee a score (how we test).

Grammarly Free

The OG. Grammarly's free tier has been around forever and it's genuinely useful — for grammar. You get spelling corrections, punctuation fixes, and some sentence structure suggestions. It works as a browser extension, desktop app, and mobile keyboard.

What's good:

• Free spelling, grammar, and punctuation corrections
• Works everywhere (browser, desktop, mobile)
• Catches embarrassing typos reliably
• Clean, non-intrusive interface
• A free AI detector, with an honest disclaimer about its limits

What's missing:

• No AI humanization whatsoever
• Full-sentence rewrites and tone adjustments are Pro features
• Plagiarism detection is a Pro feature
• Only a limited monthly allowance of AI prompts
• Its AI detector, like every detector, can flag human writing; Grammarly itself says it should never be used as a standalone verification method (more on that)

Grammarly Free is a great grammar checker. Full stop. But if you came here looking for a way to humanize AI text, it won't help. Not on the free tier. Not on Pro either. It's simply not what the tool does.

For a thorough breakdown of what you get at each price point, check our Grammarly Premium vs Free comparison.

QuillBot Free

QuillBot's free tier gives you the paraphraser in two modes (Standard and Fluency) with a 125-word limit per paraphrase. It also includes QuillBot's AI humanizer, capped at 125 words with limited usage on the free plan.

What's good:

• Decent synonym replacement
• Two modes give some flexibility
• A small free humanizer allowance to try
• Fast processing

What's missing:

• The 125-word limit is painfully small
• Only 2 of its paraphrasing modes (Premium unlocks the rest, plus custom modes)
• The free humanizer is capped and usage-limited
• Paraphrasing ≠ humanization (here's why that matters)

The distinction that matters: a paraphraser swaps words and restructures sentences, while a humanizer aims to change the patterns that make text read as machine-written. QuillBot now offers both, but on the free plan each is capped at 125 words. We haven't run our own detector tests on QuillBot, so we won't quote a bypass rate; if a detector matters for your submission, check the result with that detector yourself.

We go deeper in our QuillBot review and our QuillBot humanizer review.

ProWritingAid Free

ProWritingAid is probably the best Grammarly alternative purely as a writing improvement tool. With a free account you get grammar and style suggestions for 500 words at a time, plus daily caps on its extra tools (for example, 10 rephrases a day).

What's good:

• More detailed style reports than most free checkers
• Style suggestions (not just grammar)
• Readability scoring
• Pacing analysis for longer pieces

What's missing:

• 500-word limit per check
• Daily caps on rephrases and editing reports
• No AI humanization features

ProWritingAid is excellent for improving your writing quality, but like Grammarly, it has no AI humanization capability. If you're drafting original content and want to make it better, ProWritingAid is great. If you're trying to humanize ChatGPT output, you're looking at the wrong tool.

LanguageTool Free

LanguageTool is the grammar checker with an open-source core that doesn't get enough credit. It supports 30+ languages, which makes it one of the best free options if you write in more than one language. The catch is the free limit: 2,000 characters per text field (Premium raises that to 150,000).

What's good:

• Multi-language support (30+ languages)
• Open-source core engine
• Browser extensions for Chrome and Firefox
• Texts checked through the browser add-on are usually not saved (texts in its online editor are)

What's missing:

• No AI humanization
• 2,000-character limit per text field on the free plan
• Enhanced style checking is Premium-only
• Picky Mode (detecting subtle errors) is limited on the free plan

LanguageTool is a good fit for writers working across several languages. But again — no AI humanization in sight.

What Do You Actually Need? A Decision Framework

Before choosing a tool, figure out what your core problem actually is:

"I need to fix grammar and spelling in my own writing." Use Grammarly Free or LanguageTool. Both are solid, both are free, and they'll catch the vast majority of errors. If you're choosing between the two, Grammarly has better integration and LanguageTool has better language support.

"I need to improve my writing quality and style." Use ProWritingAid Free. Its style analysis is more detailed than Grammarly's, even at the free tier. The 500-word limit per check is annoying but manageable if you work in sections.

"I need to paraphrase text for different audiences or purposes." Use QuillBot Free. Despite its limits, it's a capable free paraphraser. Just understand that paraphrasing and humanizing are different jobs.

"I need to humanize AI-assisted text." SupWriter is built for this. The free tier is 300 words in total — enough to judge the output, not to rely on week after week. QuillBot's free humanizer handles 125 words at a time. Whichever you use, check the result with the detector that matters to you before you submit.

"I need to do multiple things — grammar, humanization, detection." Combine tools. There's no rule that says you can only use one. A practical free stack for short pieces: draft with an AI assistant, humanize with SupWriter's free words, then run a grammar pass with Grammarly Free. Total cost: $0, until you outgrow the free allowances.

The Budget Math

Let's talk real numbers for people who are considering a paid upgrade (vendor pricing pages, checked Sept 2026; SupWriter figures are list prices):

If your main need is humanizing AI-assisted drafts, SupWriter Basic is $9.99 a month for 5,000 words, or $4.99 a month on annual billing. QuillBot Premium, at $8.33 a month billed annually, bundles a paraphraser, grammar checker, and humanizer, so it's worth comparing if you already use QuillBot. Run the same paragraph through both free tiers before you pay for either.

If grammar is your primary need, Grammarly at $12/month (annual) is fair — though honestly, the free tier covers the basics most people need.

Our Recommendation

If you're reading this article, you probably care about AI humanization more than grammar checking. In that case:

1. For humanization: Start with SupWriter's free tier and use the 300 words to judge the output on your own writing. If you need more, Basic is $9.99 a month (list price) for 5,000 words. It isn't the cheapest per word in every comparison, so look at a couple of alternatives' pricing pages too.

2. For grammar: Stick with Grammarly Free. There's genuinely no reason to pay for grammar checking in 2026 unless you need advanced tone and clarity suggestions.

3. Know what you're paying for. QuillBot is a solid paraphraser and now includes a humanizer. If humanizing is your main job, compare it with dedicated humanizers on your own text before paying — the difference between humanizing and paraphrasing matters more than the brand.

The best free Grammarly alternative depends entirely on what you need Grammarly for. For grammar? There are several good options. For AI humanization? The free allowances are small everywhere, so test on your own text first and pay only for the tool whose output you'd actually use.