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QuillBot alternative, what Premium costs, and when a dedicated humanizer is the better buy
Most people looking for a QuillBot alternative are not unhappy with QuillBot. They reached for it to paraphrase, then found they also needed the output to read as human, and they are working out whether one $99.95 subscription covers both jobs or whether they are paying suite prices for a feature they use once a week.
QuillBot is an excellent writing and paraphrasing suite and the free tier is unusually generous for what it is. The question worth answering is narrower: paraphrasing swaps words inside a sentence, and the rhythm and predictability of the prose stay roughly where they started. Undetected.ai rewrites for those properties, keeps your meaning, and shows our own AI-pattern score before and after with the reasons behind each number, so you read what changed instead of taking a status message on trust.
Meaning kept · Your own text rewritten · Saved to your history, delete any time
The short answer
QuillBot Premium costs $19.95 a month, or $8.33 a month billed as $99.95 once a year, read on QuillBot's own pages on September 17, 2026. That buys a nine-tool writing suite rather than a humanizer. If humanizing is the job you actually need done at volume, a dedicated tool costs more a month but gives you a published word pool: Undetected.ai is $24 a month billed yearly for 100,000 words across 300 runs, which is $0.24 per 1,000 words, and it shows our AI-pattern score before and after with the reasons behind it. Stay with QuillBot if paraphrasing, grammar and citations are the bulk of your work.
Both tools are capable; the differences below are what actually decide it.
QuillBot is a great all-round paraphrasing and writing suite; Undetected.ai is built specifically to humanize AI text, with a visible score for the draft and the rewrite.
Prices we read ourselves
What QuillBot costs, and what we cost
Read off each vendor's own pricing page on the date shown, not copied from a roundup. Where the yearly rate is cheaper we lead with it, because that is the number buyers compare.
| Undetected.ai | QuillBot | |
|---|---|---|
| Cheapest paid plan | $24/mo billed yearly ($49 monthly) | $8.33/mo billed yearly ($99.95 once a year). $19.95 paying monthly, or $13.31/mo on the plan QuillBot bills every three months at $39.95 |
| What that carries | 100,000 words/mo across 300 runs, 1,500 words a run | Unlimited paraphrasing on Premium, and its humanizer page states no word or usage limit there. The free tier caps each paraphrase at 125 words and gives 125 words of humanizing across 6 uses a day |
| Try it before paying | Trial: 3 runs of up to 300 words, once. No free plan. | No paid trial. There is a permanent free tier at the caps above, and Premium can be paused rather than cancelled |
| Where they win | One pass over your own text, with our AI-pattern score and its reasons | A genuine writing suite: paraphrasing modes, grammar checking, a plagiarism checker, citation tools and, since 2026, its own AI detector and AI humanizer in the same subscription. Its humanizer page still makes no promise about any named detector, which is more restrained than most of this category |
QuillBot pricing read September 17, 2026. All figures in USD. Promotional rates move constantly, so confirm on the vendor's own page before you buy. We build one of these tools.
Not sure any of them do what they claim? We published the ten-minute test for whether an AI humanizer actually works, which costs nothing and settles it on your own writing.
Side by side
Undetected.ai vs QuillBot, honestly
A fair look at what each does well. Both are capable tools. Here is where they differ.
| What matters | Undetected.ai | QuillBot |
|---|---|---|
| What you are buying | One job: rewriting AI-shaped prose into natural prose, with a score you can read | A writing suite: paraphraser, grammar, plagiarism check, citations, detector and humanizer |
| Price at entry | $24/mo billed yearly, $49 monthly. 100,000 words and 300 runs a month | $8.33/mo billed as $99.95 a year, or $19.95 monthly. Unlimited paraphrasing on Premium |
| What the free tier gives you | Trial: 3 runs of up to 300 words, once. No free plan | A permanent free tier, capped at 125 words per paraphrase and 125 words of humanizing over 6 uses a day |
| Our AI-pattern score | Animated score on your draft and on the rewrite, with what earned each number | Ships its own AI detector as a separate tool in the suite |
| Meaning preserved | Rewrites rhythm and structure while keeping facts and argument intact | Strong at meaning-aware paraphrasing across several modes |
| Best suited for | Writers whose main recurring job is the humanize step | Anyone who needs paraphrasing, grammar and citation help every day |
Comparison reflects general, publicly understood positioning. Capabilities change, so check each product for the latest.
Want the full head-to-head with verified pricing tables? Read QuillBot vs Undetected AI.
Why writers pick Undetected.ai
The humanizer that shows its work
One job, done well
Undetected.ai is built around the rewrite, so it works on the rhythm and predictability of the prose rather than swapping synonyms inside a sentence that keeps its shape.
See the score, not just the text
Our own AI-pattern score, measured before and after with its reasons, is something a general paraphraser does not put in front of you.
Pay for what you use
A suite subscription is good value when you use the suite. If the humanizer is the only tool you open, $99.95 a year buys eight features you are not touching.
Good questions
QuillBot vs Undetected.ai, answered
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Further reading: QuillBot AI humanizer: word limits, price and alternatives · QuillBot pricing: what Premium costs and every free cap · Smodin review: the other bundle students compare QuillBot against · What the cheapest AI humanizer actually costs per word · Can AI detectors detect paraphrasing?
Try Undetected.ai on your own text
Paste your own text and read the rewrite next to the original, with our AI-pattern score measured on both before you copy.
Meaning kept · Your own text rewritten · Saved to your history, delete any time