Side-by-side comparison · Writing & Translation
Copyleaks vs GPTZero vs QuillBot
Everything that matters when choosing between them, in one place: our rating, what each can do, what they cost, and the trade-offs.
Comparing 3 tools, the maximum.
At a glance
Pick it if: Schools, publishers and businesses that need AI and plagiarism checks together, especially across several languages.
Pick it if: Teachers, editors and business owners who want a second opinion on whether writing they've been handed came from AI.
Pick it if: Students, non-native English writers and anyone who wants a paragraph cleaned up or reworded in one click.
Overview
| Attribute | Copyleaks | GPTZero | QuillBot |
|---|---|---|---|
| In one line | Checks text for AI writing and plagiarism in one scan, in over 30 languages. | Checks whether text was written by AI, with plagiarism and citation checks too. | Rewords, fixes grammar and summarises text, with an AI checker and humaniser built in. |
| Pricing model | Freemium | Freemium | Freemium |
| Starting price | $0 | $0 | $19.95/mo |
| Free plan | Yes | Yes | Yes |
| Works with Claude Code | Yes | Yes | No |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | Copyleaks | GPTZero | QuillBot |
|---|---|---|---|
| Overall rating | 3.9 | 4.2Winner | 4.1 |
| Ease of useHow quickly someone non-technical gets value from it. | 4.0 | 4.5 | 5.0 |
| FeaturesHow completely it covers its own job, and how well the pieces fit together. | 4.5 | 4.5 | 4.0 |
| Output qualityHow good the results are before you fix them. | 3.5 | 3.5 | 3.5 |
| Value for moneyWhat you get for the price, including the free plan. | 3.5 | 4.0 | 4.0 |
| Speed & reliabilityHow fast it is and how often it falls over. | 4.0 | 4.5 | 4.0 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | Copyleaks | GPTZero | QuillBot |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | Yes |
| Mobile app | No | No | Yes |
| Desktop app | – | – | Yes |
| Browser extension | Yes | Yes | Yes |
| API access | Yes | Yes | No |
| Teams & business | |||
| Team workspace | Yes | Yes | Yes |
| Enterprise plan or SSO | Yes | Yes | – |
| Connects to other apps | Yes | Yes | Yes |
| Open source or self-hosted | Yes | No | No |
| AI abilities | |||
| Works with your files | Yes | Yes | Yes |
| Understands images | Yes | – | No |
| Makes images | No | No | – |
| Makes video | No | No | No |
| Writes code | No | No | No |
| Runs agents or automations | No | No | No |
| Learns your brand or style | – | – | Yes |
| Works in many languages | Yes | Yes | Yes |
| Capabilities score | 10/ 17 | 8/ 17 | 9/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Copyleaks | GPTZero | QuillBot |
|---|---|---|---|
| Plans | Free $0 Quick one-off checks. | Free $0 Checking the odd document. | Free Free Odd sentences and quick grammar checks. |
PersonalOur pick $16.99/mo, or $13.99/mo billed yearly Individuals checking work regularly. | PremiumOur pick $23.99/mo, or $12.99/mo billed yearly Teachers and editors checking work every week. | PremiumOur pick $19.95/mo, or $99.95/yr ($8.33/mo) Anyone rewording or checking text most weeks. | |
Pro $99.99/mo, or $74.99/mo billed yearly Teams and agencies. | Professional $45.99/mo, or $24.99/mo billed yearly Agencies and heavy users scanning lots of files. | Team Per seat, billed yearly Schools and companies buying for a group. | |
Enterprise and Education Custom Companies and schools at scale. | Team Professional price per seat, 2 seats minimum Schools and businesses buying for a group. | ||
| Which plan to pick | Try the free checker first. Personal covers about 100 pages a month, which suits most individuals. Only move to Pro if a team needs seats or you want website scans. One credit covers 250 words or one image. | Start on Free. If you check more than a few documents a week, Premium on yearly billing is the sweet spot. Professional only makes sense if you scan big batches of files. | Stay on Free if you only reword the odd sentence. If you use it every week, the yearly Premium plan is far cheaper than paying monthly, but set a reminder before it renews because refunds after renewal are hard to get. |
Key features
| Attribute | Copyleaks | GPTZero | QuillBot |
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Pros and cons
| Attribute | Copyleaks | GPTZero | QuillBot |
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Who each one is for
| Attribute | Copyleaks | GPTZero | QuillBot |
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Questions people ask
Which is better, Copyleaks, GPTZero or QuillBot?
GPTZero scores highest overall in our ratings (Copyleaks 3.9/5, GPTZero 4.2/5 and QuillBot 4.1/5). Copyleaks is best for AI and plagiarism checks in one report and checking content in languages other than English. GPTZero is best for checking essays and assignments for AI writing and screening freelance or agency content. QuillBot is best for rewording a sentence or paragraph and grammar and spelling fixes.
Which is cheaper, Copyleaks, GPTZero or QuillBot?
Copyleaks: There's a free plan, and paid plans start at $0. GPTZero: There's a free plan, and paid plans start at $0. QuillBot: There's a free plan, and paid plans start at $19.95/mo.
Which is easier to use, Copyleaks, GPTZero or QuillBot?
QuillBot rates highest for ease of use in our scores. Students, non-native English writers and anyone who wants a paragraph cleaned up or reworded in one click.
How we compare
Ratings are our own, from using each tool, across ease of use, features, output quality, value for money, speed & reliability.
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