Side-by-side comparison · Writing & Translation
GPTZero vs Grammarly 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: Teachers, editors and business owners who want a second opinion on whether writing they've been handed came from AI.
Pick it if: Anyone who writes emails, documents and messages at work and wants mistakes caught and tone checked before they hit send.
Pick it if: Students, non-native English writers and anyone who wants a paragraph cleaned up or reworded in one click.
Overview
| Attribute | GPTZero | Grammarly | QuillBot |
|---|---|---|---|
| In one line | Checks whether text was written by AI, with plagiarism and citation checks too. | Fixes grammar, clarity and tone in your writing, wherever you type. | Rewords, fixes grammar and summarises text, with an AI checker and humaniser built in. |
| Pricing model | Freemium | Freemium | Freemium |
| Starting price | $0 | $12/member/mo | $19.95/mo |
| Free plan | Yes | Yes | Yes |
| Works with Claude Code | Yes | No | No |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | GPTZero | Grammarly | QuillBot |
|---|---|---|---|
| Overall rating | 4.2 | 4.3Winner | 4.1 |
| Ease of useHow quickly someone non-technical gets value from it. | 4.5 | 5.0 | 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 | 4.0 | 3.5 |
| Value for moneyWhat you get for the price, including the free plan. | 4.0 | 3.5 | 4.0 |
| Speed & reliabilityHow fast it is and how often it falls over. | 4.5 | 4.5 | 4.0 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | GPTZero | Grammarly | QuillBot |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | Yes |
| Mobile app | No | Yes | Yes |
| Desktop app | – | Yes | Yes |
| Browser extension | Yes | Yes | Yes |
| API access | 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 | No | No | No |
| AI abilities | |||
| Works with your files | Yes | – | Yes |
| Understands images | – | – | No |
| Makes images | No | No | – |
| Makes video | No | No | No |
| Writes code | No | No | No |
| Runs agents or automations | No | – | No |
| Learns your brand or style | – | Yes | Yes |
| Works in many languages | Yes | – | Yes |
| Capabilities score | 8/ 17 | 8/ 17 | 9/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | GPTZero | Grammarly | QuillBot |
|---|---|---|---|
| Plans | Free $0 Checking the odd document. | Free Free Basic spelling and grammar checks. | Free Free Odd sentences and quick grammar checks. |
PremiumOur pick $23.99/mo, or $12.99/mo billed yearly Teachers and editors checking work every week. | ProOur pick $12/member/mo billed yearly, or about $30 monthly Anyone who writes a lot at work, alone or in a team. | PremiumOur pick $19.95/mo, or $99.95/yr ($8.33/mo) Anyone rewording or checking text most weeks. | |
Professional $45.99/mo, or $24.99/mo billed yearly Agencies and heavy users scanning lots of files. | Enterprise Custom Large organisations with security needs. | Team Per seat, billed yearly Schools and companies buying for a group. | |
Team Professional price per seat, 2 seats minimum Schools and businesses buying for a group. | |||
| Which plan to pick | 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. | Free is enough for typo-catching. If you write for clients or customers every day, Pro on yearly billing is good value; paying monthly costs more than double. | 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 | GPTZero | Grammarly | QuillBot |
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Pros and cons
| Attribute | GPTZero | Grammarly | QuillBot |
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Who each one is for
| Attribute | GPTZero | Grammarly | QuillBot |
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Questions people ask
Which is better, GPTZero, Grammarly or QuillBot?
Grammarly scores highest overall in our ratings (GPTZero 4.2/5, Grammarly 4.3/5 and QuillBot 4.1/5). GPTZero is best for checking essays and assignments for AI writing and screening freelance or agency content. Grammarly is best for proofreading emails and documents as you type and checking tone before a tricky message goes out. QuillBot is best for rewording a sentence or paragraph and grammar and spelling fixes.
Which is cheaper, GPTZero, Grammarly or QuillBot?
GPTZero: There's a free plan, and paid plans start at $0. Grammarly: There's a free plan, and paid plans start at $12/member/mo. QuillBot: There's a free plan, and paid plans start at $19.95/mo.
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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