Side-by-side comparison · Writing & Translation
GPTZero vs Grammarly vs ProWritingAid
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: Authors, bloggers and anyone writing long documents who wants detailed feedback on style as well as typos.
Overview
| Attribute | GPTZero | Grammarly | ProWritingAid |
|---|---|---|---|
| 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. | Grammar and style checker for authors, with in-depth reports on long manuscripts. |
| Pricing model | Freemium | Freemium | Freemium |
| Starting price | $0 | $12/member/mo | $0 |
| 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 | ProWritingAid |
|---|---|---|---|
| Overall rating | 4.2 | 4.3Winner | 3.9 |
| Ease of useHow quickly someone non-technical gets value from it. | 4.5 | 5.0 | 3.5 |
| FeaturesHow completely it covers its own job, and how well the pieces fit together. | 4.5 | 4.5 | 4.5 |
| Output qualityHow good the results are before you fix them. | 3.5 | 4.0 | 4.0 |
| 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 | 3.5 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | GPTZero | Grammarly | ProWritingAid |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | Yes |
| Mobile app | No | Yes | No |
| Desktop app | – | Yes | Yes |
| Browser extension | Yes | Yes | Yes |
| API access | Yes | – | – |
| Teams & business | |||
| Team workspace | Yes | Yes | No |
| 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 | – | – | – |
| Makes images | No | 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 | – | – |
| Capabilities score | 8/ 17 | 8/ 17 | 6/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | GPTZero | Grammarly | ProWritingAid |
|---|---|---|---|
| Plans | Free $0 Checking the odd document. | Free Free Basic spelling and grammar checks. | Free $0 Trying the reports on short pieces. |
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 $30/mo, or $10/mo billed yearly ($120) Writers editing regularly. | |
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. | Premium Pro $36/mo, or $12/mo billed yearly ($144) Authors who want feedback and a community. | |
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. | Try Free on a chapter or a long blog post. If it clicks, Premium on yearly billing is good value, and the lifetime deal pays off after about three years. Premium Pro is for authors who want daily critiques and the workshops. |
Key features
| Attribute | GPTZero | Grammarly | ProWritingAid |
|---|---|---|---|
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Pros and cons
| Attribute | GPTZero | Grammarly | ProWritingAid |
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Who each one is for
| Attribute | GPTZero | Grammarly | ProWritingAid |
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Questions people ask
Which is better, GPTZero, Grammarly or ProWritingAid?
Grammarly scores highest overall in our ratings (GPTZero 4.2/5, Grammarly 4.3/5 and ProWritingAid 3.9/5). 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. ProWritingAid is best for editing a novel or long manuscript and finding repeated words and clunky sentences.
Which is cheaper, GPTZero, Grammarly or ProWritingAid?
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. ProWritingAid: There's a free plan, and paid plans start at $0.
Which is easier to use, GPTZero, Grammarly or ProWritingAid?
Grammarly rates highest for ease of use in our scores. Anyone who writes emails, documents and messages at work and wants mistakes caught and tone checked before they hit send.
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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