Side-by-side comparison · Writing & Translation
Grammarly vs Originality.ai 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: Anyone who writes emails, documents and messages at work and wants mistakes caught and tone checked before they hit send.
Pick it if: Publishers, content agencies, SEO teams and businesses that commission written content and want to check it before publishing.
Pick it if: Authors, bloggers and anyone writing long documents who wants detailed feedback on style as well as typos.
Overview
| Attribute | Grammarly | Originality.ai | ProWritingAid |
|---|---|---|---|
| In one line | Fixes grammar, clarity and tone in your writing, wherever you type. | Checks content for AI writing, plagiarism and factual errors before you publish it. | Grammar and style checker for authors, with in-depth reports on long manuscripts. |
| Pricing model | Freemium | Freemium | Freemium |
| Starting price | $12/member/mo | $14.95/mo | $0 |
| Free plan | Yes | Yes | Yes |
| Works with Claude Code | No | Yes | No |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | Grammarly | Originality.ai | ProWritingAid |
|---|---|---|---|
| Overall rating | 4.3Winner | 4.1 | 3.9 |
| Ease of useHow quickly someone non-technical gets value from it. | 5.0 | 4.0 | 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. | 4.0 | 3.5 | 4.0 |
| 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. | 4.5 | 4.5 | 3.5 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | Grammarly | Originality.ai | ProWritingAid |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | Yes |
| Mobile app | 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 | – | – | – |
| Capabilities score | 8/ 17 | 7/ 17 | 6/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Grammarly | Originality.ai | ProWritingAid |
|---|---|---|---|
| Plans | Free Free Basic spelling and grammar checks. | Free Free Checking the odd article. | Free $0 Trying the reports on short pieces. |
ProOur pick $12/member/mo billed yearly, or about $30 monthly Anyone who writes a lot at work, alone or in a team. | ProOur pick $14.95/mo, or $12.95/mo billed yearly Agencies and site owners checking content every week. | PremiumOur pick $30/mo, or $10/mo billed yearly ($120) Writers editing regularly. | |
Enterprise Custom Large organisations with security needs. | Enterprise $179/mo, or $136.58/mo billed yearly Publishers and large content teams. | Premium Pro $36/mo, or $12/mo billed yearly ($144) Authors who want feedback and a community. | |
| Which plan to pick | 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. | Pro is enough for most agencies and site owners. An AI and plagiarism check together uses two credits per 100 words, so budget about 100,000 words of checked content a month. Go Enterprise only if you need the API or very high volume. | 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 | Grammarly | Originality.ai | ProWritingAid |
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Pros and cons
| Attribute | Grammarly | Originality.ai | ProWritingAid |
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Who each one is for
| Attribute | Grammarly | Originality.ai | ProWritingAid |
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Questions people ask
Which is better, Grammarly, Originality.ai or ProWritingAid?
Grammarly scores highest overall in our ratings (Grammarly 4.3/5, Originality.ai 4.1/5 and ProWritingAid 3.9/5). Grammarly is best for proofreading emails and documents as you type and checking tone before a tricky message goes out. Originality.ai is best for checking freelance and agency content and AI and plagiarism checks in one scan. ProWritingAid is best for editing a novel or long manuscript and finding repeated words and clunky sentences.
Which is cheaper, Grammarly, Originality.ai or ProWritingAid?
Grammarly: There's a free plan, and paid plans start at $12/member/mo. Originality.ai: There's a free plan, and paid plans start at $14.95/mo. ProWritingAid: There's a free plan, and paid plans start at $0.
Which is easier to use, Grammarly, Originality.ai 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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