Side-by-side comparison · Writing & Translation
Grammarly vs Originality.ai vs Sudowrite
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: Novelists, self-published authors and hobby fiction writers who want help planning and drafting a long story.
Grammarly scores highest overall, but Originality.ai gives you more for your money. Which one is right comes down to what you value most.
Overview
| Attribute | Grammarly | Originality.ai | Sudowrite |
|---|---|---|---|
| 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. | A writing app for novelists that plans, drafts and edits fiction in your style. |
| Pricing model | Freemium | Freemium | Paid |
| Starting price | $12/member/mo | $14.95/mo | $10/mo |
| Free plan | Yes | Yes | No |
| 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 | Sudowrite |
|---|---|---|---|
| Overall rating | 4.3Winner | 4.1 | 3.6 |
| 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 | 3.5 |
| Value for moneyWhat you get for the price, including the free plan. | 3.5 | 4.0 | 3.0 |
| 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 | Sudowrite |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | No |
| Mobile app | Yes | – | No |
| Desktop app | Yes | – | No |
| Browser extension | Yes | Yes | No |
| API access | – | Yes | No |
| Teams & business | |||
| Team workspace | Yes | Yes | No |
| Enterprise plan or SSO | Yes | Yes | No |
| Connects to other apps | Yes | Yes | No |
| Open source or self-hosted | No | No | No |
| AI abilities | |||
| Works with your files | – | Yes | Yes |
| Understands images | – | – | No |
| Makes images | No | No | Yes |
| 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 | 3/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Grammarly | Originality.ai | Sudowrite |
|---|---|---|---|
| Plans | Free Free Basic spelling and grammar checks. | Free Free Checking the odd article. | Hobby & Student $10/mo billed yearly Writing for fun or for class. |
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. | ProfessionalOur pick $22/mo billed yearly Writing a full novel or screenplay. | |
Enterprise Custom Large organisations with security needs. | Enterprise $179/mo, or $136.58/mo billed yearly Publishers and large content teams. | Max $44/mo billed yearly Authors publishing several books a year. | |
| 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. | Use the free trial on a real chapter first. If you're drafting a full book, Professional is where most novelists land; only move to Max if you're running out of credits every month. |
Key features
| Attribute | Grammarly | Originality.ai | Sudowrite |
|---|---|---|---|
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Pros and cons
| Attribute | Grammarly | Originality.ai | Sudowrite |
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Who each one is for
| Attribute | Grammarly | Originality.ai | Sudowrite |
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Questions people ask
Which is better, Grammarly, Originality.ai or Sudowrite?
Grammarly scores highest overall in our ratings (Grammarly 4.3/5, Originality.ai 4.1/5 and Sudowrite 3.6/5). 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. Sudowrite is best for outlining a novel from an idea and getting past a stuck scene.
Which is cheaper, Grammarly, Originality.ai or Sudowrite?
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. Sudowrite: There's no free plan. Paid plans start at $10/mo.
Which is easier to use, Grammarly, Originality.ai or Sudowrite?
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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