Grammarly vs Originality.AI
Side-by-side comparison of features, pricing, and ratings
At a glance
| Dimension | Grammarly | Originality.AI |
|---|---|---|
| Best for | Polishing everyday writing for grammar, clarity, and tone across apps and websites | Detecting AI-generated content and ensuring content integrity for web publishers |
| Pricing | Free tier available; Premium at $12/mo; Business at $15/user/mo | No free tier; Pay As You Go at $30; Pro Plan at $14.95/mo; Enterprise at $179/mo; usage-based credits |
| Setup complexity | Very low: browser extension installs and activates immediately; works across 500,000+ apps | Low to moderate: signup required; Chrome Extension for writing replay; URL or text scanning requires manual input |
| Strongest differentiator | Real-time grammar, spelling, and tone suggestions across virtually any text field on the web | Patented AI detection with claimed highest accuracy for GPT-5, ChatGPT, Claude 4, Gemini 2.5, Grok 3 |
| Integration breadth | 500,000+ apps including Gmail, Google Docs, Slack, Microsoft Office, and all major browsers | Chrome Extension, Google Docs, WordPress, Moodle, API; deeper but fewer native integrations |
Grammarly vs Originality.AI: For writers focused on grammar, clarity, and tone, Grammarly wins because it offers real-time, in-context suggestions across virtually every website and app. For content publishers, editors, and teams verifying AI-generated content and maintaining originality, Originality.AI is the clear winner due to its patented AI detection and plagiarism checks. Your choice depends on primary need: writing polish (Grammarly) or content verification (Originality.AI).
Detects AI content, checks plagiarism, verifies facts, and optimizes readability for web publishers.
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Core Capabilities: Grammarly vs Originality.AI
Grammarly focuses on improving writing quality: grammar, spelling, punctuation, clarity, conciseness, and tone. It offers full-sentence rewrites and generative AI writing (GrammarlyGO). Originality.AI, in contrast, is a content QA tool that excels at detecting AI-generated text (GPT-5, ChatGPT, Claude 4, Gemini 2.5, Grok 3), checking plagiarism, fact-checking, and analyzing readability. While Grammarly has a plagiarism checker in Premium, it is not as robust as Originality.AI's focus on content integrity. Both offer grammar checking, but Grammarly's is real-time and contextual across apps; Originality.AI's grammar check is part of a broader scan. Grammarly wins for writing assistance; Originality.AI wins for content verification.
AI/Model Approach: Grammarly vs Originality.AI
Grammarly's AI is built around natural language processing for grammar and style, with a generative model (GrammarlyGO) that helps rewrite and compose text. It does not explicitly detect AI-generated content. Originality.AI uses a patented AI detection model that claims the highest accuracy for detecting outputs from major models like GPT-5, ChatGPT, Claude 4, Gemini 2.5, and Grok 3. It provides a Deep Scan feature that explains why text is flagged as AI-written. Originality.AI also offers a Chrome Extension that records a replay of document creation to prove human authorship. Originality.AI wins for AI detection; Grammarly wins for writing enhancement.
Integrations & Ecosystem
Grammarly integrates with over 500,000 apps and websites, including all major browsers, Google Docs, Microsoft Office, Slack, Gmail, Zendesk, and Superhuman. Its browser extension works seamlessly across nearly any text input. Originality.AI integrates with Chrome Extension, Google Docs, WordPress, Moodle, and offers an API. While its integrations are focused on content management and education, they are not as universal as Grammarly's. Grammarly wins for breadth of integrations.
Performance & Scale
Grammarly is used by 40 million individuals and 50,000 organizations, proving its reliability at scale. It processes suggestions in real-time with low latency. Originality.AI is designed for bulk scanning: it can scan entire websites and run multiple checks (AI, plagiarism, fact-check, readability) on a single piece of text. Performance depends on credit usage (1 credit per 100 words), with no real-time suggestion capability. Grammarly wins for real-time performance; Originality.AI wins for bulk content auditing.
Developer Experience & Workflow
Grammarly offers a text editor SDK for developers, though it's not highlighted in the given data. Originality.AI provides an API and plugins for WordPress and Moodle, making it easy to integrate into publishing workflows. Originality.AI's Chrome Extension includes a unique writing replay feature to document human authorship, which is valuable for compliance. Grammarly's workflow integration is more passive and automatic. Originality.AI wins for developer tools and workflow automation for content publishers.
Pricing compared
Grammarly pricing (2026)
Grammarly uses a freemium model. The Free plan offers basic grammar, spelling, and tone detection at no cost. Premium is $12 per month and adds full rewrites, tone adjustment, and plagiarism check. Business is $15 per user per month and includes brand tones, analytics, and SSO. All plans are billed monthly or annually. There is no free trial for Premium/Business, but the Free plan provides a generous preview. Overage or hidden fees are not mentioned.
Originality.AI pricing (2026)
Originality.AI is paid only. The Pay As You Go plan costs $30 for credits (details on credit count not provided). The Pro Plan is $14.95 per month (likely a subscription with included credits). The Enterprise Plan is $179 per month (likely for higher volume or team use). Pricing is per credit (1 credit = 100 words), so costs scale with usage. No free tier exists, though a Chrome Extension trial may be available. No overage fees explicitly stated, but running out of credits requires purchasing more.
Value-per-dollar: Grammarly vs Originality.AI
Grammarly offers better value for general writing improvement: the Free plan already covers basic needs, and Premium at $12/mo is affordable for individuals. Originality.AI is more expensive per usage and is geared toward professionals who need AI detection and plagiarism checking. For a student or professional writing daily, Grammarly provides more features per dollar. For a content publisher scanning thousands of words weekly, Originality.AI's per-word pricing can add up but is essential for verifying content authenticity. Grammarly wins for everyday writing value; Originality.AI wins for specialized content verification where cost is secondary to accuracy.
Who should pick which
- Student polishing essaysPick: Grammarly
Grammarly's free plan checks grammar and spelling in Google Docs, and its tone detection ensures essays are appropriately formal.
- Content publisher verifying freelance submissionsPick: Originality.AI
Originality.AI's AI detector and plagiarism checker confirm if content is original and human-written, crucial for maintaining trust.
- Business professional drafting emailsPick: Grammarly
Grammarly's tone adjustment and clarity suggestions integrated into Gmail and Outlook improve professionalism.
- Editor scanning entire website for readability and SEOPick: Originality.AI
Originality.AI's bulk scan, readability tests optimized for Google ranking, and content optimizer streamline site-wide audits.
- Enterprise team needing brand consistencyPick: Grammarly
Grammarly Business offers brand tones, style guide enforcement, and analytics for $15/user/mo.
Frequently Asked Questions
Does Grammarly have a free tier?
Yes, Grammarly offers a Free plan that includes basic grammar, spelling, and tone detection. Premium and Business plans add advanced features.
Does Originality.AI have a free tier?
No, Originality.AI does not offer a free tier. It uses a credit-based pricing model with Pay As You Go ($30), Pro Plan ($14.95/mo), and Enterprise ($179/mo).
Which tool integrates with Google Docs?
Both do. Grammarly integrates via its browser extension, which works in Google Docs. Originality.AI offers a dedicated Google Docs integration and a Chrome Extension.
Can Grammarly detect AI-generated text?
No, Grammarly does not have an AI detection feature. It focuses on grammar, spelling, tone, and rewriting. Originality.AI specializes in AI detection.
Is Originality.AI suitable for everyday grammar checking?
Originality.AI includes a grammar checker, but its primary strength is AI detection and plagiarism checking. For real-time grammar suggestions across apps, Grammarly is more suitable.
How does Grammarly handle multiple languages?
The provided data does not specify language support. Grammarly primarily supports English. Originality.AI also focuses on English content per its description.
What is the learning curve for Originality.AI?
Originality.AI has a moderate learning curve due to its credit system and multiple scan options. The Chrome Extension simplifies usage, but understanding reports takes some time.
Can I use Grammarly for collaborative real-time editing?
Grammarly works in Google Docs where collaboration is built-in, but it does not have native collaborative editing features. Originality.AI is not designed for collaborative editing either.
Which tool is better for non-native English speakers?
Grammarly is better for non-native speakers because it provides real-time grammar, spelling, and tone suggestions to improve writing across many platforms.
Does Originality.AI offer a plagiarism checker?
Yes, original features include plagiarism checking as part of its content QA suite, alongside AI detection and fact-checking.
Last reviewed: May 12, 2026