Grammarly vs Originality.AI

Originality.AI positions as a content integrity suite, not a general assistant. Its standout is AI detection covering a wide range of models (GPT-5.5, Claude Opus 4.7/4.8, Gemini 3/3.1, etc.), backed by patented technology. It includes plagiarism and fact checking, readability, grammar, and a content quality score—more than just detection. The new Guideline Checker (news) lets editors align writing with custom guides pre-publication, and bulk scan handles entire websites, ideal for large-scale QA. Its Chrome Extension with Google Docs replay records document creation, proving ownership. Uniquely, deep scan explains detection reasoning.

Grammarly is a broad writing assistant: real-time grammar, tone suggestions, full-sentence rewrites, translation in 19 languages, and multilingual corrections. Its AI text generation (100 free prompts, 2,000 Pro) helps draft content, but with limits. It has AI Detector and Humanizer agents, but detection is a secondary feature. Collaborative Docs with context-aware agents enhances team editing. Grammarly's integrations span browsers, Office, and Zendesk, while Originality.AI offers niche ones like Moodle and WordPress.

For your use case: if you need rigorous originality verification with explainability, Originality.AI is unmatched; if you need daily writing polish across apps, Grammarly excels.

Originality.AI uses freemium with a very limited free tier—enough for a few scans. Paid options: Pay As You Go credits, Pro at $14.95/mo monthly or $12.95/mo yearly, and Enterprise at $179/mo monthly or $136.58/mo yearly. The Pro plan likely includes most features, but bulk scan and some tools may be enterprise-only. If you're an individual publisher, Pro is affordable but you might burn through credits quickly if scanning large volumes.

Grammarly also freemium: free indefinite with basic grammar/spelling. Pro at $12/member/month (annual is cheaper than monthly, likely ~$30/mo monthly) includes full-sentence rewrites, tone, plagiarism, and 2,000 AI prompts—good for heavy users. Enterprise is custom, offering unlimited prompts and admin controls.

Cost comparison: Grammarly Pro is slightly cheaper annually ($144/year vs ~$155/year for Originality.AI Pro). For a team, Grammarly scales per member; Originality.AI's Enterprise flat fee at $179/mo might be better for large teams scanning many documents, but that's a big jump from Pro. If you mainly need AI detection occasionally, Originality.AI's Pay As You Go credits could be cost-effective. Consider your volume: Grammarly is better for continuous writing assistance; Originality.AI for periodic integrity checks.