H
HReadability editor that flags wordy, unclear writing and offers AI fixes
From $8.33/mo
Grammarly vs Originality.ai
Pricing, features, platforms and who each one suits — side by side.
G
Choose Grammarly if…
- you work on Windows, macOS, iOS
- you're in its core audience: students, professionals
O
Choose Originality.ai if…
- you need an API to build on
- you're in its core audience: content publishers, marketing agencies
Side by side
Feature Grammarly Originality.ai
Pricing modelFreemiumFreemium
Starting price—$12.95/mo
Free plan
Free trial
API
Open source
Trains AI on your contentYes, unless you opt outYes, unless you opt out
Data retentionSaved documents kept until you delete them or your accountScan history kept 30 days (Pro) or 365 days (Enterprise)
Security and complianceSOC 2 Type II—
AI rewrites—
Plagiarism checker—
AI text detection—
Non-English checking—
Word/Google Docs add-in—
Browser extension—
Custom style guide—
PlatformsWeb, Windows, macOS, iOS, Android, ChromeWeb, Chrome, API
CategoryGrammar & ProofreadingAI Detection & Humanizers
CompanySuperhuman Platform Inc.Originality AI Inc.
Based inUnited StatesCanada
Founded20092022
Part ofSuperhuman—
Key features
G Grammarly
- Real-time spelling, grammar and clarity checks
- Paragraph and full-sentence rewrites
- Tone suggestions for different audiences
- Reader Reactions predicts how readers respond
- AI Detector and Humanizer agents
- Plagiarism checker and citation generator
- Works in MS Office, Google Docs and browsers
- Enterprise style guides, brand tones and DLP
O Originality.ai
- AI text detection with sentence-level highlights
- Plagiarism checker
- Fact and AI hallucination checker
- Grammar and readability checkers
- Bulk Scan for many documents
- Writing Replay showing how a document was written
- Deep Scan editing suggestions
- Shareable reports and PDF downloads
Plans and prices
From each vendor's site. Prices change — confirm before buying.
Grammarly
Free€0
Pro€12/member/mo billed annually (€30 billed monthly)
EnterpriseCustom
Originality.ai
FreeFree
Pro$14.95/mo, or $12.95/mo billed yearly ($155.40/yr)
Enterprise$179/mo, or $136.58/mo billed yearly ($1,638.96/yr)
Strengths and limitations
Grammarly
- Free plan includes grammar checks and 100 AI prompts a month
- Available on desktop, mobile, browser extensions, MS Office and Google Docs
- Pro includes plagiarism and AI-text detection
- Enterprise offers SSO, SCIM, BYOK and data loss prevention
- Pro costs €30 when billed monthly versus €12 billed annually
- Free plan is limited to 100 AI prompts per month
- Enterprise pricing is not published
Originality.ai
- Free tier includes AI, plagiarism, grammar and fact checks
- Pro plan starts at $12.95/mo billed yearly
- Integrations for Chrome, Firefox, Google Docs, Moodle and Google Classroom
- Detects text that was paraphrased with AI
- API access only on the $179/mo Enterprise plan
- Credit-based usage: 1 credit equals 100 words
- Pricing page gives conflicting details on free credits and Pro scan history
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Built from each vendor's public website; we haven't tested them hands-on. Editorial policy