G
GCopyleaks AI Detector vs Grammarly
Pricing, features, platforms and who each one suits — side by side.
C
Choose Copyleaks AI Detector if…
- you need an API to build on
- you're in its core audience: educators, students
G
Choose Grammarly if…
- you work on Windows, macOS, iOS
- you're in its core audience: students, professionals
Side by side
Feature Copyleaks AI Detector Grammarly
Pricing modelFreemiumFreemium
Starting price$13.99/mo—
Free plan
Free trial
API
Open source
Trains AI on your content—Yes, unless you opt out
Data retention—Saved documents kept until you delete them or your account
Security and compliance—SOC 2 Type II
PlatformsWeb, APIWeb, Windows, macOS, iOS, Android, Chrome
CategoryAI Detection & HumanizersGrammar & Proofreading
Rank in its category—#1 of 5
CompanyCopyleaksSuperhuman Platform Inc.
Based in—United States
Founded—2009
Part of—Superhuman
What you'd pay
The cheapest plan that fits, per month, billed yearly where the plan offers it.
| Team size | Copyleaks AI Detector | Grammarly |
|---|---|---|
| 1 person | $13.99 Personal | no published plan |
| 5 people | $74.99 Pro | no published plan |
| 20 people | $74.99 Pro | no published plan |
What the free plans include
Copyleaks AI Detector
Free plan limits aren't published.
Grammarly
- Generate text with 100 AI prompts (100 prompts / month)
- 1 style guide
- 1 brand tone
- User groups: 2
Key features
C
- Detects AI-generated text from ChatGPT, Gemini and others
- Plagiarism detection for text
- AI image detection
- Credit system: one credit covers 250 words or one image
- One-time extra credit purchases
- API access on enterprise plans
- LMS integration for education
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
Plans and prices
From each vendor's site. Prices change — confirm before buying.
Copyleaks AI Detector
FreeFree
Personal$16.99/mo, or $13.99/mo billed annually
Pro$99.99/mo, or $74.99/mo billed annually
Education / EnterpriseCustom
Grammarly
Free€0
Pro€12/member/mo billed annually (€30 billed monthly)
EnterpriseCustom
Strengths and limitations
Copyleaks AI Detector
- Free credits for new users
- Covers AI detection, plagiarism and image detection in one plan
- Annual billing lowers Personal to $13.99/mo
- Unused monthly credits are cancelled at the end of each month
- API and LMS access only on custom-priced plans
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
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Facts from each vendor's public pages, prices checked Oct 26, 2026. Editorial policy