Duplichecker (duplichecker.com) is a content originality and AI detection platform that combines traditional plagiarism checking with built-in AI content detection — a capability included on both the Basic and Pro plans, making it accessible without upgrading to a higher tier. The platform checks submitted text against a broad database of web pages and online sources, returning a similarity percentage with highlighted matched passages and source URLs, while simultaneously analysing the content for signals associated with AI-generated writing. The Basic plan covers 30,000 words per month without API access or additional user seats, while the Pro plan scales to 72,000 words per month with API access and 2 user seats — making it suitable for small teams and developers integrating plagiarism checking into their own tools or platforms. Annual billing is available on both plans at a meaningful discount.
Duplichecker is designed to serve a broad audience — from individual students and bloggers using the Basic plan for occasional originality checking, to content teams and SaaS developers on the Pro plan who need API-level integration and multi-user collaboration. The inclusion of AI detection on the Basic plan ensures that users at every subscription level can assess whether submitted content triggers AI writing pattern signals — addressing the growing challenge faced by educators, publishers, and content platforms in verifying that content is genuinely human-written. The Pro plan's API allows developers to build plagiarism and AI detection capabilities directly into content management systems, writing tools, academic platforms, or custom publishing workflows.
How Duplichecker Works
Users paste text or upload a document into the Duplichecker interface. The system runs a dual analysis: a plagiarism scan comparing the submission against web sources and returning a similarity percentage with matched passage highlights and source URLs, and an AI detection scan assessing the probability that the content was generated by an AI language model. Results for both analyses are available in the same session. Word consumption counts against the monthly allocation, which resets each billing cycle. Pro users access the API to submit content programmatically and receive plagiarism and AI detection results in their own applications. Additional users can be added up to the 2-seat limit on Pro plans.
Key Features
- AI Detection — built-in AI-generated content identification included on both Basic and Pro plans, no upgrade required
- Plagiarism Checker — similarity scanning against web pages and online sources with percentage scores and matched source URL reporting
- 30,000 words/month — Basic plan monthly word allocation for plagiarism and AI detection checking
- 72,000 words/month — Pro plan monthly word allocation covering approximately 2.4× the Basic plan volume
- API access — programmatic plagiarism and AI detection integration for custom applications, CMS, and academic platforms (Pro plan)
- 2 user seats — team access for up to 2 users on the Pro plan (0 additional seats on Basic)
- Annual billing discount — save approximately 20% on Basic (from $9.99 to $7.99/month) and Pro (from $19.99 to $15.99/month) with annual payment
- Document upload support — check content from uploaded documents rather than copy-paste text only
- Source URL reporting — matched passages include links to original sources for direct verification
- Cancel anytime — both plans available without long-term lock-in on monthly billing
Duplichecker Pricing
- Basic — $9.99/month (or $7.99/month billed annually) — 30,000 words per month, 0 additional user seats, no API access. AI Detection included. Cancel anytime.
- Pro — $19.99/month (or $15.99/month billed annually) — 72,000 words per month, 2 user seats, API access included. AI Detection included. Cancel anytime.
No permanent free plan. Annual billing saves approximately 20% on both plans. Always verify current rates at duplichecker.com/pricing.
Who Should Use Duplichecker?
Duplichecker is well-suited to individual writers, students, educators, and content teams who need both plagiarism detection and AI content detection in a single platform without adding separate subscriptions. The Basic plan suits individuals who check content at moderate monthly volumes and do not need API access or team seats. The Pro plan is appropriate for small content teams of up to 2 users, or for developers who need to integrate plagiarism and AI detection into their own tools via the API. Teams needing more than 2 user seats, higher monthly word volumes, or advanced features like cross-language detection and website scanning should evaluate platforms with more extensive enterprise capabilities.
Frequently Asked Questions
What is Duplichecker?
Duplichecker is a plagiarism and AI content detection platform that checks submitted text against web sources for similarity and analyses it for AI-generated writing patterns. AI Detection is included on both the Basic and Pro plans. The Pro plan adds API access and 2 user seats, making it suitable for small teams and developers building content checking into their own applications.
Does Duplichecker have a free plan?
Duplichecker does not offer a permanent free subscription plan. Paid plans start at $9.99 per month on the Basic plan, with annual billing reducing this to $7.99 per month. Limited free checks may be available on the website for short texts without a subscription.
Does Duplichecker detect AI-generated content?
Yes. AI Detection is included on both the Basic and Pro plans, meaning users at the lowest subscription tier have access to AI content identification alongside plagiarism checking. This makes Duplichecker suitable for educators, publishers, and content managers who need to verify both originality and human authorship of submitted content.
Does Duplichecker offer API access?
Yes. API access is included on the Pro plan, allowing developers to submit content to Duplichecker programmatically and receive plagiarism and AI detection results in custom applications, content management systems, academic platforms, or publishing tools. API access is not available on the Basic plan.
How many users can access a Duplichecker account?
The Basic plan does not include additional user seats — it is intended for individual use. The Pro plan includes 2 user seats, allowing a small team to share a single Pro subscription. Teams needing more than 2 collaborative seats should consider whether a higher-capacity platform or an Enterprise plan better fits their team size.
