Copyscape is the original plagiarism checker: for over two decades the industry standard for finding copies of your content online — and now the originality gate for AI-generated text, powering the checkers inside tools like Jasper.
Copyscape answers one question better than anyone: has this text appeared online before? Enter a URL or paste a document and it scans the web for matching content, reporting similarity percentages with direct links to every source — either to catch scrapers stealing your pages or to verify a freelancer’s (or a model’s) draft before you publish it. That second use is why it matters more in the AI era: generated text can quietly reproduce passages from the internet, and Copyscape is the check publishers run before anything goes live — Jasper’s own plagiarism checker is powered by it.
The product family covers the full protection loop. Premium checks support batch search, offline comparisons and a private index that is never shared with other users. Copysentry automates defense: it monitors the web for copies of your pages on a weekly or daily cycle and emails you the moment a new copy appears, with case tracking built in. An API lets platforms bake checks into their delivery pipeline, an Enterprise option runs the engine on your own infrastructure for maximum control, and free warning banners deter casual copying. Press from Time to Forbes has called it a productivity essential for two decades.
There is no subscription for checking: the free version runs basic URL checks, and Premium is pay-per-search at $0.03 per search for up to 200 words plus $0.01 per additional 100 words — a 1,500-word article costs about 16 cents in credits. Copysentry monitoring is $4.95/month for up to 10 pages (weekly checks) or $19.95/month for daily Professional monitoring.
Publishers, content agencies, SEO teams and educators who need a definitive copied-or-not answer. It checks against the public web only — academic databases are a different tool’s job — and the interface proudly remains a tool, not a writing suite.