Category
AI content detectors: what they are and who makes them
dedicated detection specialists, writing assistants with a detector built in, institutional integrity suites, free checkers bundled with humanizers: Pangram, Winston AI, Originality.ai through Smodin.
Types of AI content detectors
Dedicated detection specialists
Pangram, GPTZero, Winston AI and Originality.ai were built around detection and sell little else. They publish more about how their models work, offer scan history and reports, and tend to add plagiarism checks, browser extensions and an API on top.
Writing assistants with a detector built in
Grammarly and Sapling add an AI score to a grammar and rewriting product. The detector is a side feature, convenient for a writer who already works inside that editor, but it offers far less reporting and archiving than a specialist does.
Institutional integrity suites
Turnitin sells AI writing detection to schools, universities and publishers as part of a wider integrity platform. Access runs through an institutional licence, so students and individual writers usually meet it through their institution rather than buy it themselves, and prices are negotiated per contract.
Free checkers bundled with humanizers
ZeroGPT and Undetectable AI offer a free text check beside tools that paraphrase or rewrite text. They are easy to try, but the company selling the detector also sells a way to evade detection, which is worth weighing before trusting its score.
Facts at a glance
| Tool | Publisher | Based in | Access |
|---|---|---|---|
| Pangram | Pangram Labs, Inc. | United States | Free tier + API |
| Winston AI | Winston AI inc. | Canada | Trial + API |
| Originality.ai | Originality AI Inc. | Canada | Free tier + API |
| GPTZero | GPTZero | United States | Free tier + API |
| Sapling | Sapling Intelligence, Inc. | United States | Free tier + API |
| ZeroGPT | Olive Works LLC | United States | Free tier + API |
| Turnitin | Turnitin | United States | Paid |
| Grammarly | Superhuman Platform Inc. (formerly Grammarly, Inc.) | United States | Free tier |
| Undetectable AI | Undetectable AI | United States | Trial + API |
| QuillBot | Learneo, Inc. | United States | Free tier |
| Smodin | Smodin LLC | United States | Trial + API |
