About TeacherDetect

TeacherDetect is a free online best ai detector for teachers designed for developers, students and everyone who needs a fast, private and reliable way to get the job done in the browser.

Our Mission

We believe useful tools should be free, fast and privacy-first. That is why TeacherDetect runs entirely in your browser: no signup, no data collection, no servers storing your input.

What We Offer

A growing set of free utilities under the TeacherDetect brand, each built around one clear need and optimized to load instantly on any device.

How We Test

Every ranking on this site starts with a test, not a spec sheet. In our August 2026 round we built a 12-sample set (4 fully AI essays, 4 human-written, 2 AI essays paraphrased by hand, and 2 in a non-native English learner style) and ran it through the free scanners teachers use most: ZeroGPT, GPTZero, Pangram, Winston AI, and Copyleaks. We publish what happened, including the two tools that never scanned for us and the scanner that broke after working twice.

Vendor claims are labeled as vendor claims. Independent findings come from named sources, like the 2023 Stanford-led study in Patterns on false flags for English learners. When we could not run a test ourselves, we say so in the same sentence as the claim, and we retest each school term because these tools retrain constantly.

Editorial Policy

Independent testing. Rankings are based on our own test results, official product documentation, and named third-party research. No vendor pays for a position, and no ranking is for sale.

Affiliate disclosure. Some links on this site are affiliate links. If you buy through them we may earn a commission at no extra cost to you. Commissions never change a verdict; when a price or a claim no longer matches our testing, the page gets the correction in the same retest cycle.

Corrections. Found an error, a changed price, or a claim that reads wrong? Email [email protected] and we will fix it in the same retest cycle.