Free AI Checker for Teachers

Yes. Proofademic offers a free tier that lets any teacher check up to 1,000 words with no credit card required. You get the same sentence-level detection and confidence scoring as paid plans. For teachers who need to check more student work, plans start at $8 per month with 200,000 words.

Paste the student’s text into Proofademic or upload the .docx or PDF file directly. The AI detector analyzes every sentence individually and flags sections that show patterns consistent with ChatGPT, Claude, and other AI writing tools. You’ll see a confidence score for each sentence, so you can identify exactly which parts were likely AI-generated instead of relying on a single overall percentage.

Yes. Free AI detector for teachers like Proofademic are specifically trained to recognize patterns in ChatGPT-generated text, including the latest GPT-5 model and all earlier versions. Proofademic also detects writing from Claude, Gemini, and other major AI models. The key advantage for teachers is sentence-level detection. You see exactly which sentences were flagged, not just a vague score.

Many schools and universities now use AI detection tools as part of their academic integrity process. Some institutions use Turnitin’s AI detection feature through existing contracts, while individual teachers often use standalone tools like Proofademic. Proofademic is designed so that any individual teacher can sign up without waiting for a school-wide purchase. You can start checking student work today.

The best AI detector for teachers needs to be accurate, affordable, and easy to use without an institutional contract. Proofademic checks all three. Its detection engine is built specifically for academic writing, it includes a paraphrase shield that catches rewritten AI content, and any teacher can sign up individually with 1,000 words free.

Basic paraphrasing and synonym swapping can fool some detectors, but Proofademic’s paraphrase shield is designed to detect AI content even after it has been rewritten. The detector looks for deeper linguistic patterns that survive paraphrasing. Things like sentence structure, semantic flow, and statistical markers that are characteristic of AI models, not human writers.

No. Proofademic processes all text in secure, ephemeral environments. Student submissions are analyzed and then discarded. We never store essay content, share it with third parties, or use it to train AI models. Student privacy is built into how the system works, not just a policy on a page.

No. Unlike Turnitin, which typically requires an institutional contract, Proofademic is available to individual teachers. You can create an account, start with the free tier, and upgrade on your own if you need more capacity. No purchase orders, no IT department approval, no waiting.