Proofademic vs GPTZero – Tested Both for a Month. Here’s What I Found.
I’ve been testing detection tools seriously for about a year now and decided to do a proper head-to-head between Proofademic and GPTZero after seeing Proofademic mentioned a few times on here.
Testing conditions: 40 essays from my grade 11 English classes this term. 15 confirmed AI-generated (students disclosed), 20 confirmed human (process documentation), 5 unknown ground truth.
GPTZero (free tier):
– Caught 12/15 AI essays (80%)
– False positives on human essays: 4/20 (20%)
– French essays: significantly worse, 2 additional false positives
Proofademic:
– Caught 13/15 AI essays (87%)
– False positives on human essays: 2/20 (10%)
– French essays: comparable accuracy to English, only 1 false positive
the difference in false positive rate matters more to me than the detection rate. 20% false positive rate means wrongly flagging 1 in 5 genuine essays. 10% is still high but meaningfully better.
The sentence-level breakdown in Proofademic is also genuinely useful – it shows you exactly which sentences are flagged, which helps distinguish between “this student got AI help” and “this whole essay is AI.”
Worth trying if you’re doing serious detection work.
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the french essay parity is the most interesting finding here. if its accurate that's genuinely different from the other tools we've tested.
the false positive rate is the real story. 10% is still unacceptably high for formal use but the GPTZero 20% is genuinely problematic. your methodology is sound for a classroom study - what did the 5 unknown essays come back as?
3 of the 5 unknowns were flagged high by both tools. 2 were low confidence on both. i had conversations with all 5 students - 2 admitted to AI assistance after conversation (the two both tools flagged high), 3 denied it. consistent enough that i'm not taking the detection result as conclusive on any of them.
a month is a solid testing window. most comparisons I see are single-session tests. the consistency data over time is what actually matters for classroom use and I don't see that in most reviews. bookmarking this one.