Free AI detector with generous input limits and simple interface.
ZeroGPT is a convenient first‑pass detector, matching GPTZero’s 65 % accuracy in RAID but prone to false negatives—use it only for low‑stakes checks. Also the false positive is the highest compared to other paid detectors tools (Originality, Turnitin…).
65.5 %
0.9 %
Easy to bypass via paraphrasing
20
Proprietary DeepAnalyse™ model layers macro‑level entropy metrics and micro pattern analysis to estimate AI probability, returning a percentage and sentence highlights.
Check up to ~15 k chars anonymously.
Multi‑level assessment claims high recall.
Paid tiers unlock higher quotas and JSON API.
| Benchmark | Accuracy | False Positive | Adversarial Robustness | Notes |
|---|---|---|---|---|
| RAID (6 M docs) | 65.5% | 0.9% | Fails under paraphrase tricks | Similar accuracy to GPTZero base |
| Other Studies | % | % | Not in OIS study |
ZeroGPT’s low barrier to entry makes it ubiquitous, but inconsistent detection on paraphrased AI text means it should be paired with a stronger secondary tool when accuracy matters.
Core checker is free; Pro subscription (~$9.99/mo) boosts limits and removes ads, while API pricing is pay‑per‑request.
Students self‑checking essays quickly.
Bloggers getting instant AI score.
N/A due to high FN risk.
Developers integrating low‑cost API.
Looking to explore other AI detection tools? Here are our curated picks with quick highlights so you can compare at a glance.
Use ZeroGPT for quick, free impressions, but verify critical documents with a more sensitive detector because clever rewrites frequently evade its DeepAnalyse™ engine.