GPTZero vs SlopProx

GPTZero identifies likely AI-generated writing and highlights detected AI use at document, sentence, and word level. Its detector can classify text as human, AI, or mixed, and provides confidence scores, explanations, AI vocabulary, and sentence-by-sentence highlighting. Advanced Scan points to passages contributing most to an AI classification. Users can submit pasted text or DOCX, PDF, and image files; the technology page says it can analyze up to 50 files at a time. GPTZero lists support for English, German, Portuguese, French, and Spanish, and detector coverage for text from ChatGPT, GPT-3 through GPT-6, Gemini, Claude, Copilot, and other models. Additional tools include Writing Replay, plagiarism checking, writing feedback, and grammar checking. The Chrome extension scans webpages and Google Docs, and integrations include Google Classroom, Canvas, an API, and Zapier. GPTZero says its results may be wrong, perform better on longer English prose, and should not be used alone to punish students. The free plan costs nothing. Paid plans start at $8.33 a month when billed annually.

SlopProx is a Windows desktop app plus Chrome and Firefox extensions that detect and hide AI-generated text, images, and YouTube videos while browsing. Text analysis combines more than 76 curated phrases and structural signals with an on-device ONNX transformer. Image checks use three ONNX vision models and inspect C2PA manifests, EXIF data, and PNG metadata. The YouTube filter checks an AI disclosure before the player renders, then can overlay videos or dim feed and search cards. Optional Enhanced Mode uses a local HTTPS proxy to block 29 listed ad networks and installs a local certificate without administrator rights. The maker says all processing stays on the device, with no cloud calls, telemetry, or data leaving the machine. Integrations include email, Google Docs, and CMS workflows through the extension. The project is GPL-3.0 open source. Open Source costs nothing. Individual Pro is listed at £49 a year, and Teams at £10 a month, billed annually per seat with a five-seat minimum. Pro is marked coming soon.