An AI text detector with a built-in humanizer, positioned as a GPTZero alternative. Detection returns sentence-level scores and names the likely source model (40+ recognized, including GPT-5, Claude, Gemini); the humanizer rewrites AI text and shows before/after detection scores. Ships an MCP server so Claude and other clients can call detection and humanization directly. Vendor-stated accuracy is 93% (not the 99.7% some directories list). Pricing: $9.90/mo or $99/yr for unlimited detection + 5,000 humanizer words/month; humanizer word packs $5–$35. Free demo, no account, content not stored. Note: third-party traffic analysis estimates near-zero monthly visits (DR 13), so real-world usage is unverified; the vendor\'s own blog documents detector false positives extensively, including a 61% false-positive rate on non-native English essays from a Stanford study. Treat any score as a signal, not a verdict.

One of the earliest and most widely used AI text detectors, founded by Princeton student Edward Tian in January 2023. Detects AI-generated text across models (ChatGPT, Gemini, Claude, Llama, etc.), highlights sentence-level AI content, and offers integrations with Google Docs and a Chrome extension. Current product also includes plagiarism detection, grammar feedback, and writing-process verification. Note: the vendor\'s \"99.9% accuracy\" claim is contested—independent tests have documented false positives on human-written text (e.g., a high-school essay flagged 62% AI; the US Constitution flagged as AI-generated). GPTZero itself states results should not be used to punish or as a final verdict, and that no detector is 100% accurate. Has an ESL de-biasing claim. ARR reported at ~$24M (36Kr, Mar 2026). Free tier available; paid pricing on official site.