ContentDetector.org vs Detecto

ContentDetector.org is a free tool that estimates whether text was AI-written and reports a percentage split between AI-written and human-written content. Users can paste text, upload a file, or submit a URL for a report with a score, section highlights, and review guidance. The site says the detector evaluates token-pattern predictability, semantic repetition, formatting regularity, and local stretches of uniform phrasing, including patterns associated with GPT-5, Gemini, Claude, and other large models. It also offers a converter that rewrites AI-generated text to improve tone, flow, clarity, and sentence variety; the converter page shows a 1000-character input counter. Other listed options include API access and bulk checks of folders or URL lists. Platforms include web, extension, iOS, macOS, and Windows. The site says inputs are not used to train models and describes retention controls; its FAQ says inputs are removed when the tab is closed, while the converter page says submitted content is processed instantly and not stored. It warns results can be wrong, especially for very short or heavily edited text, and recommends human review.

Detecto is a web service that estimates AI-generation likelihood for text, images, video, and audio, returning calibrated probabilities, supporting evidence, and reviewer reports. Text reports can highlight sentences and show perplexity, burstiness, and a confidence band. Image reports include generation likelihood, a region heatmap, surface-artifact flags, and metadata-integrity checks. Reviewers can add notes, save reports, export PDFs, and share controlled links. Scans and reports are private to the account by default; ephemeral mode allows scanning without storing content or reports. Detecto says submissions are never used to train its detection models. The service is aimed at editors, educators, newsroom verification desks, PR teams, agencies, publishers, and universities. A free tier includes starter credits and full report fidelity without a card. Student costs $6.99 a month billed $83.88/yr; Pro costs $19.99 a month billed $239.88/yr; Max costs $59.90 a month billed $718.80/yr. Scores are probabilistic, not proof, and short or translated text can affect detection.