Sinaptic.ai is a privacy-first browser extension in 2026 designed to prevent accidental leakage of PII (Personally Identifiable Information) and PHI (Protected Health Information) to AI tools like ChatGPT, Claude, and Gemini. It scans inputs and network requests in real-time using a local hybrid Regex + NLP engine, blocks sensitive data transmission, provides visual alerts, and supports custom rules—all processed entirely on-device with no data sent to servers. Ideal for compliance-focused users, developers, and enterprises ensuring secure AI workflows.