HeimWall

HeimWall is a macOS application that provides observability for AI coding tools by monitoring prompts typed into Cursor, Claude Code, Copilot, and ChatGPT Desktop. It detects and masks secrets and PII on the laptop before any data is recorded, creating a tamper-evident audit log. The product targets engineering teams and IT/security leaders in enterprises concerned about data leakage in AI-assisted workflows. It differentiates by operating on-device with deterministic rules, avoiding network calls and not sitting in the send path, thus not slowing down or breaking the workflow.

Key features

• On-device detection with 47 rules
• Masks secrets and PII before recording
• Tamper-evident audit log
• Read-only capture via Accessibility API
• Clipboard monitoring
• Cross-tool support for Cursor, Claude Code, Copilot, ChatGPT Desktop
• Deterministic rules, no network call
• Warns as you type