
HeimWall
Catch secrets before they leak into Cursor & Claude
About HeimWall
HeimWall is a lightweight, on-device macOS application designed to prevent sensitive information from leaking into AI coding assistants like Cursor, Claude Code, and Copilot. Utilizing 47 carefully crafted, hand-written rules, it detects and flags potential leaks of secrets, credentials, and personally identifiable information (PII) in real-time before they can be sent to external AI platforms. The tool prioritizes user privacy by ensuring that all prompts and data remain solely on the user's Mac, with no content stored, accounts created, or sign-ups required. Its focus on security and privacy makes it particularly appealing to individual developers and teams seeking to safeguard proprietary information without sacrificing productivity.
Screenshots



Pros
- ✓On-device processing ensures maximum privacy and data control
- ✓Real-time detection with 47 hand-crafted rules for high accuracy
- ✓Simple, lightweight macOS app with no account or sign-up needed
- ✓Free for individual engineers, making it accessible
Cons
- ✗Limited to macOS, excluding Windows and Linux users
- ✗Focuses primarily on detecting leaks rather than comprehensive security features
- ✗Next features like team dashboards are upcoming, not yet available
Use Cases
Pricing
HeimWall is free for individual engineers, with potential future plans for team-based features likely to include tiered pricing or subscriptions. As of now, it appears to be a free, standalone app with no upfront costs.
Quick Info
Topics
Makers
Safak Gungor
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