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>log in to commentHey DevHunt, I built WinSystemHarden because I got tired of hardening scripts that break things and give you no way to undo them. It's a native C# desktop app. It applies 29 security rules (disabling SMBv1, closing ports, ACL hardening), but the key feature is safety: it takes a snapshot of your ACLs and system state before making changes. If an old app or printer stops working, you just click rollback and it reverts everything instantly. It's 100% offline, completely free, and doesn't require any accounts. I'd love to hear your feedback on the rollback logic or any specific CIS rules you think I should add next.
WinSystemHarden is a free offline tool that applies 29 CIS/NSA-inspired hardening rules to Windows 10/11 systems.
- for
- Windows users who need local, no-cloud system hardening
- pricing
- free
- license
- open source
- V1.3WinSystemHarden V1.3 (Free）a month ago
Key features
- One-click hardening — Applies 29 security rules to disable legacy protocols and close high-risk ports with a single click.
- One-click rollback — Restores the system to any previous restore point instantly if changes cause issues.
- Three hardening plans — Standard, Deep, and Custom plans let users choose the level of hardening.
- Offline operation — All processing runs locally with no cloud, telemetry, or data collection.
- CIS & NSA guidance — Rules are based on industry-standard CIS Benchmarks and NSA guidelines.
Use cases
- Secure a fresh Windows 10/11 installation before connecting to a network
- Remove legacy SMBv1 support on legacy machines
- Quickly revert hardening changes after testing software compatibility
WinSystemHarden vs alternatives
 aikido |  Offsend Browser Extension |  BoringSec |  LAN Sheriff | ||
|---|---|---|---|---|---|
| Best for | Offline Windows hardening | Developer security guidance | AI prompt secret masking | Code security scanning | Network visibility |
| Pricing | Free | Free | Free | Subscription | Free |
| DevHunt upvotes | 1 | 65 | 11 | 3 | 32 |
| Launched | Oct 2031 | Dec 2024 | Jun 2026 | Oct 2026 | Aug 2026 |
- WinSystemHarden vs aikido: Focuses on developer-oriented security advice rather than OS hardening
- WinSystemHarden vs Offsend Browser Extension: Masks secrets in AI prompts, not system hardening
- WinSystemHarden vs BoringSec: Finds and fixes code-level security issues, not Windows configuration
- WinSystemHarden vs LAN Sheriff: Maps network traffic, not applies OS hardening rules
WinSystemHarden FAQ
Do I need to create an account or sign up to use WinSystemHarden?+
No, the tool is completely free and requires no sign-up or cloud connection.
Will WinSystemHarden send any data to the internet?+
No, it is 100% offline with zero telemetry or data collection.
Can I undo the hardening changes if something breaks?+
Yes, a one-click rollback restores the system to any previous restore point.
What Windows versions are supported?+
WinSystemHarden works on Windows 10 and Windows 11.
What security guidelines does the tool follow?+
The hardening rules are inspired by CIS Benchmarks and NSA guidelines.
Summarized by DevHunt from nisse-sec.com · Oct 25, 2026. Details may change; check the official site.
