Per-app network firewall
and bandwidth governor for Windows.
Block any executable's connections. Cap bandwidth on a per-process basis. Watch hourly + daily quotas tick down. NetClamp does what NetLimiter does — natively, via a custom Windows Filtering Platform driver, and ships as a single signed installer.
Currently in pre-release. The kernel driver and service are running on the maintainer's machines today; the public installer is pending WHQL attestation and Authenticode signing. See the full status →
Windows 10/11 · ~25 MB · free tier covers 3 rules & quotas
What it does
Block by process
Point at an .exe; outbound and inbound traffic stops at the kernel. WFP filters install in milliseconds, survive reboots, survive BFE bounces.
Rate-limit by process
Cap upload or download to any speed, per executable. Kernel-mode shaper, not a userspace proxy — works with games, torrents, Steam, anything.
Hourly & daily quotas
Set a 5 GB/day budget on an app and the service throttles or blocks when it crosses. Quotas reset on the clock, not on app restart.
Live monitor
System-tray icon shows up/down arrows that pulse with load. Click for a flyout with per-app rates and a one-click "throttle to 200 KB/s" button.
REST + gRPC API
Local-only HTTP on :9845 and gRPC on :9846. Embedded SPA shows rules, history, alerts. CLI ships in the same installer.
Single signed installer
One Inno-Setup .exe drops the service, tray, kernel driver, and CLI. Code-signed; the kernel driver is WHQL-attested (in progress).
How it works
- Install. Run the installer. The service registers itself; the tray icon appears; the kernel driver loads.
- Open the dashboard. The tray icon opens an embedded web UI at
http://localhost:9845. Auth is local-only via a token written to%ProgramData%\NetClamp\auth.token. - Pick an app. The picker scans running processes and recently-launched binaries. Set Block, Allow, or Rate-Limit + a cap.
- Watch it work. WFP filters apply within ~50 ms. The tray icon turns red when something's being throttled; the monitor pane shows live throughput.
Pricing
NetClamp is commercial, closed-source software. No subscriptions, no recurring fees, no expiration on activated credits — you pay once and keep using it.
Free
- 3 managed entities (rules + quotas)
- All features unlocked
- Local-only API
- No nag screens, no time limit
+10 credits
- +10 managed entities, permanently
- One-time purchase, no auto-renewal
- Transferable between your machines
- Stackable — buy as many as you need
Buy from inside the app: Settings → License → Buy more. Checkout via Lemon Squeezy (Merchant of Record — they handle VAT). 14-day refund window on unused credits.
Download
Pre-release · installer not yet available
The kernel driver, service, tray app, and SPA are all running. Pending: Microsoft Hardware Dev Center attestation for the kernel driver, Authenticode code-signing for the user-mode binaries, and the Stripe wiring behind the credit purchase flow. Drop your email and you'll be the first to know when the installer ships.