What are the system requirements?

Rouler requires 64-bit Intel or AMD Windows; there's no ARM build yet. The interface is English only for now.

Why does Windows show a SmartScreen warning for the installer?

Windows may show a SmartScreen warning because the certificate hasn't yet built up reputation. The installer is signed with an EV certificate and the driver is signed by Microsoft; you can choose More info, then Run anyway. The warning goes away once reputation builds up.

How does Rouler affect performance?

In everyday use you won't notice it running: games and calls feel the same, uploads run at full speed even on a 2.5 Gb/s connection, CPU use is very low, and the minimised app settles to about 15–20 MB of memory. The installer is 4.3 MB.

What happens to traffic a rule's interface can't carry?

Rouler blocks it rather than sending it elsewhere, so ruled traffic is blocked rather than leaked.

Rouler — Split tunnelling for Windows — rules for your routes

Rouler is split tunnelling software for Windows. It lets you decide which network interface each app (or each destination IP/subnet) uses — for example, sending your browser through a privacy VPN, work apps through a work tunnel, and everything else through your normal connection — with multiple VPN clients like WireGuard, Tailscale, Mullvad, OpenVPN and AmneziaWG running side by side. It works at the network-interface level via a custom Rust-written Windows driver, so it isn't tied to any particular VPN client and nothing needs importing.

Key Features

Rule-based split tunnelling

Create rules that match an app, a destination IP or subnet, or both, and send that traffic out the interface you choose. One app can use different interfaces for different destinations, and anything without a rule goes through normal Windows routing.

Works with any VPN client

Operates on Windows network interfaces rather than specific VPNs, so it works alongside the official WireGuard client, Tailscale, Mullvad, OpenVPN or AmneziaWG — with several running at the same time. VPN clients keep running as normal.

Custom Rust network driver

Uses its own small Windows network driver that changes as little of the system's networking as possible: no virtual network adapters, no user-mode proxy, no custom NAT, and nothing designed to trip game anti-cheat. It applies rules just before Windows makes its routing decision and doesn't edit the

Rules for apps and Windows services

Make rules for programs and for Windows services, so background services use the interface you choose. Rules for packaged apps and folders are planned.

Live activity view

See every connection, the rule it matched, and the outcome — diverted, routed by Windows, or blocked — in a live view. You can also right-click a connection in the activity view to create a rule from it.

Leak protection over silent failover

If a rule's interface can't carry the traffic, Rouler blocks it rather than sending it elsewhere, so ruled traffic never leaks out another interface.

Low overhead

The installer is 4.3 MB; minimised to the system tray it settles to about 15–20 MB of memory within 30 seconds. Uploads run at full speed even on a 2.5 Gb/s connection, and added latency is described as too small to measure.

How It Works

Rules are applied just before Windows routes traffic

A rule matches an app (optionally narrowed to a destination IP or subnet) and sends it out the interface you pick. Traffic without a rule goes through normal Windows routing; Rouler never edits the route table.

Interface reachability is respected

Each interface's own routes still decide what it can reach — an interface with a default route (0.0.0.0/0) can carry any traffic, while one with only a narrow route (e.g. Tailscale for 10.0.0.0/20) can only be used for that subnet. You can run as many interfaces as you like as long as their routes d

Custom Windows driver, minimal interference

Rouler's Rust-written network driver applies rules at the interface level with no system hooks, virtual adapters, user-mode proxy or custom NAT, building on what already ships in Windows. Every action Rouler takes is visible in the app.

Pros & Cons

Pros

Not tied to a specific VPN client — works with any interface Windows has, so WireGuard, Tailscale, Mullvad, OpenVPN and AmneziaWG can run together
Rule granularity covers apps, destination IPs/subnets, and Windows services, and one app can use different interfaces per destination
Minimal-interference design: no virtual adapters, user-mode proxy, custom NAT or route-table edits, and nothing intended to trip game anti-cheat
Transparency — every action Rouler takes is shown in the app, plus a live activity view of every connection and its outcome
Very lightweight: 4.3 MB installer, roughly 15–20 MB RAM minimised, full-speed uploads on 2.5 Gb/s connections

Who It's For

Best for

Technical Windows users who want per-app or per-subnet control over which VPN or interface traffic uses
People running multiple VPNs at once — e.g. a privacy VPN, Tailscale and a work VPN — without them fighting each other
Gamers who want specific apps routed through a VPN without installing heavy overlay-style software or risking anti-cheat conflicts
Users who dislike system-wide utilities that interfere with everything and want a tool that only touches explicitly ruled traffic

Not ideal for

Non-technical users — the beta is aimed at people comfortable with IP addresses, route tables and VPN configs

Use Cases

Routing specific apps (e.g. Firefox) through a privacy VPN like Mullvad while everything else uses the normal connection

Sending work apps or specific subnets through a work tunnel or Tailscale while other traffic stays on the default route

Running several VPN clients side by side, e.g. Mullvad, Tailscale and a work VPN at the same time

Directing background Windows services through the interface you choose

Creating rules on the fly from live connections in the activity view

Pricing

Rouler is currently free as a public beta (beta keys are emailed, with limited places and a waitlist once full). The release version will be paid: for a personal licence, the developer is planning a $79 USD one-off licence with 2 years of updates, or a $39 USD yearly subscription with updates while active. Business licences will be subscription only, priced later.

Free public beta

Beta key and download link by email; places are limited, with a waitlist once full. Only the beta is free.

Personal licence (planned, one-off)

$79 USD one-off

Planned release pricing: a one-off licence with 2 years of updates. Pricing isn't final yet.

Personal subscription (planned)

$39 USD / year

Planned release pricing: yearly subscription with updates for as long as it's active. Pricing isn't final yet.

FAQ

What is Rouler?

Rouler is split tunnelling for Windows. You choose which network interface each app uses — a privacy VPN for your browser, a work tunnel for work apps, your normal connection for everything else — and they all run at the same time.

Does Rouler work with my VPN client?

Rouler works with network interfaces, so it isn't tied to a particular VPN. It works with the official WireGuard client, Tailscale, Mullvad, OpenVPN or AmneziaWG, and several can run side by side. If Windows has an interface for it, Rouler can send traffic over it, and there's nothing to import.

Will it be free?

Only the beta is free. The release version will be paid.

How much will it cost?

Rouler