Settings

Settings

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Appearance / Theme

• Dark / Light / Auto — follows the system by default, or force one.
• Accent color and compact / UI scale options.

Connection mode

• TUN mode — a virtual adapter captures all system traffic. Works for every app with no per-app setup; needs the helper service. Recommended.
• System-proxy mode — SlothClash sets the OS proxy to its local mixed port. Lighter, but only proxy-aware apps are covered (many games / native apps ignore it).

TUN options

• Stack — how the tunnel processes packets:
  • gVisor (default) — userspace stack; the most reliable choice and best under UDP-heavy load.
  • system — the OS kernel stack; can stall on wintun under heavy UDP on some setups.
  • mixed — gVisor for TCP, system for UDP.
• MTU — leave empty to inherit. If UDP-heavy protocols (Hysteria2, TUIC) or apps stall while TCP works, try lowering it (e.g. 1408).
• Route-exclude-address — keep specific ranges off the tunnel (e.g. to coexist with a split-tunnel corporate VPN).

DNS

SlothClash ships upstream-parity DNS defaults so lookups keep working on hostile networks:

• fake-ip mode with a sensible fake-ip-filter (captive-portal / NTP / *.lan resolve for real).
• Smart DNS fallback (off by default) — when on, proxied domains resolve through the proxy, so your ISP neither sees nor can poison those lookups; direct domains stay local.
• Enable IPv6 DNS (off by default) — off avoids broken IPv6 dials on IPv4-only networks. On, a v6 fake-ip pool is configured automatically so AAAA lookups actually resolve.
• Allow LAN binding (off by default) — off keeps the proxy on localhost. On, other devices in your network can use this machine as a proxy; a loopback bind-address from the profile is rewritten so it really works.
• A plain-UDP resolver is included alongside DoH/DoT, so DNS survives networks that block encrypted DNS ports.

You can still override the dns: block per profile if you know what you need.

Startup

• Launch on startup — start SlothClash with the OS.
• Start minimized — open straight to the tray.
• Auto-connect on startup — bring the core up automatically when the app launches.

Helper service

TUN needs a privileged helper service, installed on first run. If the app and the service versions drift, SlothClash shows an update-service banner — follow it to keep them in sync.

Updates

• Check for updates — manual check; updates are verified with a minisign signature before install.
• A badge appears when a new release is available.

Related

• Getting Started
• Routing & Rules
• Troubleshooting