Seamless - Serverless Multiplayer

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Seamless - Play Together, Effortlessly

Tired of complicated server setups? Seamless transforms multiplayer gaming by eliminating the technical headaches. No port forwarding nightmares, no router configuration struggles – just pure gaming fun with your friends!

What Makes Seamless Special?

Seamless revolutionizes how you play Minecraft with friends by bringing server hosting directly into your game. Using cutting-edge P2P technology, it automatically establishes connections between players, even when both are behind NAT or firewalls. Say goodbye to technical barriers and hello to instant multiplayer!

Key Features

One-Click Server Hosting

Launch a multiplayer server directly from Minecraft – no separate server software, no console commands, no complexity. Just click "Host Server" and you're ready to play!

Automatic Port Forwarding

Forget about router configuration! Seamless automatically handles port forwarding using UPnP technology. If automatic setup isn't possible, you'll get clear, easy-to-follow instructions.

Smart Invite System

Share a simple 6-digit code instead of complicated IP addresses. Your friends can join in seconds by entering the code – it's that simple!

Integrated Friend Management (Coming Soon)

Manage your friends directly in-game with real-time status updates and persistent friend lists.

Advanced P2P Connections

Modern networking technology that works even behind NAT and firewalls. Direct peer-to-peer connections with automatic fallback to relay servers if needed.

Mod Compatibility Checker

Never join an incompatible server again!

• Automatic mod detection on host and client
• Pre-join compatibility checks – see warnings before connecting
• Prevent crashes caused by mod mismatches
• Clear mod requirement lists for easy troubleshooting

Real-Time Session Management

• Live player counts and session status
• Automatic session cleanup after 1 hour of inactivity
• Session restoration – rejoin seamlessly after disconnects

Cross-Platform Support

Works with both Fabric AND NeoForge – same great features, same smooth experience, your choice of mod loader!

Quick Start Guide

Hosting Your First Server

1. Open the game menu
2. Click "Server"
3. Hit "Start Server"
4. Share your invite code or server address with friends
5. Start playing together! 🎉

Joining a Friend's Server

Currently, joining works via 6-digit invite codes:

1. Get the code from your friend hosting the server
2. Open the join menu in Seamless
3. Enter the 6-digit code
4. Connect instantly!

Note: The friend list feature is currently in development. For now, use invite codes to join servers.

🔧 Technical Details

Network Architecture

• Standard Minecraft protocols with automatic port detection
• Multi-tier connection strategy (direct → hole-punch → relay)
• RFC 5389-compliant STUN client implementation

P2P Technology

• STUN servers for NAT traversal
• UDP hole punching for firewall bypass
• TCP-over-UDP tunneling with automatic fallback

Data Storage

• Friend lists: config/seamless/friends.json
• Server settings: Local configuration files

Community & Support

Need help? Have suggestions? Found a bug?

• Report issues on CurseForge
• Leave comments on CurseForge – i read every message!
• Share your experience – help me improve Seamless

Currently in Development

The following items reflect the current direction of development. These are planned features, not guarantees. Stability comes first.

Core improvements

• In-game friends menu
• Inviting friends directly without links
• Minimal UI with no social features
• No accounts, cosmetics, shops, or external services
• Calm behavior without spam notifications
• Focus on hosting and joining only

Multiplayer and co-op features

• Basic multiplayer commands
• Host-only permissions
• Session-based commands like kick, invite, and lock session
• Clear host indication
• Better session lifecycle handling
• Optimized for small groups
• Target: stable sessions with up to 8 players

Mod and Voice support

• Improved modpack compatibility
• Support for common mod setups
• Simple Voice Chat compatibility

Versions

Planned support for additional versions:

• 1.21.4
• 1.21
• 1.20.4
• 1.20.1
• 1.19.2
• 1.12.2
• 1.7.10

The focus is on supporting the most important versions first, with others coming later.

Modpacks

Seamless is explicitly allowed to be used in modpacks.