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Seamless - Serverless MultiplayerMinecraft mod for 1.21.11

Play together instantly. No server needed. Host your singleplayer world and invite friends in seconds.

client and servernewest supported 1.21.11Game MechanicsOptimizationManagementSocial
Latest version
1.1.8
Minecraft
1.21.1 to 1.21.11
Java
Java 21+
Loaders
Quilt, Fabric, NeoForge
Licence
LicenseRef-All-Rights-Reserved
Downloads
23.4k
Updated
7 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Seamless - Serverless Multiplayer servers

One click and Seamless - Serverless Multiplayer is installed with the right loader, on hardware built for it.

  • 1.21.11
  • Quilt
  • Fabric
  • NeoForge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Seamless - Serverless Multiplayer declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.11Quilt, Fabric, NeoForge21+declared9 Dec 2025
1.21.10NeoForge, Fabric, Quilt21+declared7 Oct 2025
1.21.1Fabric, Quilt, NeoForge21+declared8 Aug 2024

Download

From Seamless - Serverless Multiplayer’s own host. Nothing is re-hosted here.

1.1.8beta3 Mar 2026

seamless-neoforge-1.21.11-1.1.8.jar · 3.8 MB · for 1.21.11

Download latest
0be5bb1d564b…
Older versions5
  • 1.1.517 Feb 20261.21.10.2 MB48 downloads1f27ec4cc91d…Get
  • 1.0.1011 Feb 20261.21.10.2 MB178 downloads2603e6ea2329…Get
  • 1.0.811 Feb 20261.21.100.2 MB24 downloads09f619bd7c02…Get
  • 1.0.57 Feb 20261.21.100.2 MB131 downloads5e32def20836…Get
  • 1.0.05 Feb 20261.21.100.2 MB49 downloads2f0cb5187eba…Get

Frequently asked

Does Seamless - Serverless Multiplayer work on Minecraft 1.21.11?

Yes. 1.21.11 is the newest Minecraft version Seamless - Serverless Multiplayer declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Seamless - Serverless Multiplayer support?

Everything the author has declared, from 1.21.1 up to 1.21.11. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Seamless - Serverless Multiplayer on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does Seamless - Serverless Multiplayer support?

Quilt, Fabric, NeoForge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Seamless - Serverless Multiplayer?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

What licence is Seamless - Serverless Multiplayer under?

LicenseRef-All-Rights-Reserved, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Seamless - Serverless Multiplayer?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Seamless - Serverless Multiplayer safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Last checked 2 mo ago against Modrinth. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .