The Modrinth App is Modrinth’s own first-party launcher for managing modded Minecraft - install a modpack in a couple of clicks and it handles the mods, versions, and Java for you. It’s fast and clean, but it shares the same limitation as every other launcher: the world save lives on one player’s machine.

When you play modded Minecraft together through “Open to LAN,” the world only exists while the host is online. A dedicated server fixes availability but costs money and needs maintenance. This guide covers where the Modrinth App keeps your worlds, whether it can host a server, and how to share saves so anyone can host.

Can the Modrinth App Host a Server?

No - the Modrinth App is a client launcher, not a server host. It manages your instances, mods, and versions, but it doesn’t run a dedicated server. So when people look for “Modrinth App server hosting,” what they actually need is one of these:

  • Open to LAN - launch a world, press Esc -> Open to LAN, and friends on your network join. Simple, but it only runs while your game is open.
  • A separate dedicated server - stand up a standalone modded server with the same mods, running outside the launcher. That means paying for or maintaining a 24/7 machine.
  • Save sharing - skip the server: pass the world save between players so whoever’s around can host it locally. That’s the approach this guide covers.

Where Does the Modrinth App Save Worlds?

The Modrinth App organizes everything by profile (its term for an instance). On Windows, your worlds live at:

%APPDATA%\ModrinthApp\profiles\<ProfileName>\saves\<WorldName>\

Note the difference from launchers like Prism or CurseForge: the Modrinth App uses a profiles\ folder and there’s no .minecraft\ layer - saves sit directly under the profile. The quickest way there: in the app, click the three-dots menu next to an instance’s Play button and choose “Open folder,” then open the saves subfolder. Each world is its own folder with level.dat and the region chunk data.

If you upgraded from an older build, the data folder may still be named com.modrinth.theseus instead of ModrinthApp - it was renamed in v0.8.0.

How SaveSync Bridges the Gap

SaveSync synchronizes your Minecraft world save across every player in your group. When the host finishes a session, SaveSync pushes the save to everyone. Next time, whoever’s around loads the world locally and opens it to LAN for the rest. No server, no monthly fees - just shared worlds.

How to Set Up SaveSync for the Modrinth App

  1. Install SaveSync from Steam. Every player needs it.
  2. Create a sync group and invite your Minecraft friends.
  3. Locate your world folder (%APPDATA%\ModrinthApp\profiles\<ProfileName>\saves\, via the three-dots menu -> “Open folder”). Point SaveSync at the world you want to share.
  4. Play normally. Host through Open to LAN.
  5. SaveSync syncs the world to everyone when the session ends.
  6. Anyone can host next time from their own Modrinth App profile.

Why Use SaveSync Instead of a Dedicated Server

  • No hosting fees. A modded server with enough RAM runs $10-20/month or more. SaveSync is a one-time purchase.
  • Nothing to administer. No updates, uptime, or backups to babysit.
  • Matching mods stay simple. Everyone installs the same Modrinth modpack in their own profile and runs it locally - no client-vs-server version mismatches.
  • Right-sized for friends. For two or three people sharing a world, a dedicated server solves a problem you don’t have.

For large public servers, dedicated hosting still makes sense. For a friend group with a shared modded world, SaveSync is simpler and cheaper.

Your Modded World, Available to Everyone

The Modrinth App already makes modded Minecraft painless to set up. SaveSync adds the missing piece - making sure the world itself isn’t trapped on one player’s machine. Share the save, share the hosting, and keep building.