SHARE
Turn any instance into a shared pack from its Sharing page. Invite friends by link or by Modrinth username. Pending invites show up right inside the launcher.
ONE PERSON UPDATES THE PACK. EVERYONE JUST PLAYS.
Portal keeps your whole friend group's modpack in sync. Share an instance, push an update, and every copy reconciles before launch: mods, configs, even loader versions. Built on Prism Launcher, powered by Modrinth Shared Instances.
Free and open source under GPL-3.0. No ads, no telemetry. And your friends can keep using the Modrinth App.
EVERY SHARED PACK
DIES THE SAME WAY.the group chat, 9:47 pm
“IT SAYS MY VERSION
DOESN’T MATCH.”
“DID YOU GET
THE NEW ZIP?”
TWENTY MINUTES OF FIXING.
ZERO MINUTES OF PLAYING.
THERE’S A WAY THROUGH.keep scrolling
SHARE ONCE.
STAY IN SYNC FOREVER.
Portal builds Modrinth’s Shared Instances service directly into the launcher. You host the pack. Everyone else’s copy quietly keeps up.
PUSH
Add mods, tweak configs, bump the Minecraft or loader version. When it plays the way you want, push the update once. Modrinth-hosted mods sync by reference, so pushes are fast.
PLAY
Friends just press Play. Their copy syncs first, and they see a changelog of exactly what changed before the game starts. Mods they added themselves are never touched.
YOUR FRIENDS DON’T NEED PORTAL.
Portal talks to Modrinth’s real Shared Instances service, so it is fully interoperable: friends can join your pack from the official Modrinth App without installing anything new. You install Portal. Nobody else has to do anything.
Same service, same packs. Your friends never have to think about it.
OVERLY POLISHED.
ON PURPOSE.
Portal inherits everything great about Prism Launcher, then fixes the hundred small things you notice every day.
FRIENDS,
BUILT IN
See who’s online and what they’re playing. Join a friend’s pack in one click, send invites by username, get notified inside the launcher.
MOD PAGES
WORTH READING
Galleries, download stats, and changelogs right in the mod browser. Know what you’re installing before you install it.
ONE-CLICK
ROLLBACK
Bad mod update? Revert Last Mod Update restores the previous versions from an automatic snapshot. No re-downloading, no guessing.
PACKS SHIP
43% SMALLER
Resource and data packs are losslessly optimized on push. Measured on real packs. Identical in game, faster for everyone.
SERVERS
AT A GLANCE
The Servers page shows live ping, MOTD, and player counts without booting the game.
FAST WHERE
IT COUNTS
A content-addressed cache means files you already have never download twice. Parallel uploads and an optimized Java GC preset out of the box.
AND THE
REST
The small stuff adds up.
DON’T TRUST IT.
VERIFY IT.
The Minecraft launcher category is full of malware, and you should be suspicious of every exe on the internet, including this one. So Portal is built to be checked, not believed.
$ gh attestation verify PortalLauncher-Setup-1.0.5.exe \ --repo Portal-Launcher/PortalLauncher ✓ Verification succeeded! # prefer checksums? every release ships those too $ sha256sum -c PortalLauncher-Setup-1.0.5.exe.sha256
BUILT IN PUBLIC
Every line of source is on GitHub under GPL-3.0. The binaries are built from it by GitHub Actions, not on someone’s laptop.
PROVABLE BUILDS
Every release ships sha256 checksums. From 1.0.6 onwards, releases carry GitHub build provenance attestations tying each file to its source commit.
YOUR PASSWORD STAYS YOURS
Minecraft sign-in is Microsoft’s official OAuth. Modrinth sign-in is Modrinth’s browser OAuth. Portal never sees or stores a password.
NOTHING PHONES HOME
No telemetry, no analytics, no ads. The launcher talks to Microsoft, Modrinth, and CurseForge. That’s it.
Honest note: Windows SmartScreen may warn on new releases until code signing reputation builds. That’s exactly why the attestations exist.
STEP
THROUGH.
Version 1.0.5. Free forever. Your Prism instances carry over automatically.
Every download has a .sha256 checksum next to it on the releases page. Requires a genuine Minecraft account.
QUESTIONS,
ANSWERED HONESTLY.
Is Portal Launcher free?
Yes. Free and open source under GPL-3.0. No ads, no telemetry, no paid tiers. The only account it uses is the Microsoft account you already sign into Minecraft with, plus an optional Modrinth sign-in for sharing features.
Do my friends need Portal to join my modpack?
No. Portal uses Modrinth’s official Shared Instances service, so friends can join from the official Modrinth App without installing anything new. Only the host needs Portal.
Is it safe to download?
The source is public, releases are built by GitHub Actions, and every release ships sha256 checksums, with build provenance attestations from 1.0.6 onwards that you can verify with the GitHub CLI. Sign-in is Microsoft’s official OAuth, so Portal never sees your password. SmartScreen may still warn on new releases until signing reputation builds; verify the attestation instead of trusting the popup either way.
Does it work with CurseForge modpacks?
Yes, Portal browses and installs both Modrinth and CurseForge content. One caveat when sharing: mods hosted on Modrinth sync by reference instantly, while files from other sources re-upload on each push. The official Modrinth App has the same constraint.
Can I switch from Prism Launcher without losing anything?
Yes. Portal reads the same data folder as Prism, so instances, accounts, and settings carry over automatically the first time you open it. Your Prism install keeps working too.
How is this different from the Modrinth App?
Same sharing service underneath, deliberately, so they interoperate. The difference is Prism-grade instance management, CurseForge support, and the quality of life features. If you’re already happy in the Modrinth App, honestly, stay there. Your friends on Portal can still share packs with you.
Do I need to own Minecraft?
Yes. Portal requires a genuine Minecraft account through Microsoft’s official login. There is no offline or alternative authentication, by design.