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modpack

Factory in the Sky 4Minecraft modpack for 1.21.1

You wake up and find yourself on a skyblock tree, surrounded by the void. What comes next? Inspired by Sky Factory!

newest supported release 1.21.1MagicMultiplayerQuestsSkyblock
Latest version
Factory in the Sky 4 - 1.6
Minecraft
1.21.1
Java
Java 21+
Loader
NeoForge
Licence
not stated
Downloads
19.1k
Updated
6 mo ago
Available on
CurseForge
Space NodeOur hosting

Host Factory in the Sky 4 servers

One click and Factory in the Sky 4 is installed with the right loader, on hardware built for it.

  • 1.21.1
  • NeoForge
  • One click modpack install
  • Dependencies handled
  • Tuned startup flags
  • 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 Factory in the Sky 4 declares support for, newest first, with the Java runtime that version needs.

Other modpacks
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge21+declared8 Aug 2024

Download

From Factory in the Sky 4’s own host. Nothing is re-hosted here.

Most recently published release

Factory in the Sky 4 - 1.6release9 May 2026

Factory in the Sky 4-1.6.zip · 67.1 MB · for 1.21.1 · NeoForge

Download this release
a6f534c05a6d…
Older versions22
  • Factory in the Sky 4 - 1.5.48 Nov 20251.21.167.0 MB4.0k downloadse749f9b10b1b…Get
  • Factory in the Sky 4 - 1.5.319 Oct 20251.21.167.0 MB668 downloads3a0781970ebf…Get
  • Factory in the Sky 4 - 1.5.223 Aug 20251.21.167.0 MB58 downloads43a3c67de056…Get
  • Factory in the Sky 4 - 1.5.111 Aug 20251.21.167.0 MB67 downloadsd1fb9ce8e858…Get
  • Factory in the Sky 4 - 1.56 Aug 20251.21.167.0 MB166 downloadsd420183714bb…Get
  • Factory in the Sky 4 - 1.4.513 Jul 20251.21.167.0 MB130 downloads89c32c1eed8b…Get
  • Factory in the Sky 4 - 1.4.42 Jul 20251.21.167.0 MB434 downloadse77119092c81…Get
  • Factory in the Sky 4 - 1.4.312 Jun 20251.21.166.9 MB324 downloadsaa8136e17b77…Get
  • Factory in the Sky 4 - 1.4.230 May 20251.21.166.9 MB134 downloads704296ef077d…Get
  • Factory in the Sky 4 - 1.4.126 May 20251.21.166.9 MB136 downloads89a55417f13c…Get
  • Factory in the Sky 4 - 1.424 May 20251.21.166.9 MB161 downloads500a5b1afa0a…Get
  • Factory in the Sky 4 - 1.3.220 May 20251.21.166.9 MB175 downloads8cb37f29f338…Get
  • Factory in the Sky 4 - 1.3.112 May 20251.21.166.9 MB305 downloads41db9e5f2b6c…Get
  • Factory in the Sky 4 - 1.311 May 20251.21.166.9 MB115 downloads1336d6f30379…Get
  • Factory in the Sky 4 - 1.2.210 May 20251.21.166.9 MB243 downloadsb7e97ae194e8…Get
  • Factory in the Sky 4 - 1.2.18 May 20251.21.166.9 MB211 downloads7469663ab5fd…Get
  • Factory in the Sky 4 - 1.27 May 20251.21.166.9 MB204 downloads0a26ea30833f…Get
  • Factory in the Sky 4 - 1.1.26 May 20251.21.166.9 MB176 downloads076d5616b50a…Get
  • Factory in the Sky 4 - 1.1.12 May 20251.21.166.9 MB283 downloads016551a62d92…Get
  • Factory in the Sky 4-1.130 Apr 20251.21.166.9 MB183 downloads002e206fb458…Get
  • Factory in the Sky 4 - 1.0.127 Apr 20251.21.166.9 MB275 downloads6a9b8e2fc594…Get
  • Factory in the Sky 4 - 1.026 Apr 20251.21.166.9 MB155 downloads215c044582fc…Get

Frequently asked

Does Factory in the Sky 4 work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Factory in the Sky 4 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 platform or loader does Factory in the Sky 4 support?

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 Factory in the Sky 4?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

How do I install Factory in the Sky 4?

Use a launcher that imports packs, such as Prism Launcher, the Modrinth App or the CurseForge app, and open the pack file with it. The launcher installs the right loader and mods for you; installing a pack's mods by hand is the error-prone way.

Where do I download Factory in the Sky 4 safely?

Start with the author's page on CurseForge, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available 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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Details from CurseForge, where the author last updated it on 9 May 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .