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ObservableMinecraft mod for 1.21.4

See what's lagging your server.

newest supported 1.21.4Server UtilityMap Information
Latest version
5.4.4 (neoforge)
Minecraft
1.16.5 to 1.21.4
Java
Java 21+
Loaders
Forge, NeoForge, Fabric, Quilt
Licence
not stated
Downloads
47.5M
Updated
15 mo ago
Available on
CurseForge
Space NodePartner

Host Observable servers

One click and Observable is installed with the right loader, on hardware built for it.

  • 1.21.4
  • Forge
  • NeoForge
  • Fabric
  • Quilt
  • 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 Observable declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.4Forge, NeoForge, Fabric, Quilt21+declared3 Dec 2024
1.21.1Fabric, Quilt, NeoForge, Forge21+declared8 Aug 2024
1.21Quilt, NeoForge, Fabric, Forge21+declared13 Jun 2024
1.20.1NeoForge, Fabric, Quilt, Forge17+declared12 Jun 2023
1.19.3NeoForge, Fabric, Quilt, Forge17+declared7 Dec 2022
1.19.2NeoForge, Fabric, Quilt, Forge17+declared5 Aug 2022
1.18.2NeoForge, Fabric, Quilt, Forge17+declared28 Feb 2022
1.18.1NeoForge, Fabric, Quilt, Forge17+declared10 Dec 2021
1.17.1Forge, NeoForge, Fabric, Quilt16+declared6 Jul 2021
1.16.5NeoForge, Fabric, Quilt, Forge8+declared14 Jan 2021

Download

From Observable’s own host. Nothing is re-hosted here.

All 40 releases
5.4.4 (neoforge)beta26 Jun 2025

observable-5.4.4.jar · 0.4 MB · for 1.21.1

Download latest
e17417eee213…
Older versions24
  • 5.4.4 (fabric)26 Jun 20251.21.10.4 MB287a8bcee323…Get
  • 7.4.4 (neoforge)8 Apr 20251.21.40.4 MB92 downloads1ca674ea2eea…Get
  • 7.4.4 (fabric)8 Apr 20251.21.40.4 MB383 downloads5a7807166def…Get
  • 7.4.3 (neoforge)6 Apr 20251.21.40.4 MB16 downloadsa90dbe796308…Get
  • 7.4.3 (fabric)6 Apr 20251.21.40.4 MB16 downloads702b71acbc44…Get
  • 5.4.3 (neoforge)18 Sept 20241.21, 1.21.10.4 MB3.0M downloads2e9fb3c57186…Get
  • 5.4.3 (fabric)18 Sept 20241.21, 1.21.10.4 MB7.8k downloads0e473445795f…Get
  • 5.4.2 (neoforge)16 Sept 20241.21, 1.21.10.4 MB1.7k downloads96b72a8305fe…Get
  • 5.4.2 (fabric)16 Sept 20241.21, 1.21.10.4 MB92 downloads3b5680bcc686…Get
  • 4.4.2 (forge)19 Aug 20241.20.10.4 MB1.5M downloadsc8a0ae25512d…Get
  • 4.4.2 (fabric)19 Aug 20241.20.10.5 MB4.3k downloads725d6ae05f78…Get
  • 4.4.1 (forge)4 Feb 20241.20.10.5 MB5.9M downloadsbd44f1fd4eab…Get
  • 4.4.1 (fabric)4 Feb 20241.20.10.5 MB563.4k downloads363aeb6f8e7e…Get
  • 4.4.0 (forge)4 Sept 20231.20.10.5 MB2.0M downloadsc459db1219cf…Get
  • 4.4.0 (fabric)4 Sept 20231.20.10.5 MB38.3k downloadsce6132431198…Get
  • 4.3.3 (forge)31 Aug 20231.19.30.5 MB283 downloads1054c350abab…Get
  • 4.3.3 (fabric)31 Aug 20231.19.30.5 MB375 downloads2f5f2095a8cd…Get
  • 4.3.1 (forge)25 Dec 20221.19.30.5 MB3.9k downloadsc534d8004627…Get
  • 4.3.1 (fabric)25 Dec 20221.19.30.5 MB82.4k downloadsd2aa829a6ac2…Get
  • 3.3.1 (forge)18 Dec 20221.19.20.5 MB4.2M downloads83cbc1e82202…Get
  • 3.3.1 (fabric)18 Dec 20221.19.20.5 MB291.9k downloadsc4264c72f638…Get
  • 3.3.0 (forge)7 Nov 20221.19.20.5 MB380.8k downloadscfb4b4b3f750…Get
  • 3.3.0 (fabric)7 Nov 20221.19.20.5 MB38.3k downloads2880000039e4…Get
  • 2.2.3 [fabric]11 Apr 20221.18.29.1 MB699.3k downloadsd5682dc84b2a…Get

Frequently asked

Does Observable work on Minecraft 1.21.4?

Yes. 1.21.4 is the newest Minecraft version Observable 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 Observable support?

Everything the author has declared, from 1.16.5 up to 1.21.4. The full list is in the table above, with the Java runtime each version needs next to it.

Which loader does Observable need?

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

Which Java version do I need for Observable?

Java 21 or newer, because that is what the newest Minecraft release it supports requires. The requirement comes from the game rather than from the mod itself.

How do I install Observable?

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 Observable safely?

From the author's own page on CurseForge, which is where the data here is synced from. MCReference never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

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 1 mo ago against CurseForge. 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? .