Menu

modpack

OptiCoolMinecraft modpack for 1.21.5

OptiCool is a modpack related to optimization/fix improvements and features from OptiFine!

client onlynewest supported 1.21.5Optimization
Latest version
1.0B1
Minecraft
b1.7.3 to 1.21.5
Java
Java 21+
Loaders
Quilt, Fabric, NeoForge
Licence
Apache-2.0
Downloads
5.8k
Updated
13 mo ago
Available on
Modrinth
Space NodePartner

Host OptiCool servers

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

  • 1.21.5
  • Quilt
  • Fabric
  • 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 OptiCool declares support for, newest first, with the Java runtime that version needs.

Other modpacks
MinecraftThroughJavaEvidenceReleased
1.21.5Quilt, Fabric, NeoForge21+declared25 Mar 2025
1.21NeoForge, Fabric, Quilt21+declared13 Jun 2024
b1.7.3Fabric, Quilt, NeoForge8+declared7 Jul 2011

Download

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

All 26 releases
1.0B1release23 Jun 2025

OptiCool 1.0 B1.mrpack · 13.5 MB · for 1.21.5

Download latest
617383fb3b69…
Older versions24
  • Quilt1.0B123 Jun 20251.21.513.5 MB35 downloads1f6fca123afe…Get
  • NF1.0B123 Jun 20251.21.50.1 MB78 downloads88e12aa3c4a0…Get
  • 1.0B1pre223 May 20251.21.513.4 MB133 downloadsb2f9efe544b0…Get
  • Quilt1.0B1pre223 May 20251.21.513.4 MB37 downloadsafec5c37dae1…Get
  • 1.0B1pre121 May 20251.21.50.1 MB31 downloads5305888bfca3…Get
  • Plus1.0A524 Jul 20241.210.9 MB796 downloads14824b99f2cd…Get
  • 1.0A524 Jul 20241.210.9 MB120 downloadsb6d26a6fa743…Get
  • QuiltPlus1.0A524 Jul 20241.210.9 MB56 downloads5800c56d264b…Get
  • Quilt1.0A524 Jul 20241.210.9 MB45 downloads0b20676721d0…Get
  • b1.7.3plus_a1_1.0.016 Jul 2024b1.7.332.7 MB2.2k downloads334c7e0251de…Get
  • b1.7.3a1_1.0.016 Jul 2024b1.7.332.7 MB542 downloadsec507922584f…Get
  • Plus1.0A415 Jul 20241.211.6 MB56 downloads9f6928930aba…Get
  • 1.0A415 Jul 20241.211.6 MB60 downloads016ee1f479dd…Get
  • QuiltPlus1.0A415 Jul 20241.211.6 MB42 downloadsc2441fd4d8a8…Get
  • Quilt1.0A415 Jul 20241.211.6 MB43 downloads043c4c924293…Get
  • Plus1.0A313 Jul 20241.211.6 MB54 downloadsad1d50636505…Get
  • 1.0A313 Jul 20241.211.6 MB51 downloads61e04d215ec3…Get
  • QuiltPlus1.0A313 Jul 20241.211.6 MB43 downloads837c60969d18…Get
  • Quilt1.0A313 Jul 20241.211.6 MB46 downloads95b0abbbbac5…Get
  • NFPlus1.0A113 Jul 20241.213.1 MB78 downloads9d2e9a280824…Get
  • NF1.0A113 Jul 20241.213.1 MB63 downloads724e49ca5151…Get
  • Plus1.0A213 Jul 20241.211.6 MB44 downloadsb7c8caf14c30…Get
  • 1.0A213 Jul 20241.211.6 MB43 downloads9778796b665a…Get
  • Plus1.0A111 Jul 20241.214.5 MB40 downloads70ee878a943a…Get

Frequently asked

Does OptiCool work on Minecraft 1.21.5?

Yes. 1.21.5 is the newest Minecraft version OptiCool 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 OptiCool support?

Everything the author has declared, from b1.7.3 up to 1.21.5. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install OptiCool on the client or the server?

The client only. There is nothing to install on the server, so it works on any server you can already join.

Which loader does OptiCool need?

Quilt, Fabric, NeoForge. 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 OptiCool?

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 modpack itself.

What licence is OptiCool under?

Apache-2.0, 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 OptiCool?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the modpack 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 OptiCool safely?

From the author's own page on Modrinth, 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.

Re-ConsoleA continued Legacy Console Edition experience, expanded upon with modern Java Edition content and QoL! (An Official Legacy4J Project)MAX FPS: Optimized🚀 MAX FPS WITHOUT UNNECESSARY MODS! Only 16 optimization mods - NOTHING EXTRA! ✅ ALL MAJOR VERSIONS ⚡ INSTALLS ON ANY LAUNCHER! (Guide below)PacktrixPre-packed Official Modpack containing Patrix Resource Pack for easy install using Fabric/Quilt.Simply Optimized ReloadedAn unofficial port of Simply Optimized built to support every major mod loader and stay current with the newest versions of Minecraft.OptimumFuse[1.21.5] [Fabric📜] An open-source modpack that improves the game's performance and visuals, inspired by OptiFine, while staying true to the vanilla Minecraft experience.ElixirA well-researched performance & optimization modpack to make the game run smoother! With shader & Fresh Animations support. 26.3 Snapshot 5 ✔

Last checked 6 d 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? .