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Cobblemon Delta icon

Cobblemon Delta

Fabric modpack for Minecraft 1.21.1 by ItsJustChris

Get it on Modrinth Full mod list (59)

Cobblemon Delta runs on Minecraft 1.21.1 with Fabric. It has 53 mods, needs about 6 GB of RAM (our estimate) and runs on both client and server. The latest version is 4.5.2, released Nov 7, 2026.

Minecraft version
1.21.1
Mod loader
Fabric
Mods
53
RAM to allocate
6 GB (estimate)
Runs on
Client, server optional
Latest version
4.5.2 ()
Downloads
1.7M (#15)
First released
Pack file size
132.4 MB
License
All Rights Reserved

What is Cobblemon Delta?

Cobblemon Delta is a Fabric modpack for Minecraft 1.21.1, published by ItsJustChris on Modrinth since 2023.

The latest release, 4.5.2 from Nov 7, 2026, declares 53 mods plus 6 other projects such as resource packs or shaders. Across 116 published versions it has covered Minecraft 1.20.1 through 1.21.1.

With 1.7M downloads it ranks #15 of the 518 most-downloaded Modrinth modpacks we track, and its authors tag it as adventure and lightweight.

Our notes on Cobblemon Delta

What sets it apart

Cobblemon Delta is two things that are easy to confuse: a light Cobblemon modpack, and the client for a specific public server.

The pack itself is modest. The latest mod list has Cobblemon, a Sodium and Lithium performance base, Xaero’s minimap and world map, Roughly Enough Items, Jade, Simple Voice Chat, Emotecraft, several shader packs through Iris, and a handful of Cobblemon resource packs.

The headline features in the description (raids, gyms, dungeons, towns, a global trade system, tournaments, a battle frontier) are listed as features of the Cobblemon Delta server. They are not something the download adds to a private world.

The pack also ships DeltaClient, a mod that is not hosted on Modrinth. The CurseForge page describes it as a client-side mod used for the Delta server.

Who it suits

Players who want to join the Cobblemon Delta community server with a client already set up for it. As a general Cobblemon pack for a private world, it offers less content than packs that add their own structures, quests or add-ons.

Before you install

Fabric only. The active line is Minecraft 1.21.1, and it is updated often. Most recent releases in the changelog say only that DeltaClient was updated. A 1.20.1 line exists but has not been updated since October 2024.

The Cobblemon version is stated inconsistently. The description says 1.7.3, while the October 2026 release notes say the pack moved to Cobblemon 1.8.4. The changelog is the more recent of the two.

The authors recommend setting memory to 4 GB and describe the pack as suitable for low-end hardware. They publish no measurements.

Vivecraft is in the mod list, so VR support is bundled.

Playing with friends

The intended route is the official server, whose address is given on the project page and reached through the multiplayer menu.

Modrinth marks the server side as optional. Neither the Modrinth nor the CurseForge page lists a server pack, and neither explains how to host a private server with the same mods. Single-player use is also not addressed on either page.

Friends who want a private Cobblemon world together should treat self-hosting with this pack as undocumented.

Written from public sources, not from hands-on testing. Sources: Modrinth project page, Modrinth changelog, CurseForge project page. See our editorial policy.

Most widely used mods in Cobblemon Delta

The latest version declares 59 projects, 53 of them mods. The ones below appear in the most packs we track.

  • 25 run on client and server
  • 27 client only
  • 1 server only

Full Cobblemon Delta mod list

5 more files are bundled inside the pack without a Modrinth project, so we cannot name them.

How its mod list compares

Less common picks: 2 mods found in five or fewer tracked packs.

Packs with the most mods in common

What kinds of mods are in Cobblemon Delta?

Of its 53 mods, 29 are tagged utility, 13 library and 10 decoration. Mods can carry several tags, so the counts overlap.

At 9% social, that is a larger share than 93% of the 491 packs we track.

  • utility: 29 (55%)
  • library: 13 (25%)
  • decoration: 10 (19%)
  • adventure: 7 (13%)
  • optimization: 7 (13%)
  • social: 5 (9%)

How big is Cobblemon Delta?

With 53 mods, Cobblemon Delta has more mods than 51% of the 491 packs we track and fewer mods than 63% of the 86 on Minecraft 1.21.1.

The pack file is 132.4 MB. 27 mods are client-only and 26 also run on a server. Alongside the mods it declares 6 shaders.

How actively is Cobblemon Delta updated?

Cobblemon Delta was first published on Oct 16, 2023, and has 116 published versions in total.

The latest release, 4.5.2, is dated Nov 7, 2026, 4 days before our data was fetched on Nov 11, 2026. Releases have covered 2 Minecraft versions over 3.1 years.

Staple mods Cobblemon Delta includes and leaves out

Across the 325 Fabric packs we track, 15 mods turn up most often. Cobblemon Delta includes 12 of them; it leaves out ImmediatelyFast, Sodium Extra and Reese's Sodium Options.

How much RAM does Cobblemon Delta need?

Cobblemon Delta needs 6 GB allocated (4 GB minimum). Our estimate from the 53-mod list, not measured.

How to set allocated memory

How to install Cobblemon Delta

Search for "Cobblemon Delta" in the Modrinth source of your launcher. Pick version 4.5.2 for Minecraft 1.21.1 (Fabric). Modpack install guide.

How do I make a Cobblemon Delta server?

Cobblemon Delta is marked as supporting a server-side install, so the server must run the same mods and version as the players.

  • Match the version: the latest pack version is 4.5.2 for Minecraft 1.21.1.
  • Loader: Fabric.
  • Memory: at least 4 GB (our estimate).

Modpack server guide.

Versions

Newest build for each of 2 Minecraft version and loader pairs.

MinecraftLoaderPack versionReleased
1.21.1Fabric4.5.2
1.20.1Fabric1.2.12