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Caelus APIMinecraft mod for 1.21.5

A coremod and API to provide developers access to elytra flight mechanics through an entity attribute.

client and servernewest supported release 1.21.5Game MechanicsLibraryTransportation
Latest version
8.0.1+1.21.4
Minecraft
1.13.2 to 1.21.5
Java
Java 21+
Loaders
NeoForge, Forge, Fabric
Licence
LGPL-3.0-or-later
Downloads
6.6M
Updated
15 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Caelus API servers

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

  • 1.21.5
  • NeoForge
  • Forge
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version Caelus API declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.5NeoForge, Forge, Fabric21+declared25 Mar 2025
1.21.4Fabric, NeoForge, Forge21+declared3 Dec 2024
1.21.1Forge, NeoForge, Fabric21+declared8 Aug 2024
1.21Forge, NeoForge, Fabric21+declared13 Jun 2024
1.20.6Forge, NeoForge, Fabric21+declared29 Apr 2024
1.20.4NeoForge, Forge, Fabric17+declared7 Dec 2023
1.20.2NeoForge, Forge, Fabric17+declared20 Sept 2023
1.20.1Fabric, NeoForge, Forge17+declared12 Jun 2023
1.20Forge, NeoForge, Fabric17+declared2 Jun 2023
1.19.4Forge, NeoForge, Fabric17+declared14 Mar 2023
1.19.3NeoForge, Fabric, Forge17+declared7 Dec 2022
1.19.2Forge, Fabric, NeoForge17+declared5 Aug 2022
1.19.1NeoForge, Forge, Fabric17+declared27 Jul 2022
1.19Fabric, NeoForge, Forge17+declared7 Jun 2022
1.18.2Forge, NeoForge, Fabric17+declared28 Feb 2022
1.18.1Forge, NeoForge, Fabric17+declared10 Dec 2021
1.18Forge, NeoForge, Fabric17+declared30 Nov 2021
1.17.1Forge, NeoForge, Fabric16+declared6 Jul 2021
1.16.5Forge, NeoForge, Fabric8+declared14 Jan 2021
1.16.4Forge, NeoForge, Fabric8+declared29 Oct 2020
1.15.2Forge, NeoForge, Fabric8+declared17 Jan 2020
1.14.4Forge, NeoForge, Fabric8+declared19 Jul 2019
1.13.2Forge, NeoForge, Fabric8+declared22 Oct 2018

Download

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

Most recently published release

8.0.1+1.21.4release23 Jul 2025

caelus-neoforge-8.0.1+1.21.4.jar · 40 KB · for 1.21.5, 1.21.4 · NeoForge

Download this release
e4011ff6a460…
Older versions23
  • 8.0.0+1.21.421 Jun 20251.21.5, 1.21.440 KB1.5k downloadsf47944f473a6…Get
  • 7.0.1+1.21.15 Sept 20241.21.1, 1.2149 KB13.1k downloads3763f95304ad…Get
  • 7.0.0+1.2119 Jun 20241.2149 KB1.3k downloads22c323054ed3…Get
  • 6.0.0+1.20.67 May 20241.20.648 KB4.0k downloads1f7bda8c8d2b…Get
  • 5.1.0+1.20.422 Apr 20241.20.450 KB8.2k downloadsd8a2f9a4bd1e…Get
  • 3.2.0+1.20.122 Apr 20241.20.1, 1.2039 KB4.1M downloads906baad404c3…Choose file on publisher ↗
  • 5.0.1+1.20.45 Mar 20241.20.448 KB814 downloads36d74e6e36d6…Get
  • 5.0.0+1.20.419 Dec 20231.20.447 KB855 downloadsd5ea94da8f52…Get
  • 4.0.0+1.20.220 Oct 20231.20.237 KB2.6k downloadse71ed0c602ef…Get
  • 3.1.0+1.2012 Jun 20231.20.1, 1.2037 KB431.4k downloadsb665292cf808…Get
  • 1.19.4-3.0.0.1017 Mar 20231.19.4, 1.19.337 KB9.4k downloads8a90fe0cb0f4…Get
  • 1.19.3-3.0.0.917 Mar 20231.19.337 KB414 downloads61acc4f6cfd9…Get
  • 1.19.3-3.0.0.817 Mar 20231.19.337 KB375 downloads93dd8e483045…Get
  • 1.19.3-3.0.0.73 Feb 20231.19.337 KB466 downloadsbb8bd0689287…Get
  • 1.19.2-3.0.0.63 Feb 20231.19.2, 1.19.1, 1.1936 KB680.6k downloads11141abfb145…Get
  • 1.18.1-3.0.0.23 Feb 20231.18.2, 1.18.1, 1.1836 KB270.6k downloads1992be966193…Get
  • 0.0.18-1.17.13 Feb 20231.17.10.1 MB1.6k downloads3b7bcb9e8657…Get
  • 1.17.1-3.0.0.23 Feb 20231.17.137 KB1.6k downloads5c896b85750d…Get
  • 0.0.15-1.16.43 Feb 20231.16.5, 1.16.40.1 MB3.7k downloads4e9e91e8542c…Get
  • 1.16.5-2.1.3.23 Feb 20231.16.541 KB71.2k downloadsee8e06ca004f…Get
  • FORGE-1.15.2-2.0-beta43 Feb 20231.15.249 KB1.6k downloads6ed111030dfa…Get
  • FORGE-1.14.4-1.0.1.23 Feb 20231.14.446 KB1.4k downloads47ecfe647950…Get
  • 1.13.2-0.53 Feb 20231.13.241 KB1.4k downloadsfa753ab86d75…Get

Frequently asked

Does Caelus API work on Minecraft 1.21.5?

Yes. 1.21.5 is the newest Minecraft version Caelus API 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 Caelus API support?

Everything the author has declared, from 1.13.2 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 Caelus API on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does Caelus API support?

NeoForge, Forge, Fabric. 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 Caelus API?

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.

What licence is Caelus API under?

LGPL-3.0-or-later, 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 Caelus API?

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 Caelus API safely?

Start with the author's page on Modrinth, 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.

GeckoLibA 3D animation library for entities, blocks, items, armor, and more!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Jade 🔍Shows information about what you are looking at. (Hwyla/WAILA fork for Minecraft 1.16+)Collective🎓 Collective is a shared library with common code for all of Serilum's mods.

Used by

8 projects list Caelus API as a required dependency. The most installed ones are shown.

Elytra SlotAdds accessory support to the elytra so you can fly and wear chest armor at the same time. Formerly known as Curious Elytra and Elytra Trinket.Iron's Spells 'n SpellbooksA magic mod bringing back the classic RPG spellcasting fantasy. (irons spells and spellbooks)IcarusAdds a bunch of colourful and unique wings that can be worn in the Trinkets Cape slot.Hex CastingPowerful programmable stack-based spellcastingTruly Modular: Modular Item APIThis mod is the API designed for the Truly Modular modsHazentouveLibA lib for all of Hazen's mods.

Details from Modrinth, where the author last updated it on 23 Jul 2025. 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? .