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What's That Slot?Minecraft mod for 1.21.5

Utility that highlights which items can be placed in an item slot.

client onlynewest supported release 1.21.5Utility
Latest version
1.3.8+1.21.5
Minecraft
1.16.5 to 1.21.5
Java
Java 21+
Loaders
NeoForge, Forge, Fabric
Licence
LGPL-3.0-only
Downloads
279.7k
Updated
19 mo ago
Available on
Modrinth

Minecraft versions

Every version What's That Slot? 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
1.20.5Forge, NeoForge, Fabric21+declared23 Apr 2024
1.20.4Forge, NeoForge, Fabric17+declared7 Dec 2023
1.20.1Fabric, Forge, NeoForge17+declared12 Jun 2023
1.19.4NeoForge, Forge, Fabric17+declared14 Mar 2023
1.19.3Fabric, NeoForge, Forge17+declared7 Dec 2022
1.19.2Forge, NeoForge, Fabric17+declared5 Aug 2022
1.19Fabric, NeoForge, Forge17+declared7 Jun 2022
1.18.2NeoForge, Forge, Fabric17+declared28 Feb 2022
1.18.1Fabric, NeoForge, Forge17+declared10 Dec 2021
1.18Forge, NeoForge, Fabric17+declared30 Nov 2021
1.16.5NeoForge, Forge, Fabric8+declared14 Jan 2021

Download

From What's That Slot?’s own host. Nothing is re-hosted here.

Most recently published release

1.3.8+1.21.5release28 Mar 2025

whats-that-slot-neoforge-1.3.8+1.21.5.jar · 71 KB · for 1.21.5 · NeoForge

Download this release
96bf18772a9b…
Older versions15
  • 1.3.7+1.21.41 Mar 20251.21.471 KB4.0k downloadsb15909231c23…Get
  • 1.3.6+1.2124 Aug 20241.21.1, 1.2171 KB9.9k downloadse59de871f813…Get
  • 1.3.5+1.20.414 Apr 20241.20.470 KB889 downloadsbbf9f4fc4c15…Get
  • 1.3.41 Jul 20231.20.173 KB93.1k downloadscf7fe2aa9538…Get
  • v1.3.4+1.20.130 Jun 20231.20.10.1 MB103.2k downloads15ff22bb6516…Get
  • v1.3.3+1.19.421 Mar 20231.19.470 KB1.5k downloadsbee19d35d689…Get
  • v1.3.2+1.19.324 Dec 20221.19.370 KB339 downloads3d36d9a4a3a5…Get
  • 1.3.1+1.19.2-forge21 Aug 20221.19.273 KB2.0k downloads7fcfc648cdd6…Get
  • 1.3.1+1.19.2-fabric21 Aug 20221.19.20.1 MB33.8k downloads552ae6c0b46b…Get
  • 1.3.0+1.19-forge18 Jun 20221.1973 KB190 downloads6c3f4da16c03…Get
  • 1.3.0+1.19-fabric18 Jun 20221.190.1 MB357 downloads768fd55f90dc…Get
  • 1.2.2+1.16-forge22 May 20221.16.560 KB2.1k downloads1ce45ad0c3e3…Get
  • 1.2.2+1.16-fabric22 May 20221.16.50.1 MB360 downloads808a4217fe67…Get
  • 1.2.3+1.18-forge22 May 20221.18.2, 1.18.1, 1.1873 KB4.1k downloads084ccccd5dea…Get
  • 1.2.3+1.18-fabric22 May 20221.18.2, 1.18.1, 1.180.1 MB3.8k downloads9fbc57828dd7…Get

Frequently asked

Does What's That Slot? work on Minecraft 1.21.5?

Yes. 1.21.5 is the newest Minecraft version What's That Slot? 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 What's That Slot? support?

Everything the author has declared, from 1.16.5 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 What's That Slot? on the client or the server?

The client only. There is nothing to install on the server side. That is the author's declared design, not a guarantee for every server: one running anti-cheat or missing a counterpart mod can still object.

Which platform or loader does What's That Slot? 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 What's That Slot??

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 What's That Slot? under?

LGPL-3.0-only, 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 What's That Slot??

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 What's That Slot? 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.

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Details from Modrinth, where the author last updated it on 28 Mar 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? .