SlotGlow
by Apollo_1201
SlotGlow replaces the default selected-slot box on the Minecraft hotbar with a customizable glowing highlight, configured through Mod Menu.
What it does
Instead of the plain gray box that marks the selected hotbar slot, SlotGlow draws a highlight whose color, glow, outline and animation the player chooses. Settings cover color presets such as purple, blue, green, red, gold, pink and white, RGB sliders for custom shades, and a rainbow mode. Pulse speed, glow strength, outline thickness and opacity can be adjusted as well.
The mod is client-side only, so the server does not need it and players can use it on any server or in single-player. It changes only how the hotbar looks and adds no blocks, items, mobs or gameplay changes. Files are published for Fabric, targeting 1.21.11 only, and the mod is released under the MIT License, though it is not open source. Its settings are opened from Mod Menu, which is installed separately.
Key features
Custom hotbar highlight
The selected-slot box is replaced with a glowing outline that the player styles from the settings screen.
Color presets and RGB sliders
Presets such as purple, blue, green, red, gold, pink and white sit alongside RGB sliders for any custom color.
Rainbow mode
A rainbow option cycles the highlight through the spectrum instead of holding a single color.
Pulse and glow controls
A pulse animation can be turned on, with adjustable speed, glow strength, outline thickness and opacity.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
A cleaner hotbar
Players who want a less default-looking HUD can swap the gray box for a color that matches their build or texture pack.
Streaming and screenshots
A bright or rainbow highlight makes the selected slot visible in recordings without changing any gameplay.
Who it’s for: Players who want a personal hotbar style on the client. Server owners do not need to install it for players to use it.
How it compares
Outline Mod, by Action & Stuff, is also client-side only, but it is for Fabric 1.21.1 – 1.21.5 and is not open source. SelfGlowing is a client-side Fabric mod for 1.21.11, with All rights reserved and not open source. Color Blocks is client and server, open source under the MIT License, and built for Fabric 1.21.1, so it differs in both environment and version range.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| SlotGlow | Fabric | 1.21.11 | Client-side only | 2026-06-20 |
| Outline Mod (Action & Stuff) | Fabric | 1.21.1 – 1.21.5 | Client-side only | 2025-06-09 |
| SelfGlowing | Fabric | 1.21.11 | Client-side only | 2026-08-31 |
| Color Blocks | Fabric | 1.21.1 | Client and server | 2024-09-21 |
Questions
Does SlotGlow need to be installed on the server?
Which Minecraft version does SlotGlow support?
How are the highlight settings changed?
In the catalog
SlotGlow is one of 12,078 Decoration mods on ModsFinder, and one of 6,982 Decoration mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
SlotGlow is a client-side Fabric mod that replaces Minecraft’s default hotbar selector with a clean, customizable glowing highlight. Instead of the normal gray selected-slot box, SlotGlow lets you create your own custom hotbar style with colors, glow effects, rainbow mode, opacity settings, outlines, animations, and…
Official listing
- Modrinth page
- modrinth.com/mod/slotglow
- Owner
- Apollo_1201
- Published
- 2026-06-20
- Updated on Modrinth
- 2026-06-20
- Facts verified
- 2026-10-15