Mob Spawn Indicator
by dvnxvll
Mob Spawn Indicator marks the floors where hostile mobs can spawn, drawing color-coded overlays on the block surfaces around the player.
What it does
The mod highlights the block surfaces in the area around the player where hostile mobs can appear. Each valid spawn floor is drawn with a colored overlay, so a player can see at a glance which spots are dangerous, which need watching and which are safe. Spawn checks follow the vanilla spawn rules, so the overlays match what the game would actually do.
Because it only changes how the client draws the world, Mob Spawn Indicator runs on vanilla servers, SMPs and modded servers alike, and a server does not need the mod installed. Render distance, opacity and colors can be adjusted in a settings screen reachable from the Options menu or through commands. The mod is published for NeoForge only, for 1.21.1. It is released under the GNU Lesser General Public License v3.0 only, and the code is open source.
Key features
Spawn floor overlays
Block surfaces where hostile mobs can spawn are outlined with colored overlays in the player's vicinity.
Danger color scale
Red marks the most dangerous floors, yellow a moderate risk and green a safe spot, so the levels can be told apart.
Adjustable display
Render distance, overlay opacity and colors can all be changed to suit the player's view and preferences.
Settings screen access
The settings are reachable from the Options screen, and commands can also open them.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who want to see where hostile mobs can spawn while building, mining or exploring, on singleplayer worlds or on multiplayer servers where the server owner has not installed the mod.
How it compares
Stick to highlight is a NeoForge mod for 1.21.4 with the client and server environment, under the MIT License, and it is not open source. Light Level Overlay is client-side only, open source under the MIT License, and covers Fabric and NeoForge for 1.21.1 – 1.21.10, so it shows light levels rather than spawn floors. Floating Damage Indicators is open source and runs on both sides for Fabric and NeoForge, 1.21.1 – 26.3.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Mob Spawn Indicator | NeoForge | 1.21.1 | Client-side only | 2026-06-27 |
| Stick to highlight | NeoForge | 1.21.4 | Client and server | 2025-07-01 |
| Light Level Overlay | Fabric and NeoForge | 1.21.1 – 1.21.10 | Client-side only | 2026-01-14 |
| Floating Damage Indicators | Fabric and NeoForge | 1.21.1 – 26.3 | Client and server | 2026-10-08 |
Questions
Does Mob Spawn Indicator need to be installed on the server?
Which game version and loader does Mob Spawn Indicator support?
Does the overlay follow the real spawn rules?
In the catalog
Mob Spawn Indicator is one of 29,952 Game mechanics mods on ModsFinder, and one of 12,140 Game mechanics mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
Mob Spawn Indicator highlights valid mob spawn floors in your vicinity with color-coded overlays. It uses vanilla spawn rules, so it works on any server without needing to be installed server-side.
Official listing
- Modrinth page
- modrinth.com/mod/msi
- Owner
- dvnxvll
- Published
- 2026-06-27
- Updated on Modrinth
- 2026-06-27
- Facts verified
- 2026-10-15