Entity Observer
by Kootryne
Entity Observer adds two redstone blocks that send a signal when an entity stands in front of them, and the Player Observer variant responds only to players.
What it does
Entity Observer adds two blocks. The standard block watches the position in front of it and emits redstone power when a mob, animal or player is there. The Player Observer works the same way but ignores every other kind of entity, so it fits hidden entrances and contraptions that should react only to people.
The output strength depends on distance: an entity six blocks away produces a weaker signal than one standing directly in front, so builders can read how far away a target is from the power level alone. Both blocks can be named with an anvil, which keeps large redstone builds simple to follow. Installation requires Fabric on the client and server, with Fabric API needed as the loader's base layer; the mod is released under the MIT License, though it is not open source. Files exist only for Minecraft 26.1.2, with version 1.0.1 for 26.1.2 published on 2026-04-28, after the first release on 2026-04-27.
Key features
Entity detection
The Entity Observer sends a redstone signal when any entity stands in front of it.
Player-only variant
The Player Observer reacts to players alone and disregards mobs and other entities.
Distance-based output
Signal strength drops as the target moves further away, so the power level indicates distance.
Nameable blocks
Both observers can be renamed with an anvil, which helps label large contraptions.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Hidden entrances
A Player Observer can open a hidden door only when a player approaches, leaving mobs untouched.
Redstone contraptions
Builders can wire the signal into other contraptions that need an entity trigger.
Who it’s for: The mod suits redstone builders and adventure map makers who want observers that react to entities or only to players. It is also useful for server owners running automated builds that should not respond to every passing mob.
How it compares
Smart Observer is a Fabric mod for 1.21.1 – 1.21.8 that runs on the client and server and is open source under the MIT License. Observer Plus is a client-side Fabric mod for 1.21.11 with All rights reserved and no open source. Entity Observer targets only 26.1.2 and is not open source, so it differs from both in its version range and licensing.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Entity Observer | Fabric | 26.1.2 | Client and server | 2026-04-28 |
| Smart Observer | Fabric | 1.21.1 – 1.21.8 | Client and server | 2025-08-27 |
| Observer Plus | Fabric | 1.21.11 | Client-side only | 2026-03-12 |
Questions
Does Entity Observer need Fabric API?
Does the server need Entity Observer?
Which version does Entity Observer target?
In the catalog
Entity Observer is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 15,189 mods support Minecraft 26.1.2.
More from Kootryne
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What the author says
The Entity Observer mod is a mod that adds two blocks. The Entity Observer and the Player Observer. The functionality of these two blocks is very simple. If the target identity stands in front of the observer block, the observer block will output a signal, and the strength is dependant of how far away the identity…
Official listing
- Modrinth page
- modrinth.com/mod/entity-observer
- Owner
- Kootryne
- Published
- 2026-04-27
- Updated on Modrinth
- 2026-04-28
- Facts verified
- 2026-10-15