Player-detector-Beta
by fykz_._.
Player-detector-Beta is a Fabric social mod that shows pop-up notifications and chat messages when a player joins or leaves the game.
What it does
Player-detector-Beta reports player joins, leaves and advancements through vanilla-style toast pop-ups in the top-right corner of the screen and through chat messages. Notification text can be changed with placeholders such as the player name and server name. Notifications can be sent to friends, operators or everyone, and a per-player toggle lets each person choose which kinds they see.
The mod also includes cooldown filtering, which holds back repeated alerts during server reloads and rapid reconnects so chat is not flooded. Default settings show a toast and a chat line for each join and leave. Behaviour can be adjusted by editing the config file, or in game through ModMenu when that mod is installed. Player-Detector must be installed alongside it, and the mod is for Fabric 1.21.11 only.
Key features
Join and leave toasts
Vanilla-style toast pop-ups appear in the top-right corner when a player joins or leaves the server.
Advancement notices
Advancements are announced with the same toast style used for recipe and achievement messages.
Custom message text
Join and leave messages accept placeholders, so the player name and server name can appear in the text.
Per-player audience settings
Each player can choose whether notifications go to friends, operators or everyone, and can switch each type on or off.
Cooldown filtering
A cooldown stops repeated alerts caused by server reloads or rapid reconnects from spamming chat.
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: Server owners who want join and leave notices on a dedicated server, and players who want the same pop-ups in a single-player world or on a LAN game.
How it compares
Classic Detector is a Fabric client-side mod for 1.20 – 1.21.4 under the MIT License, and it is not open source. Player-detector-Beta covers 1.21.11 only, and its join and leave messages are configurable with placeholders. Better Join Messages is server-side only for 1.21.11 – 26.3 under the MIT License and not open source, so players need nothing installed. Custom Join&Leave Messages is server-side only for 1.21.11 and is released under All rights reserved, which means it is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Player-detector-Beta | Fabric | 1.21.11 | Client-side only | 2026-06-16 |
| Classic Detector | Fabric | 1.20 – 1.21.4 | Client-side only | 2025-04-17 |
| Better Join Messages | Fabric | 1.21.11 – 26.3 | Server-side only | 2026-10-04 |
| Custom Join&Leave Messages | Fabric | 1.21.11 | Server-side only | 2026-04-17 |
Questions
Does Player-detector-Beta need Player-Detector installed?
Is it needed on a dedicated server?
Can the notifications be changed?
In the catalog
Player-detector-Beta is one of 5,392 Social mods on ModsFinder, and one of 4,084 Social mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
Install Fabric Loader (most third‑party launchers like Prism, MultiMC, or Modrinth can do this automatically). Place both.jar files into your mods folder.
Official listing
- Modrinth page
- modrinth.com/mod/player-detector-beta
- Owner
- fykz_._.
- Published
- 2026-06-08
- Updated on Modrinth
- 2026-06-16
- Facts verified
- 2026-10-15