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DuckyAntiCheat

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What DuckyAntiCheat is

DuckyAntiCheat, also called DuckyAC, is a free, modular anti-cheat plugin for Spigot and Paper Minecraft servers. It monitors movement, block placement, combat interactions, and packet timing. Listed checks include air jumping, flying, fast climbing, rapid block placement, reach, hitting through blocks, and timer manipulation. Server administrators can enable checks, set thresholds and violation levels, and choose punishments such as canceling events, setbacks or teleports, and configurable server commands. Repeated offenses are tracked through violation levels and can trigger commands after an alert threshold. Authorized staff can receive chat and console alerts, while optional Discord webhooks can send violation and punishment messages. The plugin exposes a Bukkit services API for other plugins to inspect data, report violations, apply punishments, and listen for events. Add-on checks are cleared after reloads. Installation requires placing its JAR in the plugins folder, starting the server, and editing the generated configuration.

Who it suits

It suits administrators running Spigot or Paper servers on Minecraft 1.20.6 who need configurable cheat checks and staff alerts. Developers can also use its Bukkit services API.

What it does well

  • Free plan
  • Checks movement, combat, placement, and timing
  • Configurable thresholds and punishments
  • Chat, console, and optional Discord alerts
  • Bukkit services API for extensions

What to know first

  • External checks clear after reloads
  • Broader coverage may require Vulcan and GrimAC
  • No replay analysis

Verdict

DuckyAntiCheat provides configurable detection and enforcement for Spigot and Paper servers without a license fee. Its runtime-only add-on checks and stated recommendation to pair it with Vulcan and GrimAC are important considerations.

Facts from DuckyAntiCheat's own pages

API limitation
Checks registered by external add-ons are runtime-only and are cleared when the plugin or server reloads. · github.com, 7 Oct 2026
Checks
Listed checks include air jumping, flying, fast climbing, fast block placement, reach, hitting through blocks, and timer manipulation. · github.com, 7 Oct 2026
Configuration
The plugin provides configurable check enablement, thresholds, punishments, and violation levels. · github.com, 7 Oct 2026
Coverage note
The maker recommends using DuckyAC alongside Vulcan and GrimAC for broader cheat detection coverage. · github.com, 7 Oct 2026
Detection
It detects suspicious behavior involving movement, block placement, combat interactions, and packet timing. · github.com, 7 Oct 2026
Detection coverage
The README recommends running DuckyAC alongside Vulcan and GrimAC for broader cheat detection coverage. · github.com, 7 Oct 2026
Developer API
External plugins can use the Bukkit services API to inspect checks and violation data, report violations, apply punishments, and listen for events. · github.com, 7 Oct 2026
Discord integration
Optional Discord webhook settings can send violation and punishment messages; the sample configuration has this integration disabled by default. · github.com, 7 Oct 2026
Extension limit
Checks registered by external add-ons are runtime-only and are cleared when the plugin or server reloads. · github.com, 7 Oct 2026
Installation
Installation consists of placing the plugin JAR in the server's plugins folder, starting the server, and configuring the generated config file. · github.com, 7 Oct 2026
License
The project is licensed under GPL-3.0, which the README says permits use, modification, and redistribution under that license. · github.com, 7 Oct 2026
Purpose
DuckyAC is a lightweight, modular, configurable anti-cheat plugin for Spigot and Paper Minecraft servers. · github.com, 7 Oct 2026
Staff alerts
Authorized staff can receive alerts in chat, and alerts can also be sent to the console. · github.com, 7 Oct 2026
Staff controls
Permission settings support full or per-check bypasses and alerts for authorized staff. · github.com, 7 Oct 2026
Support
The README directs users to Discord or GitHub issues for bugs and suggestions. · github.com, 7 Oct 2026
Violation tracking
A violation-level system tracks repeated offenses and can trigger configured commands after a check reaches its alert threshold. · github.com, 7 Oct 2026

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