SentinelAC review
A free, open-source Fabric 1.21.6 mod with configurable checks, alerts and enforcement.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
SentinelAC is a server-side anti-cheat and administration mod for Fabric servers running Minecraft 1.21.6. It is suited to solo operators and small server teams who want configurable detection and moderation tools in one self-hosted package. The MIT-licensed project is open source and available at no cost. A client installation can also show an observer HUD with local alerts, while server staff can use administration commands and a clickable chat menu.
Its sixteen checks span movement, combat, world interaction and packet behavior, including Speed, Fly, KillAura, Reach, Scaffold and BadPackets. Operators can tune detection thresholds and staff alerts, with per-player suspicion scoring to support moderation decisions. Punishment options include no action, kick, ban or a custom command, but they are configurable and off by default. Persistent player statistics and rotating JSONL event logs provide records for review; there is no replay analysis. This makes SentinelAC a fit for teams that want to adjust checks and examine logged events, rather than review recorded gameplay.
Deployment and compatibility define the main trade-off: SentinelAC is limited to Fabric and Minecraft 1.21.6, so servers using another platform or version should look elsewhere. It is self-hosted, and optional Discord webhook notifications are its stated external integration. The client HUD is an additional observer aid, not a substitute for server-side checks. Choose SentinelAC if your server matches its narrow platform target and you want open-source controls over detection and punishment; choose another option if you need broader version coverage, replay analysis or a different server platform.
SentinelAC pros and cons
- Where it wins
- Sixteen checks cover movement, combat, world interaction and packet behavior
- Staff alerts, suspicion scores and configurable kick, ban or command actions
- Persistent statistics, JSONL event logs and optional Discord notifications
- Where it doesn't
- Limited to Fabric servers running Minecraft 1.21.6
- Punishments are off by default and require configuration
- No replay analysis; enforcement depends on live checks and event logs
SentinelAC fact sheet, pricing and score →
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