Known incompatible client mods

This page details a list of known client mods that are incompatible (i.e. cause false positives, or violate vanilla mechanics in general) with Grim.

Caution

This list is non-exhaustive. If you find a mod that causes issues with Grim that is not listed here, open an issue or tell us on Discord.

Incompatible client mods

Mod	Reason
Accurate Block Placement Reborn or Reforged Accurate Block Placement Reborn	Violates vanilla block placement rules.
Always Sprint Should be fixed on versions that support Minecraft 1.21.6+	https://github.com/Joscha-Goetz/Always-Sprint/issues/2
Anchor Optimizer or Hero's Anchor Optimizer	Removes anchors client-side, flagging Simulation.
Bedrockify	Bedrock.
Click Crystals	Violates vanilla crystal rules by allowing you to place and break crystals in the same tick.
Consumable Optimizer	Ignores the server's item use state, flagging NoSlow.
CookeyMod Prior to 1.7.14	Violates vanilla movement rules.
Cut Through	Allows hitting through blocks/walls.
Dokko's Hotbar Optimizer	Flags Post.
Faster Ladder Climbing or Ladder Warp	Violates vanilla movement rules.
Fast Xp	Flags Post.
FPS Plus Legacy Fabric	Violates vanilla mathematical rules.
Free Move	Violates vanilla inventory/movement rules.
"Inventory Move" mods	Violates vanilla movement rules. You cannot move whilst inside an inventory.
Inventory Profiles Next	Violates vanilla inventory/movement rules. Flags MultiActionsC.
Jump Over Fences	Violates vanilla movement rules.
MidnightControls	Violates vanilla movement rules, even with analogue input enabled. As an alternative, use Controlify with analogue input.
Mouse Tweaks	Violates vanilla inventory rules.
No Delay Optimizer	Likely the same as "Consumable Optimizer": Ignores the server's item use state, flagging NoSlow.
No Input Lag Tick Rate	Violates vanilla movement rules.
Pro Placer	Violates vanilla block placement rules.
Punchy!	Violates vanilla packet order when attacking or mining.
Quick Exp	Flags Post.
Shoulder Surfing Reloaded	Flags TickTimer.
Smart Block Placement	Violates vanilla block placement rules.
Syncac	Flags Post.
ViaFabricPlus	In many cases, it does not properly emulate how a client version actually functions. Can cause various flags, including Simulation and BadPackets.
Vivecraft	Completely breaks vanilla compatibility in several areas.
Wall-Jump TXF	Violates vanilla movement rules.