Inventory Vertical Swap

The mod is a client-side utility for NeoForge on 1.21.1. Holding Left Ctrl and long-pressing a number key opens a vertical column of items above the matching hotbar slot, and the mouse wheel scrolls through it. When the key is released, the chosen item changes places with the item in the main hand. Complicated sorting rules are not part of the design: items are simply arranged in a vertical column, shown as an alternative menu next to the inventory.

The default hotkey is hold-based and needs no other input. Players who prefer a different style can switch to a second mode that uses a command instead, and server owners can adjust the hold duration for the vertical hotbar in the config file. Item names can be hidden by toggling off the first mode's display, and the feature that opens the vertical hotbar on long-pressed number keys can be disabled with the same command.

It is installed on the player's side alone, so servers need nothing. The code is released under the MIT License and is not open source. Files exist only for NeoForge and only for 1.21.1, first published and last updated on 2026-05-19 with the 1.0.0 release.