Show item levels on:

• The character panel
• The inspect panel
• Loot windows
• The equipment-picker flyout
• Weapons, armor, and artifact relics in bags (built in, bagnon, baggins, inventorian)
• Tooltips (in classic)

I'm open to adding them in more places.

Also shows:

• An upgrade arrow on items in your bags which you can use whose item level is higher than whatever you currently have equipped.
• A soulbound indicator, so you can see whether something is soulbound, bind-on-equip, or warbound-until-equipped
• Missing enchants and gems

For a summary of settings: /simpleilvl

To toggle a place to display item levels: /simpleilvl [type]

...where type is bags, character, or inspect.

To disable the upgrade arrow: /simpleilvl upgrades

To change whether the text is colored by item quality or just left white: /simpleilvl color