When to reach for it. Use it to add a tip and divide a bill evenly across a group, including rounding each share to a sensible amount.
When something else is better. It assumes an even split; itemised “you had the steak” math is a different exercise.
The pitfall to watch. Tipping on the tax-inclusive total versus the pre-tax subtotal changes the figure — agree which the table is using.
Everything runs on your device. The values you enter are processed locally in this browser tab — EpitomeTool does not send your input to a server, store it, or log it. That means you can use the tool offline once the page has loaded, and refreshing the tab wipes the slate.