Menu apps put products in front of shoppers in one of two ways. They copy your product data once, or they read it live on every page view. That single design choice decides whether your menu can lie.
Most menu builders store a copy of each product you pick: its name, its image, its price. The copy is taken the day you build the menu. From that day on, your store moves and the copy does not. Lower a price, launch a sale or sell out a size and the menu keeps showing the world as it was.
This is not a bug in those apps. It is the design. A copied number has no way to update itself.
Uno renders your menu on Shopify's servers, inside your storefront, at the moment each page loads. Product cards read the current price, the current stock and the current promotion straight from your store. There is no copy to go stale, so there is nothing to resync and nothing to remember.
Every line in the Uno column describes shipped behavior you can test on a development store before installing on your live theme. The snapshot column describes what copied data can and cannot do by construction, whichever app does the copying.
Free plan available. Menus render server-side, with no flash on page load.