Is there an app that will only show an upsell if a specific product is added to the cart?

Being specific and targeting upsell when the right opportunity arises may be a great initiative to boost your sales. "JustUno" is a good platform with 100+ tools - You can leverage it to create a customized upsell funnel after added to the cart. "AfterSell Post Purchase Upsell" is another available option.

Many up-selling and cross-selling apps give you the ability to choose when certain products appear, including when certain items are added to your cart.

Cross Sell PRO, Discounted Upsell & Cross Sell, and Booster: Discounted Upsells are all options to consider that range in pricing from free to $44.99 a month.

With great upselling tactics, your business can boom and you can generate impressive sales. Many upselling apps can give you the option to select the products when they are added to the cart. Examples of such apps are- Upsell Recommendations, Bold Upsell, Personalizer by LimeSpot, and Smart Bundle Upsell. These apps can be availed in the free plan as well as the premium plan.

An app called Bold that does just that. You can set it to only show the upsell if another specific product is added to cart - it's really great for optimizing targeted upsells. Not many businesses use this tactic and you could definitely get ahead of the game if you start implementing it first.