I was helping a Sticky customer tweak their add to cart button when they asked if they should use a different looking button for Sticky.
Here's my response.
No.
Whatever color you use for your main button, you'd want to use for Sticky too.
This gives the appearance of consistency and helps remind the customer that "here's the add to cart button". That's why Sticky mimics the design as much as possible.
If your main add to cart button was blue but Sticky was red, that inconsistency would hurt conversions.
The customer's brain would have to process the new red button visually and try to decipher what that button is.
It only takes a millisecond but that's still time where your customer pauses with indecision and has to use their limited willpower and energy.
Energy that is better spent on clicking the actual button. Right?
Plus, there's something I've noticed while reviewing hundreds of Shopify stores:
It's really easy to spot which parts of the page are from apps versus a Shopify theme.
There's no consistency with the apps.
It's like 14 competing designs and pop-ups all stealing from your customer's brain (and focus and attention).
Remember, you want to make it easy for your customers to buy from you. Not difficult.
Easy.
Otherwise the customer will leave and you've lost them.
Anyways, the impact of app design on your conversion rate is an entirely different rabbit hole that I don't want to dig into today.
Eric Davis