It’s Monday, I’m Nithya Sudhir. I collect words, chase patterns, and write about whatever makes me curious.
Most shopping websites have a tiny icon next to every product.
♡
Tap it, and the item is saved to a wishlist.
For many brands, this interaction is one of the clearest signals of purchase intent.
Online sites with a wishlist experience 21% higher conversion rates.
However, the question we’re asking today isn’t why the wishlist exists.
It’s: why is it a heart?
Today’s piece kicks off a six-part series called ‘Interface Instincts’, where I cover tiny symbols shaping online shopping.
It’s Monday. Let’s get right into it.
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From Ancient Plants to Product Pages
The heart symbol has traveled a long way before landing on e-commerce product pages.
Historians believe the shape evolved from stylized plant forms and decorative motifs used in ancient art. One popular theory connects it to silphium, a plant from the ancient Mediterranean that became associated with romance and affection. People also think it may have been inspired by Aristotle’s offbeat description of the organ.
By the Middle Ages, the symbol appeared in French manuscripts where lovers exchanged hearts as tokens of devotion. Later, it spread through playing cards and pop culture.
In the digital age, the heart took another form: <3, an ASCII shorthand for affection online.
Long before e-commerce adopted it, the heart already meant “I like this.”
Why E-commerce Turned Wishlists Into Hearts
Early e-commerce wishlists were purely functional.
When Amazon introduced Wish Lists in the late 1990s, they worked like simple databases.
Customers clicked “Add to Wish List” to save products for gift registries, holiday shopping, or future purchases.
The interface looked closer to a spreadsheet than a shopping experience.
A small, tiny detail, that shoppers browse more products than they are ready to buy, made wishlists a holding area for intent.
Then, as screens shrank in the 2010s, text buttons became icons.
Designers tested bookmarks, stars, and plus signs. But the heart consistently won.
Why?
One, because 95% of purchasing decisions are subconscious.
Two, the heart icon is more emotive by its very nature.
When shoppers add an item to a wishlist, they are expressing desire.
And the heart icon communicates exactly that.
Three, it's everyone’s favorite!
Source: The Most Used Emojis in 2025, Buffer
The Brain on Hearts
The heart works in e-commerce because it taps directly into how people process symbols.
We recognize emotional symbols faster than neutral ones. The heart carries strong emotional associations across cultures, so the brain processes it instantly.
That matters in e-commerce, where decisions often happen in milliseconds.
Dopamine and Micro-Rewards
Most wishlist icons toggle from: ♡ → ♥
Research on reward learning shows that instant feedback strengthens behavior and encourages repetition. The moment a heart fills in, the brain registers a tiny reward signal. This type of micro-interaction is one reason users repeatedly save products, building larger wishlists over time.
Fun fact: wishlists have limits! (No, I did not find out the hard way)
Cognitive Fluency
The heart is also one of the most recognizable icons in modern interfaces.
Users see it constantly on platforms like Instagram and Twitter. Because the symbol is familiar, the brain processes the action quickly with minimal effort.
And according to science, when an interaction feels effortless, people are more likely to perform it.
That makes the heart not just a symbol of preference, but a highly efficient interface shortcut.
In e-commerce, efficiency often translates directly into engagement.
How One Icon Increased Engagement by 30%
In the summer of 2012, Airbnb redesigned its site around a new feature called Wish Lists.
The goal was simple: help travelers collect places they liked while browsing.
Originally, the interface used a generic star icon to save listings.
Then the team tried something small but radical: they replaced the star with a heart.
The result surprised them.
Within four months, 45% of Airbnb users were engaging with Wish Lists, and more than one million lists had been created. After switching to the heart icon, engagement increased by 30%.
Co-founder Joe Gebbia later explained that the heart revealed something deeper about how people use the product.
To users, saving a place was emotional. They were imagining future experiences — trips, memories, possibilities.
The experiment showed that a tiny interface symbol could change how people interacted with the entire platform.
How to Think More Intentionally About Icons
Small interface symbols shape how shoppers interpret actions on your site. When the icon matches what the brain already expects, people click without thinking.
Recent platform updates, including new testing tools across the Shopify ecosystem, now allow brands to experiment with UI elements like icons, colors, and micro-interactions.
Here are five ways to think about them more deliberately:
1. Meaning before beauty
A good icon should communicate its purpose instantly. If users need to interpret it, the design is already weaker.
2. Design for instinct
The best icons feel obvious. People should know what to do without thinking.
3. Match emotion to action
A heart signals desire. A bookmark signals saving. The symbol should match the feeling behind the behavior.
4. Treat icons like brand language
Small symbols shape how your product feels to use. They reinforce tone and trust.
5. Ask what habit you’re creating
Every icon trains behavior. The real question isn’t “does this look good?” It should be “what action does this encourage?”
That’s all for today.
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Until next week，
Nithya
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