The UX Psychology Behind Apps People Can’t Stop Using

The Impact of Decision Fatigue on User Engagement 00:42

"Stop giving users blank forms. The more choices you stack on someone at once, the more likely they are to make no choice at all and just leave."

• Providing users with too many empty fields or decisions can lead to decision fatigue, making them more likely to abandon the task. A study has shown that fewer choices can significantly improve conversion rates; when a grocery store reduced the number of jam options from 24 to 6, the purchase rate surged from 3% to 30%.

• By implementing smart defaults, where the most common options are pre-selected, you make the task easier for users. Most users do not change the default settings because it fosters trust—the smart defaults act as recommendations, simplifying the user’s decision-making process.

Enhancing User Experience with Progress Indicators 02:11

"The closer people feel to finishing something, the faster they move toward it."

• Researchers have demonstrated that users are more likely to complete a goal when they perceive they are closer to finishing. For example, when given a loyalty card with pre-filled stamps, participants nearly doubled their completion rates compared to those starting from zero.

• Displaying a progress indicator that shows completion beyond zero can create a sense of momentum. LinkedIn uses this technique effectively by showing a user's profile strength meter, which keeps users engaged as they feel they have already invested effort. Never start a user at zero; show an artificial head start to motivate completion.

The Power of Reciprocity in User Engagement 03:53

"When someone gives you something first, you feel a pull to return the favor."

• Users are less likely to engage with apps that demand something before providing value. Instead of asking for email sign-ups upfront, offering a sample or a preliminary report can incentivize users to return. This taps into the principle of reciprocity—when users receive something they value, they are more inclined to reciprocate.

• Free samples or initial insights provided without strings attached create an unconscious debt in users, motivating them to come back. Companies like Costco and Spotify utilize this strategy effectively, offering initial experiences or products for free to encourage user retention.

Building Investment Through User Input 06:13

"When people build something themselves, they value it significantly more than an identical item someone else made."

• Engaging users in the initial stages of the sign-up process by allowing them to make selections—like choosing preferences or personalizing interfaces—can increase their sense of ownership. This process makes abandoning the sign-up feel like losing something they’ve started to create.

• Companies like Duolingo exemplify this strategy by allowing users to select their language and set goals before creating an account, fostering a sense of investment and making it less likely for users to walk away from the process.

Framing User Decisions 08:36

"Whenever you're designing a screen that asks users to act, flip the framing."

• It is crucial for product designers to understand the psychological impact of how information is presented to users. When prompting user action, it’s more effective to highlight potential losses rather than gains.

• For example, in a screen showing a premium upgrade option for a storage app, emphasizing what users risk losing—like their actual files—creates a sense of urgency and fear of loss that motivates action.

• The concept of status quo bias plays a significant role here; users are more inclined to protect what they have than to seek new gains. Thus, framing features in terms of loss significantly increases the likelihood of user engagement.

Contextual Impact on Perceived Value 09:37

"Don't show a cost in isolation; always control what the user sees first."

• Perceived value of a product often depends on the context in which it is presented. When a protection plan is displayed alongside a high-priced item like a $1900 laptop, the $50 protection plan suddenly seems negligible, being perceived as just 2.6%.

• This phenomenon highlights the contrast effect, where users evaluate information based on relative comparisons rather than absolute values. This principle illustrates why restaurants and real estate agents often employ high-priced items or properties to make other offerings appear more appealing.

• Designers must strategically present costs, as the first number users encounter will serve as an anchor for comparison to subsequent information, influencing their decision-making process significantly.