Paying for a Health App Boosts Engagement, but Not for Long

Mobile health apps have become a popular tool for eating better, moving more, and losing weight. Almost all of them run on the same business model: the core programs are free, and unlocking the full experience with richer features requires a paid subscription. It’s a familiar “freemium” bargain, and for app companies it’s the primary way of making money.

But does paying for the upgrade actually change behavior? When someone invests in the app, do they stick to their goals more faithfully, track more diligently, and ultimately lose more weight? Or are they simply buying features that, before long, they stop using? For users, paying may also seem like a commitment to take their health goals more seriously.

Recent work by Yale SOM’s Kosuke Uetake, forthcoming in Marketing Science and written with Yikun Jiang of Purdue and Nathan Yang of the University of Illinois, tackles this question. In short, they find that upgrading produces “an initial surge in engagement,” but this fades over time, with no sustained improvement in engagement or weight-loss outcomes.

The researchers worked with detailed data from a leading U.S. fitness-tracking app. They focused on nearly 12,000 users who registered in late 2015 and were serious enough about their goals to stay active for at least 30 days and log multiple weigh-ins. About 7% of users upgraded to the premium version ($39.99/year) within their first seven weeks. Tracking daily behavior over the first 15 weeks after registration, the team could compare the behavior of users who paid against those who stayed on the free tier.

However, a simple comparison of premium and free users would exaggerate the effect of the subscription by attributing pre-existing motivation to the paid features.

To reduce this concern, the researchers accounted for users’ demographics, initial weight-loss goals, early app activity, and the timing of their upgrades. They also conducted additional analyses comparing adopters with non-adopters who had similar recent engagement patterns. The results remained broadly similar.

The paper found premium adoption had an immediate effect on how people used the app.

In the first week after upgrading, premium users were 11.4 percentage points more likely to track their exercise than comparable non-upgraders. By week seven that edge had slipped to 7.9 points, and soon after it disappeared entirely. Food tracking followed the same arc, as did sticking to a daily calorie budget and logging exercise calories. Every metric showed a sharp jump right after purchase, then a steady drift back toward users’ starting points.

The weight-loss results offered a contrast. There was no immediate effect on weight loss, and only a modest one later; those who upgraded lost about two-thirds of a pound more by week three, growing to roughly 1.3 pounds by week ten, before the divergence in this metric ultimately lost statistical significance. In other words, the flurry of extra tracking didn’t reliably convert into people keeping weight off.

The authors explore a few potential mechanisms driving this outcome and arrive at two contenders. First, a sunk-cost effect: People may work harder to justify the money they spent. If this were the case, then everyone should show a similar bump in activity when starting the premium tier.

Instead, users who had barely used the free app before upgrading showed a much bigger jump in motivation than those who’d already used it heavily. For Uetake and his colleagues, this pattern points to what they call “hedonic decline:” the premium features feel exciting and new at first, but the thrill wears off, and it wears off fastest for those most familiar with the app.

For anyone designing or marketing a digital health product, three practical lessons stand out.

First, a one-time paid upgrade can buy a short-term spike in engagement, but don’t expect it to sustain long-term habits. Without ongoing reinforcement, the boost in interest fades within weeks.

Second, engagement is not a proxy for health. More logging in the short run did not reliably produce more weight loss; active users were not necessarily successful ones.

Finally, novelty is a lever worth pulling. Because the engagement lift is driven by newness, long free trials may actually backfire, exhausting the appeal of premium features before users ever pay for them. And rolling out fresh features over time, rather than front-loading everything, may be a more durable way to keep people engaged.

The lesson, ultimately, is not that premium health apps have no value. An upgrade can create a useful moment of renewed attention. But the purchase is more likely to be the beginning of an effective intervention than its culmination.

Turning a temporary burst of enthusiasm into lasting behavioral change may require repeated innovation, personalized reinforcement, and continued reasons for users to return.

Discover more insights from Yale SOM’s renowned faculty here or reach out at ycci@som.yale.edu for other ways to collaborate.