Top 5 Challenges When Working with Wearables in Healthcare

The global wearables market is exploding. From smartwatches and sleep rings to glucose monitors and fitness trackers, millions of people generate a constant stream of health data every second. For healthtech startups and wellness companies, this looks like a gold mine of insights.

In reality, working with wearable data is much harder than it seems. Every device speaks its own language, every ecosystem has its own limits, and the more data you collect, the harder it becomes to make sense of it. The dream of “AI-powered health coaching” often turns into endless integration work.

In this article, we will look at the five biggest challenges developers and product teams face when building apps around wearable data and what can be done about them.

1. Fragmented Ecosystems and SDK Chaos

If you ever tried to integrate Apple Health, Garmin, Fitbit, Oura, Whoop, and Strava in one product, you know the pain.

Each brand has its own SDK or API, its own data formats, algorithms and its own permission model. Steps on Garmin are not the same as steps on Fitbit. Heart rate data from Apple Watch arrives differently from Oura. In case of data overlap - which one should have priority? And every update can break your connection.

You spend more time managing integrations than building features. Some apps even give up and support only one or two devices, losing users who rely on other brands.

Interoperability is one of the biggest obstacles in digital health. Even scientific studies confirm that fragmentation between wearable platforms slows down innovation. The more devices appear on the market, the more complex it becomes to support them.

Takeaway: A unified data layer or standardized API can reduce months of development into days. Instead of maintaining six different SDKs, your team works with one consistent data model.

2. Data Inconsistency and Quality Issues

Let’s say you successfully collect data from multiple devices. The next problem appears: none of them measure things in the same way.

Heart rate variability (HRV) is calculated differently by every manufacturer. Sleep stages vary depending on the algorithm. Calorie data is not directly comparable between Garmin and Oura. Even something as simple as “steps” can mean different things depending on the sensor.

This inconsistency makes analysis unreliable. You cannot build serious AI models or clinical insights on top of unstructured, incompatible data. When the foundation is weak, everything built on top of it suffers.

Data quality also depends on user behavior. People forget to wear their devices, skip syncing, or switch brands. The result is messy, incomplete records that are hard to normalize.

Takeaway: To make data meaningful, it must be cleaned, standardized, and unified first. This means building ETL (Extract, Transform, Load) pipelines that automatically harmonize metrics across brands. Without this step, any advanced analytics or personalization will fail.

3. Apple Health’s Mobile-Only Restriction

Apple Health is the single most popular health data source on the planet. But it comes with one of the most limiting rules in the ecosystem.

Apple does not provide a backend API for HealthKit. All data stays on the user’s iPhone and is encrypted. This means that if you want to access Apple Health data, you must build a native iOS app. Web-based products cannot directly read that data from a server.

For developers, this rule has two major effects:

1. You cannot access data unless the user installs your mobile app and grants permission.
2. You must design your system around local data sync and secure storage.

Many startups discover this too late. They begin with a web app, then realize that to use Apple Health data, they must build an iOS companion app from scratch.

While this restriction protects user privacy, it also creates a barrier for innovation. Building native mobile infrastructure is expensive and time-consuming.

Takeaway: Plan for mobile-first architecture from day one. If your product depends on wearable data, you will need an app that can read and sync HealthKit locally. This is also an opportunity: companies that handle Apple Health integration correctly can create a strong competitive edge.

4. Privacy, Security, and Compliance Pressure

Wearable data is personal health information. Heart rate, sleep cycles, stress levels, glucose trends — these are extremely sensitive metrics that fall under strict regulations such as HIPAA, GDPR, and regional health data laws.

Each integration point increases your compliance risk. Even if you do not store raw data, transferring it between systems or running it through AI models requires robust security measures. Encryption, consent management, and user data ownership must be baked into the architecture.

The challenge is not only technical. It is also about trust. Users want personalized experiences but do not want to feel watched. They want to benefit from AI but still control their data.

Companies that treat privacy as a product feature, not an afterthought, win in the long run. Apple’s on-device processing model is a great example of privacy by design, but most apps cannot replicate that without help.

Takeaway: Build privacy-first. Use architectures where data stays under user control and make transparency part of your value proposition. A unified and secure infrastructure for wearable data can help you stay compliant while still delivering intelligent features.

5. From Data to Insight: The AI Gap

Even after you have clean, standardized data, one problem remains: making it useful.

Most health and fitness apps end up as dashboards full of numbers. Users see their steps, sleep scores, and heart rates — but they don’t know what to do with them. Data without context does not improve health.

Turning raw data into actionable insight requires intelligence. It means detecting patterns, understanding behavior, and personalizing recommendations. This is where AI comes in.

However, building health-focused AI models is not easy. They need access to unified, high-quality data and must be explainable to earn user trust. Without a clean and consistent data layer, even the smartest algorithms will fail.

Takeaway: The next generation of health products will not be defined by how much data they collect but by how well they interpret it. The winners will be those who bridge the gap between data and insight with adaptive, AI-ready infrastructure.

The Bigger Picture

All five challenges — fragmented ecosystems, inconsistent data, Apple Health limits, privacy risk, and the AI gap — share one root cause: a lack of interoperability and standardization across wearable platforms.

This is exactly why the idea of open infrastructure for wearables is gaining attention. Developers should not have to reinvent the wheel every time they want to connect Garmin or Oura. They need a common language that unifies data and makes it AI-ready.

Open Wearables is one example of how this can be done. It connects Apple Health, Garmin, Fitbit, Oura, Whoop, and Strava through one API. It standardizes the data, handles OAuth, and prepares it for analysis or AI workflows. It can save months of integration work and turn complex health data into something usable.

Conclusion: Building the Future of Personal Health

The future of digital health will depend on how well we can connect and understand data. Wearables give us an incredible opportunity to see how people live, move, and recover in real time. But that opportunity is only valuable if the data is reliable, connected, and private.

For founders and developers, the goal should not be to build “another fitness tracker” but to build systems that can learn and adapt. Systems that use data from any wearable, make sense of it instantly, and give people insights that actually matter.

The road is not easy. Integrations are messy, compliance is strict, and AI still has a long way to go. But solving these problems will unlock the next wave of innovation in health technology.

And if you are building something in that space, you should not have to start from zero.

Ready to Build Smarter Health Products?

If you are developing a digital health or wellness app and want to explore how wearables data can power it, our team at Momentum can help.

We specialize in designing and building intelligent health platforms — from mobile apps that integrate Apple Health and Garmin data, to AI systems that transform raw signals into real insights.

Let’s talk about your idea and see what we can build together. Book a Free Consultation →