No messaging SDK is HIPAA compliant by itself, and any vendor claiming otherwise is describing eligibility rather than compliance. What a vendor can offer is a signed BAA and a configuration that supports compliant use; whether the resulting system is compliant depends on how the implementing team configures and surrounds it. Evaluating an SDK therefore starts with the BAA but cannot end there — the questions that decide the outcome are where message data is stored and for how long, whether retention and deletion are actually controllable, how deep the audit logging goes, and what the vendor’s own staff and analytics can see. The failure that shows up most often in real applications is not the SDK at all: it is push notifications, where message content is handed to Apple or Google to render on a lock screen, putting PHI outside the BAA entirely unless the payload is deliberately stripped.

No SDK Is HIPAA Compliant

The correction worth leading with, because it’s the single most valuable thing this post can tell you: there’s no such thing as a certified “HIPAA-compliant SDK.” HIPAA has no certifying body and no compliance badge a vendor earns once. A vendor can sign a business associate agreement and ship a configuration that supports compliant use — but whether the system you build with it is actually compliant depends entirely on how your team implements, configures and operates it. Eligibility is the vendor’s job. Compliance is yours.

What a BAA Does and Doesn’t Cover

A business associate agreement obligates the SDK vendor to safeguard PHI it handles on your behalf and restricts how it can use that data — but it says nothing about your own application logs, your own retention practices, or your own analytics tooling. And it doesn’t stop at the SDK vendor: every subcontractor in that vendor’s own path — their cloud infrastructure provider, any analytics service they use internally — needs its own BAA coverage flowing down, or the chain breaks somewhere you never audited.

The Evaluation Checklist

Beyond “do they sign a BAA,” the questions that actually separate a defensible implementation from a liability:

  • Data residency — where is message content actually stored, and does that location matter for your compliance posture?
  • Retention and deletion control — can you actually enforce a retention policy, or does the vendor’s default behavior override what you configure?
  • Audit logging depth — does it record who accessed what and when, in a form you could actually produce during an audit?
  • Push notification handling — the next section, and the one most evaluations skip entirely
  • Vendor-side visibility — what can the vendor’s own staff and analytics tooling actually see into message content?

Push Notifications: The Most Common PHI Leak

This is the information-gain section, and it’s the specific insight almost never covered in an SDK comparison — a genuinely common, real-world way PHI leaks out of an otherwise well-built application. A standard push notification hands its content to Apple’s APNs or Google’s FCM to render on a lock screen. If that content includes anything derived from a patient message — a name, a snippet of the actual text — it has just left the boundary your BAA covers entirely, because Apple and Google are not your business associates for this purpose.

Doing this correctly means one of a few patterns: a silent push that triggers the app to fetch content locally without any PHI in the notification payload itself, a content-free alert (“You have a new message” rather than any specifics), or fetch-on-open behavior that pulls the actual content only once the user has opened and authenticated into the app. If your current messaging implementation puts patient names or message previews into a push payload, that’s worth fixing before anything else on this list.

Encryption: What HIPAA Actually Requires

A genuinely misunderstood distinction worth getting exactly right: encryption is classified as “addressable” under the Security Rule, at 45 CFR §164.312(a)(2)(iv) for data at rest and §164.312(e)(2)(ii) for data in transit — but addressable does not mean optional. It means you must implement it if reasonable and appropriate, or document a specific, defensible alternative if you don’t. In practice, regulators expect encryption as the default, and for data at rest that means NIST-validated standards like AES-128, AES-192 or AES-256. Skipping encryption without documenting a genuine, reasoned alternative is not a compliant choice — it’s a gap waiting to be found during an audit or a breach investigation.

Worth flagging directly: HHS’s proposed 2025 Security Rule update would eliminate the required/addressable distinction entirely and make every specification, including encryption, mandatory. That rule isn’t final as of this writing — verify its current status before treating this as settled, but plan your architecture as if encryption is non-negotiable regardless of how that rulemaking resolves.

Audit Logging Requirements

What has to be logged: who accessed a message, when, and what action they took. Logs need to be tamper-evident and retained long enough to actually be useful during an investigation, not just captured and discarded after a short window. This isn’t a nice-to-have for a messaging feature touching PHI — it’s core Security Rule territory, and it’s exactly the kind of gap an SDK’s marketing page won’t mention because it depends on how you configure the SDK, not on the SDK itself.

Build vs. Buy for Healthcare Messaging

An SDK is the right call when a vendor’s BAA, retention controls and push-handling model genuinely match your requirements — which, for a lot of straightforward messaging use cases, they do. The compliance surface argues for building your own when your requirements are unusual enough that no vendor’s default configuration gets you there safely, or when the vendor’s own logging and retention model can’t be shaped to what your specific use case demands. Most teams should evaluate honestly against the checklist above before assuming either direction.

Next Steps

If you’re evaluating a messaging SDK for a healthcare product, run it through the push-notification question first — it’s the one most teams miss, and it’s the one most likely to be quietly leaking PHI in a shipped product today. For the deeper picture on what actually makes an app HIPAA compliant beyond messaging specifically, see our HIPAA-compliant app development guide or our companion piece on healthcare app messaging. Or talk to our team directly about auditing your current implementation.