Gourav DhimanA single mobile app collecting user emails, location data and payment details can fall under a dozen different privacy laws before it even leaves the app store review queue. That's not an exaggeration. Between the EU's GDPR, a growing list of US state privacy laws, platform-level rules from Apple and Google, and sector-specific regulations layered on top, most business apps now operate inside a compliance landscape that didn't exist five years ago in anywhere near this shape.
This article walks through the regulations that actually apply to mobile app development right now, what each one specifically requires from an app rather than a website, and where developers most commonly get tripped up. The goal isn't to turn you into a privacy lawyer. It's to give you a clear enough picture that you know which conversations to have with one, and which requirements you can implement directly in your development process.
Why mobile apps face a different privacy standard than websites
A website mostly deals with cookies, form submissions and maybe an IP address. A mobile app has access to a phone's camera, microphone, precise location, contacts, photo library, health sensors and a persistent device identifier that can track a user across sessions without them realizing it. Regulators and platform owners have responded accordingly, treating apps as a higher-risk surface than the average webpage.
This shows up in two overlapping layers of obligation. The legal layer comes from governments: GDPR, state privacy laws, COPPA and similar statutes that carry real financial penalties. The platform layer comes from Apple and Google, who enforce their own privacy rules as a condition of appearing in their stores at all. An app can be fully compliant with the law and still get rejected or pulled from a store for failing a platform requirement, and the reverse is also true. Both layers need attention, and they don't always ask for exactly the same thing.
GDPR: still the reference point, even outside the EU
The General Data Protection Regulation applies to any app that processes personal data belonging to someone in the EU, Norway, Iceland, Liechtenstein, the UK or Switzerland, regardless of where the company itself is based. If your app has any EU user base at all, and most apps distributed globally through the App Store or Play Store do, GDPR applies.
For a mobile app specifically, two provisions matter most in practice. GDPR requires data protection by design and by default, which means privacy considerations need to shape the app's architecture from the start rather than get bolted on before launch, things like collecting only the data a feature genuinely needs and encrypting sensitive data both at rest and in transit. It also requires that consent for anything beyond strictly necessary processing be freely given and specific, which in practice means an app can't make core functionality contingent on a user accepting analytics or marketing tracking they never agreed to.
GDPR also gives users a defined set of rights, access to their data, correction, deletion, portability and the ability to restrict processing, and these need to be genuinely actionable from inside the app rather than buried behind a support email address that takes weeks to answer. Some organizations, depending on the scale and nature of data they process, are also required to appoint a Data Protection Officer and list that person's contact details in the privacy policy.
The US state privacy law patchwork
This is where things have gotten noticeably more complicated over the past two years. Twenty states now have comprehensive consumer privacy laws in effect, with Indiana, Kentucky and Rhode Island joining the list as of January 2026, and several earlier laws, including California's, Colorado's and Connecticut's, have since been amended with stricter requirements. If your app is available on the App Store or Play Store without geographic restriction, which is the default for almost every app, users from any of these states can download it, and the relevant law applies the moment they do.
California remains the most consequential, largely because the California Consumer Privacy Act and its successor, the California Privacy Rights Act, were the first of their kind and set the template many other states borrowed from. As of 2026, CPRA's rules around automated decision-making technology, mandatory risk assessments and cybersecurity audits are now applicable, and businesses must honor Global Privacy Control signals as a valid opt-out request rather than requiring users to find a separate toggle inside the app.
Across the twenty state laws, a few requirements repeat consistently enough to treat as a baseline. Nineteen of the twenty require opt-in consent, not just notice, before processing sensitive personal data, which typically includes health information, biometric data, precise geolocation, racial or ethnic origin and financial account details. All twenty grant users the right to access, delete, correct and receive a portable copy of their data, along with the right to opt out of data sales and targeted advertising. A handful of states go further with requirements unique to them. Colorado mandates formal privacy risk assessments for high-risk processing. Connecticut's mid-2026 update added a specific disclosure requirement for any app using data to train large language models. Texas requires a verbatim notice for sensitive and biometric data sales that no other state currently replicates.
Building a separate compliance program for each of twenty states isn't realistic for most teams. The workable approach is to build to the strictest common requirements across the states where your actual user base is concentrated, then handle genuine outliers, like Texas's biometric notice, as specific additions rather than starting from scratch each time.
Children's privacy: COPPA's amended rule is now fully enforceable
The Children's Online Privacy Protection Act has applied to child-directed apps for years, but the rule itself hadn't been substantially updated since 2013. That changed with amendments the FTC finalized in January 2025, which became effective in June 2025 and reached full compliance enforcement on April 22, 2026. Any gap that existed before that date is now genuine enforcement exposure rather than a grace period.
The updated rule matters to a wider set of apps than the name suggests. COPPA applies not only to apps clearly designed for children under 13, but to any "mixed audience" app where an operator has actual knowledge that children are using it, and the amended rule expanded the factors the FTC will use to make that determination, including user reviews that mention children, the age profile of users on similar apps, and marketing materials. An app that never intended to serve children can still fall under COPPA if the evidence points that way.
Substantively, the amendments add three requirements worth knowing in detail. Operators must now obtain separate, specific parental consent before sharing a child's personal information with third parties for targeted advertising, rather than relying on one general consent covering everything. Data retention is now explicitly capped: children's personal information can't be kept longer than necessary for the specific purpose it was collected for, and operators must publish a retention policy and follow an internal deletion schedule rather than holding data indefinitely by default. And the rule adds more prescriptive security requirements, meaning a documented, appropriately scaled security program rather than an informal assumption that things are handled.
Separately from COPPA, some individual states have begun layering their own app-specific children's protections on top, including app store accountability laws in states like Utah and Alabama that place age-verification and parental control obligations directly on app stores and developers, and Maryland's broader online data privacy law, which took effect in April 2026 with some of the strictest data minimization requirements for minors currently on the books. If your app has any plausible child audience, this is an area worth getting specific legal advice on rather than relying on general guidance, since the FTC has signaled it intends to enforce actively.
Platform-level privacy rules: Apple and Google
Separate from the law, Apple and Google both enforce their own privacy requirements as a condition of distribution, and these apply regardless of where your company is based or which users you're targeting.
Apple's App Tracking Transparency framework, in place since iOS 14.5, requires apps to show an explicit system-level prompt before tracking a user across other companies' apps or websites, and the app must respect the user's choice if they decline. Separately, Apple's App Privacy section, often called the privacy nutrition label, requires developers to complete a detailed questionnaire in App Store Connect describing what data the app collects, whether that data is linked to the user's identity, and whether it's used for tracking. This label is publicly visible on the app's store page before anyone downloads it, and it has to accurately reflect what the app actually does, including data collected by third-party SDKs bundled into the app rather than written by the developer directly. A mismatch between the declared label and the app's real behavior is one of the more common reasons for App Store rejection.
Google Play's equivalent is the Data Safety section, introduced in 2022 and completed through a structured questionnaire in Play Console. It covers similar ground: what data types the app collects or shares, whether that collection is optional, whether the data is encrypted in transit, and whether users can request deletion. Like Apple's label, it has to match the app's actual behavior and the associated privacy policy, and it needs to account for every SDK integrated into the app, not just data your own code collects directly.
The practical lesson from both systems is the same. Your privacy policy, your platform declarations and your app's actual runtime behavior all need to agree with each other. Auditing what every third-party library in your app actually does, rather than just what you intended it to do, is the step most teams skip and most regret skipping.
Sector-specific rules that catch teams off guard
General privacy law isn't the whole picture. If your app touches certain categories of data, additional regulation applies on top of everything above, and it's easy to miss because it doesn't show up in a generic "mobile app privacy" checklist.
A health or fitness app that handles data on behalf of a covered healthcare provider in the US may fall under HIPAA, which has its own, considerably stricter security and breach notification requirements than general consumer privacy law. A finance or payments app handling card data needs to account for PCI DSS on the payment side, separate from privacy law entirely. And if your app serves users in a country with its own comprehensive privacy framework, Brazil's LGPD, Singapore's PDPA or India's Digital Personal Data Protection Act among them, that framework applies independently of whatever US or EU compliance work you've already done. These laws share a family resemblance with GDPR in their broad structure, but the specific consent mechanics, timelines and penalties differ enough that assuming GDPR compliance automatically covers them is a mistake.
Common mistakes that cause real problems
A few patterns show up repeatedly across apps that run into compliance trouble, and most of them are avoidable with earlier planning rather than better lawyers.
The most frequent is treating the privacy policy as a document written after development finishes, disconnected from what the app actually does. Regulators and platform reviewers both check for consistency between what's declared and what's observed, and a generic privacy policy template that doesn't reflect your specific data flows is a liability rather than protection. Closely related is failing to audit third-party SDKs. Analytics tools, ad networks and crash reporting libraries often collect more than a development team realizes, and that collection is legally attributed to the app regardless of who wrote the code.
Another common failure is bundling consent, asking for permission to use analytics, marketing and core functionality all in one bundled prompt, which several state laws and GDPR both treat as invalid consent since it isn't specific or freely given. A fourth is neglecting deletion and retention. Building the ability to collect data is usually straightforward; building the ability to actually delete a specific user's data on request, across every system that data touches, is the part teams underestimate, and it's exactly the capability most of these laws require.
Building compliance into the development process, not after it
The teams that handle this well treat privacy as a design constraint from the first sprint rather than a legal review at the end. That means mapping what data each feature actually needs before building it, rather than collecting broadly and figuring out the justification later. It means choosing SDKs and third-party services with their own data practices in mind, not just their functionality. And it means building the account deletion and data export flows early, since retrofitting them into an app with years of accumulated, scattered data stores is a much larger project than building them in from the start.
None of this replaces qualified legal advice, particularly once your app operates across multiple jurisdictions or touches sensitive categories like health or children's data. But a development team that understands the shape of these requirements, and builds toward them from the first technical decision, saves itself a genuinely painful retrofit later, and avoids the app store rejections that come from a mismatch between what you say and what your app does.
Frequently Asked Questions
At minimum, whenever you add a new SDK, launch a new feature that touches user data, or expand into a new market or state. Given how frequently state privacy laws have changed in the past two years, an annual review even without a specific trigger is a reasonable baseline for most active apps.
The underlying data audit can largely be shared, since both are asking about the same actual data practices, but the two questionnaires are structured differently and don't map one to one. Each needs to be completed separately and checked against your privacy policy independently.
The FTC's amended rule broadened this considerably. It can include user reviews mentioning children, age patterns visible in how the app is used, or even the demographic profile of similar apps in the same category. There's no single clean threshold, which is why apps with any plausible child audience should treat COPPA as a live consideration rather than something to revisit only if a complaint arrives.
Generally no. Most teams write one privacy policy built to the strictest common requirements across the states where they have meaningful user numbers, then add specific provisions for genuine outliers, such as Texas's verbatim biometric data notice, rather than maintaining twenty separate documents.
Not automatically, but verifying that is harder than it sounds. If your app is available globally through the App Store or Play Store without geographic restriction, EU users can and often will download it, and GDPR applies the moment they do. Geo-restricting distribution is the only reliable way to exclude EU users entirely.
