> Mobile App Security Audit_
Once your app is in the App Store or Google Play, anyone can download it, unpack it and study how it works. What they find depends on decisions your team made months ago.
A mobile app security audit from Krasty Soft shows you those decisions from an attacker's point of view. We review the app and the backend it talks to, test how it stores and sends data, and give you a ranked list of fixes for both iOS and Android.
> When Does Your Business Need a Mobile App Security Audit?_
Mobile apps often hold more personal data than websites: location, contacts, health records, payment details. An audit makes sense in these situations:
- Before the first public release or a major version update.
- When the app handles payments, medical data, identity documents or other sensitive information.
- When a partner, bank or enterprise client asks for a security report before integration.
- Before compliance checks such as HIPAA, PCI DSS or GDPR.
- When the app was built by an external agency and your team has not reviewed its code.
- After a suspicious event, such as fake accounts, cloned apps or unusual API traffic.
> What Is Included in Our Mobile Application Security Audit_
A mobile application security audit looks at the app on the device, the network traffic and the server. We follow the OWASP Mobile Application Security Verification Standard (MASVS) and adapt it to your product.
Mobile Application Code Review
We review the source code of the app, whether it is native Swift or Kotlin, React Native or Flutter. Our review looks for hardcoded keys, unsafe use of web views, weak deep link handling, debug features left in release builds and insecure use of platform APIs.
Cross-platform apps need extra care. A React Native or Flutter bundle is easier to read than many teams expect, so any key or business rule shipped inside it should be treated as public.
Data Storage and Encryption Assessment
We check what the app keeps on the device and how. Tokens, personal data and cached files must be stored in the Keychain or Keystore, not in plain preferences or local databases.
We also review encryption: the algorithms in use, how keys are generated and stored, and whether sensitive storage is cleared on logout. Screenshots, logs, the clipboard and backups are checked for leaks too.
Authentication and Access Control Testing
We test sign-in, biometric unlock, one-time codes and session handling. We check whether credentials or tokens can be stolen or reused, and whether a session survives logout or a password change.
On the server side, we test authorization for every action the app can perform. A mobile client is easy to modify, so the server must never trust it to decide what a user may see or do.
Network and API Security Testing
We intercept and analyze the app's traffic to confirm that all connections use TLS and that certificate validation cannot be bypassed easily. Then we test the backend APIs the app calls for authentication, rate limits and excessive data in responses.
We also list the third-party SDKs in the app, such as analytics, ads, crash reporting and chat, and check what data each one sends and where. These SDKs are a common source of unexpected data sharing.
Reverse Engineering and Tampering Protection
We decompile the app the way an attacker would, to see which secrets and logic are exposed. We also test root and jailbreak detection, integrity checks, code obfuscation and certificate pinning, and how hard it is to bypass each of them.
> Common Mobile Application Security Risks and Vulnerabilities_
Our testing is based on the OWASP Mobile Top 10. The issues we find most often in mobile apps are:
- Insecure data storage: tokens, passwords or personal data saved in plain text on the device.
- Hardcoded secrets: API keys and service credentials embedded in the app bundle.
- Weak authentication: sessions that never expire, or local checks that can be skipped.
- Insecure communication: missing or misconfigured TLS and certificate validation.
- Broken server-side authorization: the API trusts whatever the app sends.
- Excessive permissions and data collection that put user privacy at risk.
- Insufficient protection against reverse engineering, cloned apps and modified builds.
> Our Mobile App Security Audit Process_
Each mobile app security assessment follows the same five steps.
- Scoping
We agree on platforms, app versions, user roles and backend components, and confirm the price and timeline.
- Setup
You provide test builds, test accounts and, ideally, access to the source code.
- Analysis
We combine static analysis of the code and binary with dynamic testing on real devices.
- Reporting
Each confirmed vulnerability is rated by severity and explained with impact, evidence and a fix.
- Debrief and verification
We review the results with your developers and can retest the fixed build.
> Benefits of a Professional Mobile App Audit_
A professional mobile application security assessment gives your team clarity and your users confidence:
Protected user data on the device, in transit and on the server.
Lower risk of fraud, account takeover and cloned apps.
Smoother app store reviews and partner security checks.
Evidence for compliance with privacy and data protection rules.
A clear, prioritized fix list for your iOS and Android developers.
> Industries & Use Cases_
We audit mobile apps where trust is part of the product: telemedicine and patient apps, banking and payment apps, ecommerce and loyalty apps, and field service tools used by employees. The test plan reflects the data each app holds.
For a health app, the focus is on records stored offline and shared with other apps. For a fintech app, it is on transaction signing, session timeouts and protection against modified builds.
A mobile audit can be ordered on its own or as part of a broader application security audit together with your web app and APIs.
> FAQ About Mobile App Security Audit_
Here are answers to the questions we are asked most often about mobile audits.
Can You Audit a Mobile App Before It Is Released?
Yes, and it is the best time to do it. We can work with TestFlight or internal test builds, so issues are fixed before the app reaches the stores. Fixing a flaw before release is also cheaper, because you do not have to wait for users to update.
Can You Perform a Security Audit Without Access to the Source Code?
Yes. We can analyze the compiled app, its storage and its network traffic, as an outside attacker would. Access to the source code makes the audit deeper and faster, so we recommend it when possible.
Can a Mobile App Security Audit Detect Reverse Engineering and Code Tampering Risks?
Yes. We decompile the app, look for exposed secrets and logic, and test how easily integrity checks, root detection and pinning can be bypassed. The report explains which protections are worth adding for your risk level.
How Long Does a Mobile App Security Assessment Take?
A typical assessment of one app on both platforms takes one to two weeks. The timeline depends on the number of features, user roles and backend services in scope.