Mobile Application Testing

What Mobile Application Security Testing Is (and Who It's For)

Mobile application testing is the process of assessing how an app behaves, performs, and holds up under real-world conditions. On this page, the focus is mobile application security testing: the specialist penetration testing discipline that probes an app for exploitable weaknesses before an attacker finds them.

This is a different question from functional or QA testing. Functional testing asks whether the app works as intended. Security testing asks whether the app can be abused, whether sensitive data can be exposed, and whether its backend and third-party connections can be turned against you. It is worth being plain about a common misconception here: automated QA testing tools do not cover security. They answer different questions, and a green build in your QA pipeline tells you nothing about whether your app leaks data or exposes an insecure API.

Those are different questions, and passing one says nothing about the other. An app can pass every functional test case and still leak credentials from local storage or expose an unauthenticated API. The service covers iOS, Android, or both, and is designed for teams and organisations that need genuine assurance rather than a functional sign-off.

It is a good fit if you are:

• Building an app that is approaching launch and want pre-release risk assurance.
• Running an app already in production that has never had an independent security assessment.
• Facing a compliance obligation or a client security requirement you need to satisfy.
• Handling personal or sensitive data and need to demonstrate UK data protection diligence.

For UK and London-based teams in particular, independent security testing supports UK data protection obligations and gives clients and stakeholders confidence that the app has been assessed against real-world attack techniques rather than functional checks alone. Independent testing gives you an outside view your own developers cannot provide, since they are testing the system they built.

What the Testing Covers and How to Choose the Right Scope

A professional mobile app security test looks well beyond the app binary. It examines:

• Insecure data storage on the device.
• The API and backend attack surface the app talks to.
• Authentication and session handling.
• Third-party SDK and supply-chain risk.
• Platform-specific weaknesses in how iOS or Android handle credentials, storage, and inter-app communication.

The right scope depends on your app type and where its risk concentrates.

Match the scope to your app type

Native, hybrid, and web-based mobile apps differ mainly in attack surface rather than category.

A native app exposes more platform-level behaviour and on-device storage risk. A hybrid or web-wrapped app inherits web vulnerabilities such as injection and cross-site scripting alongside its mobile shell. Knowing which model your app uses helps scope the test toward where flaws are most likely to sit, and how much backend testing the engagement should include.

Why device fragmentation is a security concern

Device fragmentation is often treated as a QA inconvenience. For security it is an expanded attack surface: different OS versions, manufacturer modifications, and rooted or jailbroken devices each change how data is protected and how an attacker might reach it.

This is why real-device testing matters for security-relevant behaviour that emulators cannot reliably reproduce, and why automated scanning alone is not enough. Tooling accelerates coverage, but expert manual analysis finds the business-logic and context-specific flaws that scanners cannot reason about, such as a payment flow that can be replayed or an access control that can be bypassed by changing a single request.

Functional testing vs security testing

If your driver is release readiness, functional testing is the wrong tool; choose a security engagement scoped to your platform and data sensitivity. As a rule, deeper scope suits apps with more sensitive data, more backend integration, or a formal compliance need. Current package options and depth are shown in the product listings.

Compatibility and Buying Checks Before You Engage

Before testing starts, a specialist typically needs:

• A working app build (or store/TestFlight access)
• Test credentials or accounts
• Access to any staging or test environment
• A defined scope covering which platforms and backend components are in play

Having these ready avoids delays and keeps the engagement focused on finding issues rather than gaining access.

In-house QA and automated tools are enough when you are checking that features work and stay stable. A specialist security test is warranted when the stakes shift from "does it work?" to "can it be attacked?"

Use this quick self-check. Engage a specialist if:

• You are launching a new app or a major release that handles user data.
• A client, partner, or auditor has requested independent security testing.
• Your app processes personal, payment, health, or otherwise sensitive information.
• A compliance obligation calls for evidence of security assurance.
• Your app integrates third-party SDKs or a backend API you have not had independently reviewed.

If none of these apply and you are only validating behaviour, your existing QA process may be sufficient for now.

Both iOS and Android can be tested, on real devices where security-relevant behaviour requires it rather than relying solely on emulators. Testing is performed against non-production or controlled environments and credentials wherever possible so that your data and live users are protected throughout. Confirm the exact scope and platform coverage against the current product options before you commit.

Deliverables and Buying Confidence

The value of a security test lives in the report, not the test itself. A useful engagement gives you findings you can act on, not a raw scanner dump. Expect:

• A prioritised findings report ranking issues by real business impact and exploitability.
• Developer-actionable remediation guidance that explains how to fix each issue, not just that it exists.
• A retest option to confirm fixes have closed the vulnerabilities.
• Evidence suitable for compliance and client security assurance requirements.

The distinction competitors gloss over is report quality. A compliance box-tick report lists vulnerabilities and stops there. A developer-actionable report explains the impact, shows the exploit path, and tells your engineers exactly what to change, which is the difference between a document you file and a document that improves your app.

A prioritised report also lets you fix what matters most first, rather than treating every finding as equally urgent. Organisations commission this testing for pre-release risk reduction, to meet client security requirements, and to support compliance obligations. For current package specifics and how to start an engagement, see the live product listings.

Frequently Asked Questions