How to See an App's Tech Stack Without Decompiling It

You can learn most of an app's tech stack without ever opening a decompiler. Decompilation is slow, legally murky, and often unnecessary: a surprising amount of an app's architecture leaks through public artifacts — the store listing, the package layout, the binary's string tables, and the hosts it talks to on first launch. This is how competitive-intelligence tools build SDK profiles at scale, and you can do a lighter version of it by hand.

This post focuses on the non-decompiling path: what you can read from files that ship in the open, and from observable behavior, without disassembling anyone's code.

Start with the store listing, not the binary

The cheapest signals are the ones the developer publishes themselves. On both stores the public listing already narrows the stack considerably:

• Privacy disclosures. Apple's privacy "nutrition labels" and Google Play's Data safety section enumerate data types collected and link them to purposes like analytics, advertising, or crash reporting. A label that declares "Coarse Location → Advertising" plus "Device ID → Third-party Advertising" almost always means an ad-mediation SDK is present.
• Permissions (Android). Google Play surfaces requested permissions. com.android.vending.BILLING means Play Billing; BLUETOOTH_* plus background location hints at a proximity/beacon SDK; a cluster of ad-network permissions points to a specific mediation vendor.
• Category and update cadence. A hyper-casual game shipping weekly is almost certainly on a live-ops/remote-config SDK and a heavy ad stack. Slow, deliberate updates suggest a leaner native build.

None of this requires unpacking anything. Our app market intelligence tool is built on exactly these public listing signals, aggregated across hundreds of thousands of apps.

Read the package as a ZIP, not as code

An IPA and an APK are both just ZIP archives. Unzipping them is not decompilation — you're inspecting files the developer chose to bundle, in their original structure. This is where the highest-confidence SDK signals live.

Android (APK):

unzip -l app.apk            # list the archive contents
# directory names under the smali/dex namespace map to SDKs

You don't need to decompile the DEX to see the namespaces — tools like apkanalyzer dex packages app.apk (ships with the Android SDK) print the class package tree. Folder and namespace prefixes are dead giveaways:

• com/google/android/gms/ads → AdMob
• com/facebook/ → Meta SDK (login, ads, or analytics)
• io/branch/ → Branch deep linking
• com/amplitude/ → Amplitude analytics

The assets/, lib/ (native .so files), and META-INF/ folders add more: a libunity.so confirms Unity; libflutter.so confirms Flutter; libhermes.so is React Native's JS engine. The resources.arsc and merged manifest list declared services and providers — many SDKs register a ContentProvider for auto-initialization, which shows up by name.

iOS (IPA):

unzip app.ipa
ls Payload/AppName.app/Frameworks/    # embedded dynamic frameworks

Each .framework here is a third-party dependency named more or less honestly (FBSDKCoreKit.framework, GoogleMobileAds.framework). Running strings over the main binary surfaces SDK version constants, class prefixes, and sometimes bundled endpoint hostnames — again, reading strings is not reverse-engineering logic.

Practical note: getting a decrypted iOS binary off a device legitimately is harder than grabbing an APK. For most research you can stay on Android artifacts plus the cross-platform store and network signals below.

Detect the cross-platform framework first

Before you chase individual SDKs, classify the shell. Knowing whether an app is native, React Native, Flutter, Unity, or a WebView wrapper changes everything downstream:

Signal	Framework
libflutter.so, flutter_assets/	Flutter
libhermes.so / index.android.bundle	React Native
libunity.so, assets/bin/Data	Unity
libcocos2d, assets/res	Cocos
Mostly WebView, a bundled index.html	Hybrid (Capacitor/Cordova)

A Flutter app, for example, won't be carrying a pile of native ad SDKs — it'll use Flutter-plugin wrappers, which changes how you read the namespaces.

Confirm with network behavior

Static signals tell you what's bundled; network capture tells you what's active. Run the app once through an HTTPS-inspecting proxy (mitmproxy, Charles, Proxyman) on a device you own, and watch the first-launch traffic. Stable hostnames are reliable fingerprints:

• app-measurement.com → Firebase/Google Analytics
• graph.facebook.com → Meta SDK
• *.adjust.com, *.appsflyer.com → attribution
• sdk.split.io, *.launchdarkly.com → feature flags

Endpoints are the tie-breaker when two SDKs share a namespace, and they reveal backend choices (Firebase vs. a custom API, a specific CDN, a particular auth provider) that no manifest exposes. We cover the full namespace-and-endpoint methodology in how to find what SDKs and tech stack an app uses.

Cross-check, then move on

Any single signal can mislead — a vendored copy, a renamed class, a dead dependency that ships but never runs. Confidence comes from agreement: a com.google.android.gms.ads namespace and an AdMob permission and traffic to googleads.g.doubleclick.net is a near-certain AdMob deployment. One signal alone is a hypothesis.

For one app, the manual ZIP-and-proxy loop is fine. To compare a whole category, you want this fingerprinting done across many apps at once — which is the job of an app intelligence platform rather than a single afternoon. Either way, no decompiler required.

FAQ

Is unzipping an APK or IPA the same as decompiling? No. Unzipping reads the archive's existing files — frameworks, native libraries, assets, the manifest — in the form the developer shipped them. Decompiling means reconstructing source code from compiled bytecode or machine code, which is a separate, heavier, and legally riskier step you can usually skip.

How accurate is fingerprinting without source code? High for presence of major SDKs when multiple signals agree (namespace + permission + network host). Lower for exact versions or for SDKs that are bundled but inactive. Always corroborate static signals with observed network traffic.

Can I do all of this on iOS? Partially. Store listing, privacy labels, and network capture work on any platform. Inspecting the IPA's bundled frameworks requires a decrypted binary, which is more involved than pulling an APK — so iOS-only research leans more heavily on store and network signals.