Most Used SDKs in Top 200 Free iOS Apps

Google AdMob 136 Apps (68% of Top 200)

AdMob helps a user monetize a mobile app through in-app advertising. Ads can be displayed as banner, interstitial, video, or native ads—which are seamlessly added to platform native UI components. AdMob uses the Google Mobile Ads SDK which helps app developers gain insights about their users and maximize ad revenue.
Facebook 109 Apps (55% of Top 200)

Facebook provides the easiest way to track success of App Ads, implement powerful sharing or let people log into an app with Facebook. Among other tools, this SDK provides anonymized audience insight about the people interacting with the app as well as a way for people to login to the app through Facebook. It also contains five component SDKs that can be connected to individually.

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Google Analytics 104 Apps (52% of Top 200)

Google Analytics provides insight on app usage, user engagement, and cross-network attribution. It is natively integrated with Firebase, Google's app developer platform, and provides unlimited reporting for up to 500 distinct events, helping to understand clearly how app users behave.
Facebook Core Kit 99 Apps (50% of Top 200)

The Facebook CoreKit SDK allows for sharing of data with Facebook, including information about users of the app. Facebook will use information received in accordance with their Data Use Policy.
Firebase 98 Apps (49% of Top 200)

Firebase is a mobile and web app development platform that provides developers with a plethora of tools and services to help them develop high-quality apps, grow their user base, and earn more profit.
Crashlytics 94 Apps (47% of Top 200)

Crashlytics is a powerful and lightweight tool that delivers interactive, detailed crash reports in realtime. Crashlytics performs deep analyses of each thread and uses a multi-symbolication process to provide progressively higher levels of detail. It is one of the modular kits contained within Fabric and is available in both iOSand Android versions.
Firebase Analytics 92 Apps (46% of Top 200)

Firebase is a Google Analytics for Firebase, a free and unlimited analytics solution. Analytics integrates across Firebase features and provides you with unlimited analytics solution.
Facebook Login 91 Apps (46% of Top 200)

Facebook Login provides a way for users to login to an app using their Facebook account. It also allows users to grant permissions to the app to access their information or perform actions on Facebook on their behalf. There are also identical SDK's available for android and web development.
Facebook Share Kit 87 Apps (44% of Top 200)

FB SDK ShareKitfor iOSpeople can also share content from your app to Facebook Messenger with Messenger Expression Platform or from Sharing's Message Dialog in iOSSDK.
Answers 78 Apps (39% of Top 200)

Answers provides realtime statistics on how the app is being used such as number of active users, session length, stability rating, and retention. Answers is one of the modular kits contained within Fabric and it is strongly suggested to be installed via Crashlytics.
Fabric 77 Apps (39% of Top 200)

Fabric is a mobile platform with three modular kits, Answers, Beta, and Crashlytics. The Answers SDK provides realtime analytics and event tracking, Beta allows for app distribution for beta testing, and Crashlytics provides detailed crash reporting.
Protobuf 77 Apps (39% of Top 200)

Protocol Buffers are Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data. Protocol Buffers currently support generated code in Java, Python, Objective-C, and C++
Twitter 77 Apps (39% of Top 200)

Using the Twitter API requires an authorized Twitter App and authenticated requests. The Twitter API supports a few authentication methods depending on the endpoint.
Google 70 Apps (35% of Top 200)

Google APIs is a set of application programming interfaces (APIs) developed by Google which allow communication with Google Services and their integration to other services.
AF Networking 68 Apps (34% of Top 200)

AFNetworking is an Objective-C networking library for iOSand Mac OS X that is built on top of the Foundation URL Loading System. This helps to extend the powerful high-level networking abstractions built into Cocoa. In addition to basic networking features, AFNetworking also includes more advanced ones such as Network Reachability and SSL Pinning. Also built by the Alamofire Software Foundation, Alamofire is the Swift equivalent of AFNetworking.
Google Networking Utilities 67 Apps (34% of Top 200)

GoogleNetworkingUtilities pods are methods that are shared between google libraries. GoogleNetworkingUtilities doesn't expose any headers and isn't intended for direct use.
Socket Rocket 59 Apps (30% of Top 200)

Socket Rocket Framework is a conforming WebSocket (RFC 6455) client library for iOS, macOS and tvOS. This is Facebook's SRWebSocket library.
Facebook Audience Network 58 Apps (29% of Top 200)

Facebook Audience Network is designed to maximize revenue with diverse demand from global advertisers. Facebook Audience Network helps you monetize your app by showing highly targeted ads that match the interests of your users.
Google Mobile ADS 57 Apps (28% of Top 200)

Google Mobile Ads enables publishers to monetize their mobile app through in-app advertising. It features streamlined APIs that provide access to mobile ad networks and advertising solutions. The Google AdMob SDK is a component of Google Mobile Ads.
AppsFlyer 51 Apps (26% of Top 200)

AppsFlyer offers you an amazing tool that allows you track customer experience and preference inorder to make better marketing decisions. The AppFlyers tool offers you top of the line marketing analytics that are guaranteed to improve your overall performance with over 2000 integrations for your mobile applications whether game, ecommerce or travel inclined.