Most Used SDKs in Top 200 Free iOS Apps

Google AdMob 131 Apps (66% 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.
Google Analytics 95 Apps (48% 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.

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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.
Facebook 94 Apps (47% 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.
Answers 88 Apps (44% 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.
Twitter 88 Apps (44% 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.
Fabric 87 Apps (44% 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.
Firebase 87 Apps (44% 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.
Firebase Analytics 82 Apps (41% 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 Core Kit 81 Apps (41% 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.
Google 77 Apps (39% 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.
Google Networking Utilities 75 Apps (38% 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.
Protobuf 75 Apps (38% 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++
Facebook Share Kit 74 Apps (37% 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.
AF Networking 72 Apps (36% 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.
Facebook Login 71 Apps (36% 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.
SD Web Image 67 Apps (34% of Top 200)

SD WebImage is a library that provides an asynchronous image downloader with memory and disk image caching. It includes categories for user interface elements such as UIImageView, UI Button, and MKAnnotationView.
Socket Rocket 65 Apps (33% 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.
Google Utilities 55 Apps (28% of Top 200)

Google utilities are several tools made available by Google to developers and other individuals to use on permission. These tools range from Google Sheets, Google Docs, Google Slides, and Google Maps, to name a few.
Bolts 51 Apps (26% of Top 200)

Bolts is a collection of low-level libraries designed to make developing mobile apps easier. These libraries, originally created by Facebook and Parse, have been open sourced and made available to others without a mandatory Facebook developer or Parse affiliation. Bolts includes "tasks", which make organization of complex asynchronous code more manageable, and an implementation of the App Links Protocol, which helps link content in other apps.