Platform
Category
Top 20 User Authentication SDKs Used in iOS Apps on the Apple App Store
Last update: 13 Sep 2025 CET
App Store

Top 20 User Authentication SDKs Used in iOS Apps on the Apple App Store

We at 42matters have identified the 20 most popular User Authentication SDKs leveraged by iOS apps available on the iOS app market.

User Authentication SDKs enable developers to add user authentication capabilities, such as login, registration, and access control, to their mobile apps. They commonly offer user management, identity verification, password reset, and other related capabilities.

This list is based on our analysis of the millions of mobile applications – and the 2,300+ SDKs they use – that constitute the vast inventory of the Apple App Store. The accompanying data provides readers with a glimpse into the rich mobile application insights generated by the 42matters technology. This data is also available via our APIs, file dumps, Explorer, and SDK Explorer.

The intended purpose of this article is to assist app builders in their search for the perfect User Authentication SDK to leverage in their app, as well as to give SDK developers insight into their biggest competitors and potential customers. This data collected by our technology may also serve as a useful tool for folks researching the wider mobile app market.

Among all apps utilizing user authentication SDKs, 48.62% have integrated AppAuth by OpenID. This accounts for 50.98% of app downloads within the user authentication SDK category.

AppAuth for Android is a client SDK for communicating with OAuth 2.0 and OpenID Connect providers. It strives to directly map the requests and responses of those specifications, while following the idiomatic style of the implementation language.

Total Apps
212.90k
App Store
App Share
48.62%
App Store
Apps
206.56k
Games
6.33k
Total Downloads
111.28b
App Store
Download Share
50.98%
App Store
App Downloads
101.06b
Game Downloads
10.22b

Use the 42matters SDK Explorer to find all apps that use AppAuth by OpenID.

Among all apps utilizing user authentication SDKs, 43.08% have integrated Firebase Authentication. This accounts for 21.27% of app downloads within the user authentication SDK category.

Total Apps
188.64k
App Store
App Share
43.08%
App Store
Apps
177.30k
Games
11.35k
Total Downloads
46.43b
App Store
Download Share
21.27%
App Store
App Downloads
34.47b
Game Downloads
11.97b

Use the 42matters SDK Explorer to find all apps that use Firebase Authentication.

Among all apps utilizing user authentication SDKs, 34.25% have integrated Apple Accounts. This accounts for 32.84% of app downloads within the user authentication SDK category.

Total Apps
149.96k
App Store
App Share
34.25%
App Store
Apps
122.09k
Games
27.87k
Total Downloads
71.68b
App Store
Download Share
32.84%
App Store
App Downloads
50.74b
Game Downloads
20.94b

Use the 42matters SDK Explorer to find all apps that use Apple Accounts.

Among all apps utilizing user authentication SDKs, 17.26% have integrated Google reCAPTCHA. This accounts for 13.85% of app downloads within the user authentication SDK category.

Total Apps
75.59k
App Store
App Share
17.26%
App Store
Apps
72.67k
Games
2.93k
Total Downloads
30.24b
App Store
Download Share
13.85%
App Store
App Downloads
22.95b
Game Downloads
7.29b

Use the 42matters SDK Explorer to find all apps that use Google reCAPTCHA.

Among all apps utilizing user authentication SDKs, 2.95% have integrated Amazon AWS Cognito Federated Identities. This accounts for 4.27% of app downloads within the user authentication SDK category.

Total Apps
12.92k
App Store
App Share
2.95%
App Store
Apps
12.52k
Games
400
Total Downloads
9.31b
App Store
Download Share
4.27%
App Store
App Downloads
6.85b
Game Downloads
2.46b

Use the 42matters SDK Explorer to find all apps that use Amazon AWS Cognito Federated Identities.

Among all apps utilizing user authentication SDKs, 1.30% have integrated Microsoft Authentication Library. This accounts for 2.33% of app downloads within the user authentication SDK category.

Total Apps
5.69k
App Store
App Share
1.30%
App Store
Apps
5.68k
Games
11
Total Downloads
5.09b
App Store
Download Share
2.33%
App Store
App Downloads
5.09b
Game Downloads
2.45m

Use the 42matters SDK Explorer to find all apps that use Microsoft Authentication Library.

Among all apps utilizing user authentication SDKs, 1.18% have integrated Mitek MiSnap. This accounts for 1.95% of app downloads within the user authentication SDK category.

Mitek MiSnap is a patented mobile capture SDK that enables an intuitive user experience and instant capture of quality images.

Total Apps
5.18k
App Store
App Share
1.18%
App Store
Apps
5.18k
Games
0
Total Downloads
4.26b
App Store
Download Share
1.95%
App Store
App Downloads
4.26b
Game Downloads
343

Use the 42matters SDK Explorer to find all apps that use Mitek MiSnap.

Among all apps utilizing user authentication SDKs, <1% have integrated OAuthSwift. This accounts for <1% of app downloads within the user authentication SDK category.

OAuthSwift is a Swift-based OAuth library SDK for iOS and macOS.

Total Apps
4.26k
App Store
App Share
<1%
App Store
Apps
4.25k
Games
7
Total Downloads
661.24m
App Store
Download Share
<1%
App Store
App Downloads
651.48m
Game Downloads
9.75m

Use the 42matters SDK Explorer to find all apps that use OAuthSwift.

Among all apps utilizing user authentication SDKs, <1% have integrated Auth0. This accounts for <1% of app downloads within the user authentication SDK category.

Auth0 is an easy to implement, adaptable authentication and authorization platform. They make your login box awesome.

Total Apps
4.22k
App Store
App Share
<1%
App Store
Apps
4.21k
Games
5
Total Downloads
1.32b
App Store
Download Share
<1%
App Store
App Downloads
1.31b
Game Downloads
11.50m

Use the 42matters SDK Explorer to find all apps that use Auth0.

Among all apps utilizing user authentication SDKs, <1% have integrated FCUUID. This accounts for 1.08% of app downloads within the user authentication SDK category.

FCUUID is an iOS UUID library SDK and an alternative to UDID and identifierForVendor. This library provides the simplest API to obtain universally unique identifiers with different levels of persistence.

Total Apps
3.62k
App Store
App Share
<1%
App Store
Apps
3.43k
Games
189
Total Downloads
2.36b
App Store
Download Share
1.08%
App Store
App Downloads
2.11b
Game Downloads
242.24m

Use the 42matters SDK Explorer to find all apps that use FCUUID.

Among all apps utilizing user authentication SDKs, <1% have integrated FraudForce by iovation. This accounts for 2.20% of app downloads within the user authentication SDK category.

Total Apps
2.42k
App Store
App Share
<1%
App Store
Apps
2.40k
Games
18
Total Downloads
4.81b
App Store
Download Share
2.20%
App Store
App Downloads
4.81b
Game Downloads
3.30m

Use the 42matters SDK Explorer to find all apps that use FraudForce by iovation.

Among all apps utilizing user authentication SDKs, <1% have integrated OTPless. This accounts for <1% of app downloads within the user authentication SDK category.

Total Apps
1.85k
App Store
App Share
<1%
App Store
Apps
1.85k
Games
4
Total Downloads
442.27m
App Store
Download Share
<1%
App Store
App Downloads
437.84m
Game Downloads
4.42m

Use the 42matters SDK Explorer to find all apps that use OTPless.

Among all apps utilizing user authentication SDKs, <1% have integrated Kount by Equifax. This accounts for 1.12% of app downloads within the user authentication SDK category.

Total Apps
1.13k
App Store
App Share
<1%
App Store
Apps
1.13k
Games
5
Total Downloads
2.44b
App Store
Download Share
1.12%
App Store
App Downloads
2.44b
Game Downloads
154.27k

Use the 42matters SDK Explorer to find all apps that use Kount by Equifax.

Among all apps utilizing user authentication SDKs, <1% have integrated SumSub. This accounts for <1% of app downloads within the user authentication SDK category.

Total Apps
1.09k
App Store
App Share
<1%
App Store
Apps
1.04k
Games
47
Total Downloads
857.78m
App Store
Download Share
<1%
App Store
App Downloads
683.35m
Game Downloads
174.44m

Use the 42matters SDK Explorer to find all apps that use SumSub.

Among all apps utilizing user authentication SDKs, <1% have integrated FingerprintJS. This accounts for 1.43% of app downloads within the user authentication SDK category.

Total Apps
1.01k
App Store
App Share
<1%
App Store
Apps
965
Games
49
Total Downloads
3.12b
App Store
Download Share
1.43%
App Store
App Downloads
2.83b
Game Downloads
290.94m

Use the 42matters SDK Explorer to find all apps that use FingerprintJS.

Among all apps utilizing user authentication SDKs, <1% have integrated Sinch. This accounts for <1% of app downloads within the user authentication SDK category.

Sinch is an SDK that enables developers to connect with customers and make engagement personal with simple, programmable SMS, voice, video, and verification tools.

Total Apps
971
App Store
App Share
<1%
App Store
Apps
970
Games
1
Total Downloads
389.23m
App Store
Download Share
<1%
App Store
App Downloads
389.22m
Game Downloads
10.31k

Use the 42matters SDK Explorer to find all apps that use Sinch.

Among all apps utilizing user authentication SDKs, <1% have integrated Facetec. This accounts for 3.07% of app downloads within the user authentication SDK category.

Total Apps
856
App Store
App Share
<1%
App Store
Apps
851
Games
5
Total Downloads
6.71b
App Store
Download Share
3.07%
App Store
App Downloads
6.70b
Game Downloads
15.41m

Use the 42matters SDK Explorer to find all apps that use Facetec.

Among all apps utilizing user authentication SDKs, <1% have integrated iProov. This accounts for <1% of app downloads within the user authentication SDK category.

Total Apps
772
App Store
App Share
<1%
App Store
Apps
765
Games
7
Total Downloads
1.58b
App Store
Download Share
<1%
App Store
App Downloads
1.58b
Game Downloads
1.36m

Use the 42matters SDK Explorer to find all apps that use iProov.

Among all apps utilizing user authentication SDKs, <1% have integrated Onfido Capture. This accounts for 1.27% of app downloads within the user authentication SDK category.

The Onfido Capture SDK is an AI-based technology that assesses whether a user’s government-issued ID is genuine or fraudulent. It then compares it against their facial biometrics.

Total Apps
736
App Store
App Share
<1%
App Store
Apps
714
Games
22
Total Downloads
2.77b
App Store
Download Share
1.27%
App Store
App Downloads
2.76b
Game Downloads
18.54m

Use the 42matters SDK Explorer to find all apps that use Onfido Capture.

Among all apps utilizing user authentication SDKs, <1% have integrated Truecaller. This accounts for <1% of app downloads within the user authentication SDK category.

Total Apps
688
App Store
App Share
<1%
App Store
Apps
680
Games
8
Total Downloads
942.91m
App Store
Download Share
<1%
App Store
App Downloads
937.15m
Game Downloads
5.75m

Use the 42matters SDK Explorer to find all apps that use Truecaller.

Browse iOS and Android SDKs With the SDK Explorer

Browse background top image
  • SDK IntelligenceSDK Intelligence

    See how many apps integrate specific SDKs, how many times these SDKs have been downloaded, developer details, similar SDKs, and more.

  • New Installations and Removals HistoryNew Installations and Removals History

    Analyze installation and removal trends for SDKs. Discover which apps have removed or integrated specific SDKs in a given timeframe.

  • Market Share per Google Play and Apple App Store CategoryMarket Share per Google Play and Apple App Store Category

    See which app categories or genres are most likely to use specific SDKs. Detect SDK market share per category.

Browse background bottom imageBrowse right section image

Frequently Asked Questions (FAQs)

How does 42matters collect this data?'

We’ve developed a number of machine learning algorithms that scan millions of mobile and connected TV (CTV) applications on a regular basis. In addition, we collect ground truth app performance intelligence and use this data to build statistical models that estimate the performance of apps for which we do not have ground truth data.

What SDK data does 42matters collect?'

We track over 2,300 of the most popular SDKs integrated in iOS and Android apps. We collect a variety of SDK insights (title, platform, ID, category, and developer website); performance metrics (the number of apps that have installed each SDK, installation and removal trends, and app downloads); market share statistics (including market share per app category); and more!

How can I access 42matters’ SDK data?'

The most direct way is to use our SDK Explorer, which is a visual, web-based research platform that enables you to peruse all 2,300+ SDKs that we track. It’s great for market research, lead generation, competitor analysis, etc. However, more technically-inclined folks might prefer our APIs and File Dumps, which enable you to query info for specific apps or SDKs. You can also use our other research platform (the Explorer) to view integrated SDKs by app.

Can I use 42matters’ solutions to generate app publisher leads?'

Absolutely! We actually wrote about this on our blog. We focused on ad network SDKs, but the examples are applicable to most SDK types. To summarize, you can use the Explorer’s advanced filtering capabilities to home in on best-fit app publishers, leverage the SDK Explorer to see which apps use your competitors’ SDKs, and use our APIs and file dumps to build custom lead generation processes.

What data does 42matters provide on mobile apps?'

A ton! We track 17+ million apps across Google Play, the Apple App Store, Amazon Appstore, Tencent Appstore, and Huawei AppGallery. Our solutions provide access to app details (developer insights, metadata, ASO keywords, contact information, etc.); performance metrics (downloads, MAUs, ratings, reviews, top chart rankings, etc.); technical insights (integrated SDKs, permissions, required capabilities, etc.); content details (categories, genres, IAB categories, content ratings, etc.); compliance information (app-ads.txt, privacy policies, store status, etc.) and much, much more!

Can I use 42matters’ solutions to find SDKs for my app?'

Definitely. The SDK Explorer enables you to sort SDKs by category, identify similar SDKs, analyze SDK reliability, and more. In addition, you can use the Explorer to monitor your competitors, including which SDKs they add and remove, their current tech stacks, and SDK changelogs. This means you use our solutions not only to find the right SDK for a particular purpose, but also which SDKs you might need to keep up with your rivals.