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Top 20 User Authentication SDKs Used in iOS Apps on the Apple App Store
Last update: 7 May 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, 46.23% have integrated AppAuth by OpenID. This accounts for 50.32% 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
196.43k
App Store
App Share
46.23%
App Store
Apps
190.52k
Games
5.91k
Total Downloads
102.51b
App Store
Download Share
50.32%
App Store
App Downloads
93.46b
Game Downloads
9.05b

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

Among all apps utilizing user authentication SDKs, 40.57% have integrated Firebase Authentication. This accounts for 20.62% of app downloads within the user authentication SDK category.

Total Apps
172.42k
App Store
App Share
40.57%
App Store
Apps
161.78k
Games
10.64k
Total Downloads
42.02b
App Store
Download Share
20.62%
App Store
App Downloads
31.55b
Game Downloads
10.47b

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

Among all apps utilizing user authentication SDKs, 40.12% have integrated Apple Accounts. This accounts for 35.31% of app downloads within the user authentication SDK category.

Total Apps
170.50k
App Store
App Share
40.12%
App Store
Apps
139.16k
Games
31.35k
Total Downloads
71.94b
App Store
Download Share
35.31%
App Store
App Downloads
49.87b
Game Downloads
22.07b

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

Among all apps utilizing user authentication SDKs, 12.64% have integrated Google reCAPTCHA. This accounts for 9.97% of app downloads within the user authentication SDK category.

Total Apps
53.71k
App Store
App Share
12.64%
App Store
Apps
51.21k
Games
2.51k
Total Downloads
20.31b
App Store
Download Share
9.97%
App Store
App Downloads
14.13b
Game Downloads
6.18b

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

Among all apps utilizing user authentication SDKs, 3.24% have integrated Amazon AWS Cognito Federated Identities. This accounts for 3.00% of app downloads within the user authentication SDK category.

Total Apps
13.76k
App Store
App Share
3.24%
App Store
Apps
13.37k
Games
398
Total Downloads
6.10b
App Store
Download Share
3.00%
App Store
App Downloads
4.12b
Game Downloads
1.98b

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

Among all apps utilizing user authentication SDKs, 1.24% have integrated Mitek MiSnap. This accounts for 2.07% 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
5.25k
App Store
App Share
1.24%
App Store
Apps
5.25k
Games
0
Total Downloads
4.23b
App Store
Download Share
2.07%
App Store
App Downloads
4.23b
Game Downloads
343

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

Among all apps utilizing user authentication SDKs, 1.13% have integrated Microsoft Authentication Library. This accounts for 2.33% of app downloads within the user authentication SDK category.

Total Apps
4.79k
App Store
App Share
1.13%
App Store
Apps
4.78k
Games
13
Total Downloads
4.74b
App Store
Download Share
2.33%
App Store
App Downloads
4.74b
Game Downloads
2.78m

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

Among all apps utilizing user authentication SDKs, 1.11% 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
4.73k
App Store
App Share
1.11%
App Store
Apps
4.72k
Games
6
Total Downloads
591.62m
App Store
Download Share
<1%
App Store
App Downloads
558.83m
Game Downloads
32.79m

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

Among all apps utilizing user authentication SDKs, <1% have integrated FCUUID. This accounts for 1.14% 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
3.91k
App Store
App Share
<1%
App Store
Apps
3.72k
Games
191
Total Downloads
2.33b
App Store
Download Share
1.14%
App Store
App Downloads
2.07b
Game Downloads
255.95m

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

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
3.40k
App Store
App Share
<1%
App Store
Apps
3.39k
Games
8
Total Downloads
967.21m
App Store
Download Share
<1%
App Store
App Downloads
962.80m
Game Downloads
4.41m

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

Among all apps utilizing user authentication SDKs, <1% have integrated FraudForce by iovation. This accounts for 2.35% of app downloads within the user authentication SDK category.

Total Apps
2.41k
App Store
App Share
<1%
App Store
Apps
2.40k
Games
15
Total Downloads
4.79b
App Store
Download Share
2.35%
App Store
App Downloads
4.79b
Game Downloads
2.89m

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
1.95k
App Store
App Share
<1%
App Store
Apps
1.95k
Games
6
Total Downloads
428.23m
App Store
Download Share
<1%
App Store
App Downloads
421.98m
Game Downloads
6.26m

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% of app downloads within the user authentication SDK category.

Total Apps
1.06k
App Store
App Share
<1%
App Store
Apps
1.06k
Games
6
Total Downloads
815.86m
App Store
Download Share
<1%
App Store
App Downloads
815.73m
Game Downloads
127.25k

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

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
1.04k
App Store
App Share
<1%
App Store
Apps
1.04k
Games
1
Total Downloads
259.81m
App Store
Download Share
<1%
App Store
App Downloads
259.80m
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 SumSub. This accounts for <1% of app downloads within the user authentication SDK category.

Total Apps
954
App Store
App Share
<1%
App Store
Apps
911
Games
43
Total Downloads
839.97m
App Store
Download Share
<1%
App Store
App Downloads
665.83m
Game Downloads
174.13m

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

Among all apps utilizing user authentication SDKs, <1% have integrated Onfido Capture. This accounts for 1.20% 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
751
App Store
App Share
<1%
App Store
Apps
729
Games
22
Total Downloads
2.45b
App Store
Download Share
1.20%
App Store
App Downloads
2.42b
Game Downloads
28.72m

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

Among all apps utilizing user authentication SDKs, <1% have integrated Facetec. This accounts for 2.59% of app downloads within the user authentication SDK category.

Total Apps
745
App Store
App Share
<1%
App Store
Apps
740
Games
5
Total Downloads
5.27b
App Store
Download Share
2.59%
App Store
App Downloads
5.26b
Game Downloads
10.57m

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

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
692
App Store
App Share
<1%
App Store
Apps
682
Games
10
Total Downloads
835.34m
App Store
Download Share
<1%
App Store
App Downloads
818.39m
Game Downloads
16.95m

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

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
654
App Store
App Share
<1%
App Store
Apps
649
Games
5
Total Downloads
1.64b
App Store
Download Share
<1%
App Store
App Downloads
1.64b
Game Downloads
887.36k

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

Among all apps utilizing user authentication SDKs, <1% have integrated FingerprintJS. This accounts for 1.32% of app downloads within the user authentication SDK category.

Total Apps
639
App Store
App Share
<1%
App Store
Apps
604
Games
35
Total Downloads
2.69b
App Store
Download Share
1.32%
App Store
App Downloads
2.45b
Game Downloads
237.37m

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

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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.