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Top 20 User Authentication SDKs Used in iOS Apps on the Apple App Store
Last update: 24 Jul 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, 47.67% 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
206.64k
App Store
App Share
47.67%
App Store
Apps
200.52k
Games
6.12k
Total Downloads
106.76b
App Store
Download Share
50.32%
App Store
App Downloads
98.57b
Game Downloads
8.20b

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

Among all apps utilizing user authentication SDKs, 42.36% have integrated Firebase Authentication. This accounts for 21.17% of app downloads within the user authentication SDK category.

Total Apps
183.59k
App Store
App Share
42.36%
App Store
Apps
172.47k
Games
11.13k
Total Downloads
44.92b
App Store
Download Share
21.17%
App Store
App Downloads
33.58b
Game Downloads
11.34b

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

Among all apps utilizing user authentication SDKs, 36.24% have integrated Apple Accounts. This accounts for 32.82% of app downloads within the user authentication SDK category.

Total Apps
157.09k
App Store
App Share
36.24%
App Store
Apps
127.95k
Games
29.14k
Total Downloads
69.63b
App Store
Download Share
32.82%
App Store
App Downloads
50.20b
Game Downloads
19.42b

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

Among all apps utilizing user authentication SDKs, 15.69% have integrated Google reCAPTCHA. This accounts for 13.79% of app downloads within the user authentication SDK category.

Total Apps
68.00k
App Store
App Share
15.69%
App Store
Apps
65.20k
Games
2.80k
Total Downloads
29.25b
App Store
Download Share
13.79%
App Store
App Downloads
22.56b
Game Downloads
6.69b

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

Among all apps utilizing user authentication SDKs, 3.07% have integrated Amazon AWS Cognito Federated Identities. This accounts for 4.17% of app downloads within the user authentication SDK category.

Total Apps
13.31k
App Store
App Share
3.07%
App Store
Apps
12.91k
Games
400
Total Downloads
8.86b
App Store
Download Share
4.17%
App Store
App Downloads
6.71b
Game Downloads
2.14b

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

Among all apps utilizing user authentication SDKs, 1.26% have integrated Microsoft Authentication Library. This accounts for 2.39% of app downloads within the user authentication SDK category.

Total Apps
5.45k
App Store
App Share
1.26%
App Store
Apps
5.44k
Games
12
Total Downloads
5.07b
App Store
Download Share
2.39%
App Store
App Downloads
5.07b
Game Downloads
2.51m

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

Among all apps utilizing user authentication SDKs, 1.20% have integrated Mitek MiSnap. This accounts for 2.08% 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
5.20k
App Store
App Share
1.20%
App Store
Apps
5.20k
Games
0
Total Downloads
4.42b
App Store
Download Share
2.08%
App Store
App Downloads
4.42b
Game Downloads
343

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

Among all apps utilizing user authentication SDKs, 1.04% 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
4.51k
App Store
App Share
1.04%
App Store
Apps
4.50k
Games
6
Total Downloads
682.72m
App Store
Download Share
<1%
App Store
App Downloads
673.10m
Game Downloads
9.62m

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
3.96k
App Store
App Share
<1%
App Store
Apps
3.96k
Games
4
Total Downloads
1.25b
App Store
Download Share
<1%
App Store
App Downloads
1.24b
Game Downloads
11.49m

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 1.05% 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
3.68k
App Store
App Share
<1%
App Store
Apps
3.50k
Games
174
Total Downloads
2.23b
App Store
Download Share
1.05%
App Store
App Downloads
2.06b
Game Downloads
170.09m

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 2.35% of app downloads within the user authentication SDK category.

Total Apps
2.43k
App Store
App Share
<1%
App Store
Apps
2.41k
Games
17
Total Downloads
4.99b
App Store
Download Share
2.35%
App Store
App Downloads
4.99b
Game Downloads
3.04m

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
1.89k
App Store
App Share
<1%
App Store
Apps
1.89k
Games
6
Total Downloads
427.20m
App Store
Download Share
<1%
App Store
App Downloads
422.83m
Game Downloads
4.37m

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 1.10% of app downloads within the user authentication SDK category.

Total Apps
1.12k
App Store
App Share
<1%
App Store
Apps
1.12k
Games
5
Total Downloads
2.33b
App Store
Download Share
1.10%
App Store
App Downloads
2.33b
Game Downloads
58.42k

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
1.04k
App Store
App Share
<1%
App Store
Apps
997
Games
46
Total Downloads
849.57m
App Store
Download Share
<1%
App Store
App Downloads
671.04m
Game Downloads
178.53m

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

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
1.01k
App Store
App Share
<1%
App Store
Apps
1.01k
Games
1
Total Downloads
386.14m
App Store
Download Share
<1%
App Store
App Downloads
386.13m
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 FingerprintJS. This accounts for 1.41% of app downloads within the user authentication SDK category.

Total Apps
848
App Store
App Share
<1%
App Store
Apps
807
Games
41
Total Downloads
2.99b
App Store
Download Share
1.41%
App Store
App Downloads
2.72b
Game Downloads
266.59m

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

Among all apps utilizing user authentication SDKs, <1% have integrated Facetec. This accounts for 2.68% of app downloads within the user authentication SDK category.

Total Apps
819
App Store
App Share
<1%
App Store
Apps
814
Games
5
Total Downloads
5.69b
App Store
Download Share
2.68%
App Store
App Downloads
5.68b
Game Downloads
13.10m

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

Among all apps utilizing user authentication SDKs, <1% have integrated Onfido Capture. This accounts for 1.22% 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
748
App Store
App Share
<1%
App Store
Apps
725
Games
23
Total Downloads
2.60b
App Store
Download Share
1.22%
App Store
App Downloads
2.56b
Game Downloads
32.76m

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

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
727
App Store
App Share
<1%
App Store
Apps
720
Games
7
Total Downloads
1.52b
App Store
Download Share
<1%
App Store
App Downloads
1.52b
Game Downloads
1.15m

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

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
696
App Store
App Share
<1%
App Store
Apps
686
Games
10
Total Downloads
907.58m
App Store
Download Share
<1%
App Store
App Downloads
874.46m
Game Downloads
33.12m

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

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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.