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Top 20 User Authentication SDKs Used in iOS Apps on the Apple App Store
Last update: 16 Oct 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, 49.04% have integrated AppAuth by OpenID. This accounts for 51.01% 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
216.80k
App Store
App Share
49.04%
App Store
Apps
210.24k
Games
6.56k
Total Downloads
113.28b
App Store
Download Share
51.01%
App Store
App Downloads
103.01b
Game Downloads
10.27b

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

Among all apps utilizing user authentication SDKs, 43.65% have integrated Firebase Authentication. This accounts for 21.25% of app downloads within the user authentication SDK category.

Total Apps
193.00k
App Store
App Share
43.65%
App Store
Apps
181.41k
Games
11.59k
Total Downloads
47.20b
App Store
Download Share
21.25%
App Store
App Downloads
35.49b
Game Downloads
11.71b

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

Among all apps utilizing user authentication SDKs, 33.13% have integrated Apple Accounts. This accounts for 32.71% of app downloads within the user authentication SDK category.

Total Apps
146.48k
App Store
App Share
33.13%
App Store
Apps
119.00k
Games
27.47k
Total Downloads
72.65b
App Store
Download Share
32.71%
App Store
App Downloads
50.66b
Game Downloads
21.98b

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

Among all apps utilizing user authentication SDKs, 18.24% have integrated Google reCAPTCHA. This accounts for 13.74% of app downloads within the user authentication SDK category.

Total Apps
80.66k
App Store
App Share
18.24%
App Store
Apps
77.63k
Games
3.04k
Total Downloads
30.52b
App Store
Download Share
13.74%
App Store
App Downloads
23.56b
Game Downloads
6.96b

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

Among all apps utilizing user authentication SDKs, 2.85% have integrated Amazon AWS Cognito Federated Identities. This accounts for 4.21% of app downloads within the user authentication SDK category.

Total Apps
12.61k
App Store
App Share
2.85%
App Store
Apps
12.21k
Games
403
Total Downloads
9.36b
App Store
Download Share
4.21%
App Store
App Downloads
6.85b
Game Downloads
2.51b

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

Among all apps utilizing user authentication SDKs, 1.32% have integrated Microsoft Authentication Library. This accounts for 2.31% of app downloads within the user authentication SDK category.

Total Apps
5.85k
App Store
App Share
1.32%
App Store
Apps
5.84k
Games
11
Total Downloads
5.13b
App Store
Download Share
2.31%
App Store
App Downloads
5.13b
Game Downloads
2.50m

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

Among all apps utilizing user authentication SDKs, 1.17% have integrated Mitek MiSnap. This accounts for 1.97% 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
5.16k
App Store
App Share
1.17%
App Store
Apps
5.16k
Games
0
Total Downloads
4.37b
App Store
Download Share
1.97%
App Store
App Downloads
4.37b
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 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
4.41k
App Store
App Share
<1%
App Store
Apps
4.40k
Games
6
Total Downloads
1.39b
App Store
Download Share
<1%
App Store
App Downloads
1.38b
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 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
4.11k
App Store
App Share
<1%
App Store
Apps
4.11k
Games
8
Total Downloads
642.52m
App Store
Download Share
<1%
App Store
App Downloads
632.72m
Game Downloads
9.80m

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 1.07% 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
3.55k
App Store
App Share
<1%
App Store
Apps
3.36k
Games
195
Total Downloads
2.37b
App Store
Download Share
1.07%
App Store
App Downloads
2.10b
Game Downloads
275.05m

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
2.40k
App Store
App Share
<1%
App Store
Apps
2.38k
Games
17
Total Downloads
4.88b
App Store
Download Share
2.20%
App Store
App Downloads
4.88b
Game Downloads
1.86m

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
1.86k
App Store
App Share
<1%
App Store
Apps
1.86k
Games
5
Total Downloads
448.42m
App Store
Download Share
<1%
App Store
App Downloads
444.07m
Game Downloads
4.35m

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

Among all apps utilizing user authentication SDKs, <1% have integrated FingerprintJS. This accounts for 1.54% of app downloads within the user authentication SDK category.

Total Apps
1.23k
App Store
App Share
<1%
App Store
Apps
1.17k
Games
53
Total Downloads
3.42b
App Store
Download Share
1.54%
App Store
App Downloads
3.13b
Game Downloads
281.65m

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

Among all apps utilizing user authentication SDKs, <1% have integrated Kount by Equifax. This accounts for 1.07% of app downloads within the user authentication SDK category.

Total Apps
1.22k
App Store
App Share
<1%
App Store
Apps
1.21k
Games
5
Total Downloads
2.38b
App Store
Download Share
1.07%
App Store
App Downloads
2.38b
Game Downloads
161.53k

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
1.12k
App Store
App Share
<1%
App Store
Apps
1.07k
Games
48
Total Downloads
892.53m
App Store
Download Share
<1%
App Store
App Downloads
717.34m
Game Downloads
175.19m

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
942
App Store
App Share
<1%
App Store
Apps
941
Games
1
Total Downloads
392.11m
App Store
Download Share
<1%
App Store
App Downloads
392.10m
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 3.05% of app downloads within the user authentication SDK category.

Total Apps
862
App Store
App Share
<1%
App Store
Apps
857
Games
5
Total Downloads
6.78b
App Store
Download Share
3.05%
App Store
App Downloads
6.77b
Game Downloads
15.58m

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
787
App Store
App Share
<1%
App Store
Apps
780
Games
7
Total Downloads
1.62b
App Store
Download Share
<1%
App Store
App Downloads
1.62b
Game Downloads
1.43m

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 1.24% 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
744
App Store
App Share
<1%
App Store
Apps
722
Games
22
Total Downloads
2.74b
App Store
Download Share
1.24%
App Store
App Downloads
2.73b
Game Downloads
18.92m

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
693
App Store
App Share
<1%
App Store
Apps
685
Games
8
Total Downloads
956.15m
App Store
Download Share
<1%
App Store
App Downloads
950.87m
Game Downloads
5.28m

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.