Truecaller
Its primary SDK category is User Authentication and it's used by iOS apps.
Looking at download trends over the last month, the most popular 
iOS apps that use Truecaller are:
Using this information, it appears that Truecaller is Somewhat Popular among iOS app developers.
Moreover, over the last 30 days, Truecaller has been…
- Installed on 70 iOS apps.
- Deleted from 10 iOS apps.
It's especially popular among iOS apps in the following genres: Education and Sports.
SDKs that are similar to Truecaller:
- Signpost in the User Authentication category
- SumSub in the User Authentication category
- Unify Id in the User Authentication category
- OAuthSwift in the User Authentication category
- AppAuth by OpenID in the User Authentication category
- BlockID by 1Kosmos in the User Authentication category
- Facetec in the User Authentication category
- idwall Onboarding in the User Authentication category
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