Castle
Its primary SDK category is Security and Privacy and it's used by iOS apps.
Looking at download trends over the last month, the most popular 
iOS apps that use Castle are:
Using this information, it appears that Castle is Not Popular among iOS app developers.
Moreover, over the last 30 days, Castle has been…
- Installed on 2 iOS apps.
- Deleted from 6 iOS apps.
It's especially popular among iOS apps in the following genres: Finance and Developer Tools.
SDKs that are similar to Castle:
- Acuant Identity in the Security and Privacy category
- FraudForce by iovation in the Security and Privacy category
- IBM Trusteer Mobile SDK in the Security and Privacy category
- Confiant in the Security and Privacy category
- Google Mobile Ads Consent AdMob SDK in the Security and Privacy category
- OpenPGP in the Security and Privacy category
- Mangopay in the Payments and Commerce category
- ACRCloud in the Security and Privacy category
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Market Share per Google Play and Apple App Store Category
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