Three20
Three20 is a collection of iPhone UI classes, like a photo viewer, and general utilities, like an HTTP disk cache.
Its primary SDK category is Developer Tools and it's used by iOS apps.
Looking at download trends over the last month, the most popular 
iOS apps that use Three20 are:
Using this information, it appears that Three20 is Not Popular among iOS app developers.
Moreover, over the last 30 days, Three20 has been…
- Installed on 2 iOS apps.
- Deleted from 7 iOS apps.
It's especially popular among iOS apps in the following genres: Social Networking and Music.
SDKs that are similar to Three20:
- JRSwizzle in the Developer Tools category
- JSQMessagesViewController in the Developer Tools category
- Kanna in the Developer Tools category
- NumbusKit in the Developer Tools category
- Objection in the Developer Tools category
- SwiftDate in the Developer Tools category
- TITokenField in the Developer Tools category
- TSMessages in the Developer Tools category
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