Features
Progress saver / video tutorialsLanguages
-Platforms
-Number of languages
-In-app purchases
-Ads
-User generated
-Features
Forum, video tutorials, written tutorials, projectsLanguages
Computer languages, Mandarin Chinese, Spanish, Italian, Japanese, English, Russian, FrenchPlatforms
-Number of languages
-In-app purchases
-Ads
-User generated
-Features
-Languages
-Platforms
iOS, Android, Windows phone, WebNumber of languages
~30 from EnglishIn-app purchases
YesAds
Yes (Android, iOS)User generated
Partially (incubator)Features
Video tutorials, tests, forumLanguages
English, Spanish, Chinese, KoreanPlatforms
-Number of languages
-In-app purchases
-Ads
-User generated
-Features
Video tutorials / written tutorials / progress saver / editor / projectsLanguages
Ruby / JavaScript / PHPPlatforms
-Number of languages
-In-app purchases
-Ads
-User generated
-