Doubleappiness.com was scripted in 2012-13 as a response to the lack of tools to aid smartphone users switch platforms. Users lost their texts and often their contacts when moving from an Android phone to an iPhone, and repopulating their app collection was such a pain that few people made the move. The web back-end uses eight matching criteria — including eigenimage image recognition analysis of the app logo — to establish whether an app is available on both operating systems. If not, it uses a Sphinx-based recommendation engine and Bayesian ranking to pick the best match available. Users can download a helper app — appmigrate  — to export their contacts and texts from their Android, and another  — archiveSMS  — to archive their old texts on their new iPhone.

Proving that timing is critical, after the site and apps launched, the anticipated iPhone 5 proved to be a lukewarm success, with few users migrating from Android.

The automatically-updating multi-million-page dynamic-content site is now very dated and a bit long in the tooth. It is currently un-supported and is due to be deleted.