NHS Direct, Ranky, Hound and more

NHS Direct has worked with developer Mobikats to make an official Android app, which helps people look up their symptoms and decide whether they can treat themselves, or need to see a doctor. It includes all 37 of NHS Direct's online symptom checkers, and can generate a call-back from an NHS Direct nurse advisor. An iPhone version is coming in June.

SoundHound made its name with Shazam-style music identification apps, however its new spin-off is slightly different. Hound uses voice search, getting users to speak an artist name to bring up a page of information, song previews and lyrics. It's available for iOS and Android, and during music-focused for now, is part of SoundHound's move into more general voice search for other forms of entertainment.

The Daily Express has gone to Android with its official Puzzles app, developed by Wired Productions working with the newspaper's publisher. The app includes more than 1,200 crosswords, word searches, sudoku and other puzzles.

Online dating service FriendFinder has launched its official Android app, aimed at helping its 50 million members access the service on the move.

iPhone owners heading to the Venice Biennale art event will find Christie's' new app an essential download. It includes directions to the key venues, a calendar of events, tips from art experts and info on the city's nightlife.

iPhone and Android app ooVoo Mobile is a free social app that offers video chat for up to six people straightway, along with instant messaging and VoIP (Voice over Internet Protocol).

Client app for the service of the same name

Android app Noispot is a client app for the service of the same name, which focuses on "interactive background music". That means walking into cafes, bars and restaurants whose music is powered by Noispot, and being able to vote on the songs that are playing. It's in beta.