Below are the schedule when the apps turned free. Each of them cost $5.99 usd. It will be worthwhile if you do travel a lot. For Android users, all tripwolf guides are also available in the Android Market
Thursday December 1st
Italy, Amsterdam, Istanbul, Cologne, Linz
Friday December 2nd
London, Florence, Copenhagen, Oslo, Leipzig
Saturday December 3rd
New York City, Lisbon, Dublin, Dresden, Saint Petersburg
Sunday December 4th
Austria, Mailand, Frankfurt am Main, Valencia, Bordeaux
Monday December 5th
Paris, Stockholm, Porto, Turin, Stuttgart
Tuesday December 6th
Venice, Sevilla, Nice, Glasgow, Düsseldorf
Wednesday December 7th
Vienna, Hamburg, Brussels, Palma de Mallorca, Genoa
Thursday December 8th
Barcelona, Edinburgh, Bologna, Marseille, Heidelberg
Friday December 9th
Bangkok, Los Angeles, Melbourne, Chicago, Dubrovnik
Saturday December 10th
Budapest, San Francisco, Hongkong, Singapore, Rio de Janeiro
Sunday December 11th
Prague, Vancouver, Sydney, Cape Town, Delhi
Monday December 12th
Las Vegas, Buenos Aires, Athens, Tokyo, Cairo
Tuesday December 13th
Shanghai, Hanoi, Dubai, Beijing