Just two months after its last major update, iOS web browser Dolphin has been upgraded to version 4.0. The new version of the app adds a voice control feature called Dolphin Sonar, which compliments the existing gesture controls by letting you search the web and manage your browsing experience using your voice. However, while the app itself remains free to download, Sonar is only available as a $0.99 in-app purchase. Other changes include the return of the URL keyboard (though you can still switch back to default) and the ability to pick between Google, Yahoo, Bing, and Wikipedia as your default search engine. There's also a new night mode that lets you easily dim the screen, and when you save images they'll now go directly to your photo album. As per usual there are also unspecified stability and performance fixes, and you can get the app for free from the source link below.