I'm always on the lookout for innovative photography apps and vividHDR certainly qualifies. It's a universal app that sells for US $1.99. Unlike many apps that take 2 exposures for HDR (High Dynamic Range imaging), vividHDR takes 3. It shows you a split screen of the normally exposed image, alongside the HDR tone-mapped photo. Unlike some apps that can give you 'overcooked' results, you can get natural looking photos from this app, with better shadow detail and more realistic colors.
The app offers settings for Natural, Lively and Dramatic photos. Saturation and contrast increase with each step away from Natural. You can also select 'custom', and process the images any of the 3 ways before you save them.
The app