TrueHDR is described as 'Use TrueHDR to create beautiful HDR (high dynamic range) photos on your iPhone 4, iPhone 3GS, and iPod Touch. With TrueHDR, you can get the best of both worlds - capturing the details of bright and dark areas and then merging them into a single photo' and is an app in the Photos & Graphics category. There are three alternatives to TrueHDR for iPhone. The best alternative is Halide. Other great apps like TrueHDR are Manual (Paid) and Focus Manual Camera (Paid).
Halide is a high-end camera app for photographers. Use gestures to change exposure and manual focus. Customize controls to adapt the app to your needs. Halide’s professional tools include focus peaking, a detailed histogram, adaptive level grid, and RAW support.
Manual is a powerful camera app that gives you full control of your photos by letting you customize shutter, exposure and more. Full independent control of • Shutter • ISO • White Balance • Focus • Exposure Compensation