Then & Now is a Camera app that adds the ability to have the "Then" photo in the Camera View. I recommend using "PhotoScan" by Google to get the "Then" image. After you get the "Then" image, you have a greater ability to match the "Now" pose to the "Then" image by using the transparency slide bar to get the best possible "Now" photo you can get: -).
It's safe to download this application. SoBo Apps is the creator of the app which is included in the Photography category. The most recent update of the tool was launched on Jan 10, 2017 and Then & Now was downloaded by over 10 users.
On Google Play, this application was rated 4.5 by its users. Get the installation package of Then & Now 1.36.4 that is available for free and have a look at users' reviews on Droid Informer. The app is built for Android 4.0.3 and higher.