RaspFinder will tell you the IP address of your RaspberryPi on your Wi-Fi network.
RaspFinder helps you to find your device in the case, when
•  you are not able to access your Raspberry directly
•  you can't browse your router for a connected devices list
•  you have your Raspberry at hand, but too lazy to connect it via HDMI or Ethernet
All you need to care about - that the Raspberry and your smartphone are on the same network.
Features:
✓ quick search: within 2-3 secs
✓ simple and intuitive interface
✓ does not include advertising
✓ low application weight
✓ decent and/or modern design