We have recently released a small improvement which will make a huge difference to our users. Now, instead of seeing no more than 100 relevant photos at a time, the app will allow you to scroll back in time. This important decision was made based on our own experience as well as on the feedback from our users -- we are listening! So, if you have some suggestions how to make the app more exciting, let us know https://www.echowaves.com/support
The open-source example project is called What I Saw.