Is there a Postcrossing mobile app?

We know that the website is currently not very easy to use on mobile platforms — this is something we are improving and it is a priority for us. Making the website more mobile friendly (responsive) is taking us longer than we would like, but we are working on it. There will not be a mobile app, but we are aiming that the mobile version of the website will provide similar usability, while ensuring that the whole website functionality is always available on all mobile platforms (and not only some its features).