Find "kantors" easily
The other neat thing about this app is – if you tap the binoculars icon in the top-right corner of the screen, the app displays a list of kantors near you, with full contact details including a link to their website (where you can see their exchange rates) if they have one, but you can always call them on the phone with a tap on the phone icon next to their name. Check the first screenshot above.
Note: If you just need the exchange rates, without the kantor listings, I made a lightweight version of the app here.
Most kantors have websites displaying their current exchange rates for differnt currencies – you can visit them directly by simply tapping the icon next to the kantor you're interested in. On the websites you will probably see the phrase "ceny hurtowe" (or "hurt") – this means "wholesale rates", i.e. when you are exchanging the equivalent of USD 1000 or more. The wholesale rate is a little higher – for example you get PLN 0.02 per dollar more than the "retail" rate.
Map and directions
FX Warsaw seamlessly integrates Google Maps, so you can find your way to the best deals.