EVA works entirely standalone - all you need is an account with Frontier.

If you are playing Elite:Dangerous on a PC or Mac, you can help EVA out by installing EDProxy by westokyo . This is a free tool which broadcasts your current location to anything that's listening on your local network. EVA uses this information to get updates on your location much more quickly than it can by asking Frontier's servers. It can be very helpful if you are doing many system to system jumps in a row, because the information received from Frontier can be out of date and can skip some systems.

EVA is able to send your travel logs to EDSM (the Elite:Dangerous Star Map), and prices to EDDB (Elite:Dangerous Database), so you don't need separate tools to do these jobs.