Gabe Weatherhead at *Macdrifter* links to Amazon’s [Whispersync for Voice](http://www.amazon.com/gp/feature.html/ref=kics_hp_dp_lm?ie=UTF8&docId=1000827761) and says “If it works, it’s an unbeatable combination that I will pay more for.” I have been using Whispersync for Voice for a week or two now and it has been working quite well for me.
It took me a little to figure out the steps to get syncing to work, but the key is to **hit the “Refresh” button in the “My Library” section of the Audible App** after you have read on your Kindle or in a Kindle app[^fn1]. This refresh is how the audio gets synced to where you finished your reading.
Amazon [has a list of free books](http://www.amazon.com/s/ref=amb_link_364864422_2?ie=UTF8&node=5744839011&pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-4&pf_rd_r=02389BEVQG3CS2FJT745&pf_rd_t=1401&pf_rd_p=1395819702&pf_rd_i=1000827761) you can use to see if Whispersync for Voice will work for you.
[^fn1]: I have synced between my Kindle device, Kindle for iOS, and the Audible app on my iPhone. I have not tried to sync audio-to-audio across two different instances of the Audible app on two different iOS devices