Well, I use Fossify calendar and have no problems with it. For maps I like and use CoMaps, but the others will work well too. The map apps though use lat and long so they only put you at the block of the address but if you put GMaps WV on your phone you can put the address in it and then click share and copy the lat and long it provides and paste it into comaps and it will route straight to the address, its a couple extra steps but quick and easy. I honestly think youll realize you wish youd have switched sooner. Graphene is just amazing. Plus you can talk to them on their platforms and channels