Utter garbage, went through the long sign up process only to have it not be able to "retrieve my account preferences". Had to send a verification email 3 times for some reason. And the online portion of the app is glitchy and can show an symbols they all show up as 
Not as helpful as it should be. App tells you how much electric range you have in your Chevy Volt's batteries and how much gasoline range you have in your Volt's gas tank, but not the number of gallons in the tank. The method of getting the app to extract the information from the car is not intuitive so there will be lots of calls for tech support from new Volt owners. The OnStar app gives you the number of gallons in the tank, but I was told by a tech support person that the OnStar app was old and no longer supported. Neither app gives the miles per gallon when using gasoline. That is automatically given for ordinary cars, but you have to calculate it by hand with a plug in hybrid like my Volt. The app should detect that it is talking to a plug in hybrid and automatically give both the lifetime miles per gallon using the total mileage as the numerator and the lifetime miles per gallon using the miles driven on gasoline engine power as the numerator. Both apps overestimate the range available with battery and with gasoline backup by about ten percent. Anyone using these apps to estimate available range should subtract ten percent from the numbers to get a reliable estimate.
Every time I enter my password it Just repeats the same instructions, to enter the password again. Also it does show the cars current location itself. Waste of time and memory to get it
One thing that needs to be added is fingerprint option instead of a pin code. Be much easier rather than fumbling with a code. Edit: Thanks for listening!
Convenient features but app is out of sync with the car. I know the correct information is getting to OnStar because I received my email that my Volt was finished charging but the app still says I only have 29% charge. 10 hours later and dozens of refreshes and it still says 29% and charging. Makes me less than confident that the anti-theft features will work if/when needed. UPDATE: You need to complete an action that requires authentication in order to refresh car info (tire pressure, charge status, etc...). There is no indication that this is required but you can go over 24 hours without the ability to refresh (pulling down on the page does nothing and gives no error) until you enter PIN or fingerprint. Typical software developed by a multi-billion dollar corporation with no real testing. If this was the quality of my work I would be unemployed.
App use to be good. Long lag time when unlocking doors. Also got a message wanting to know if I still owned the vehicle.
Bug fixes & minor enhancements
Resolved crash issue
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