Start enjoying access to sync across devices.  This pro feature allow you to access your account on all your devices.  
To sync your iPhone with the web, just sign up for an Hours account from either your iPhone or the web, then go to the other one and log in using the same account information.

If you already have an Hours account on the web…
Go to Hours on your iPhone, tap gear > Get a free hours account or sign in > Already have an account? > enter account information > Sign in.

To get an account on the web first… 
Go to hourstimetracking.com and click the "Sign up" button at the top of the screen, then complete the simple form to register your Hours account.

 

Once you are signed up, go to Hours on your iPhone, tap gear > Get a free hours account or sign in > Already have an account? > enter account information > Sign in.

To get an account on your iPhone first…
Open Hours on your iPhone, tap the gear button from the main Hours screen, then tap the "Get a free Hours account" button, then complete the simple form to register your Hours account.

  

Once you are signed up, go to hourstimetracking.com and click on "Sign in" at the top of the screen to sign in to your account on the web. The data on your iPhone and on the web will then be in sync.

As long as you stay signed in on your iPhone and you have a data connection, your data will be synced between your iPhone and the web. If you sign out or lose your data connection, your data will get back in sync when you reconnect.