Manilla announced today that it has topped the 500,000 mark in terms of activated users. This figure represents a doubling of the bill management company’s user base in the last six months.

Since launching their Custom Accounts feature in December 2012, bill-management service Manilla has seen users add more than 54,000 local small business accounts to their network.

The expanded network means that Manilla customers are accessing a growing number of small and local businesses, thereby extending the service beyond the company’s current biller library of more than 3,500 national and regional businesses.

Manilla’s Custom Accounts feature allows users to add and manage future payments, from babysitter and lawn-care services to paying the rent. The feature also allows users to set up reminders for other upcoming obligations, such as tax filing or contributing to charity.

Android app users can use the Custom Account features immediately. Forthcoming updates from Manilla will enable iOS app customers to take advantage of the Custom Account functionality as well.

Manilla’s announcement comes in the wake of a recent survey of the company’s users. More than 65% said that they find it easier to access their financial service provider’s website through Manilla. More on Manilla’s survey is available here.

Manilla was last on the Finovate stage in September 2012 for FinovateFall. Watch their product demo here.

Last week online organization platform, Manilla, notified me that I can now create custom accounts for services that do not support online payment systems such as rent, babysitters, gym memberships and dog walkers (see email below).

To get started, log into the Manilla accounts dashboard and select create a custom account.

After selecting the account type and assigning it a name, enter due date, amount due, and frequency. Just like with Manilla’s traditional accounts, users may also create email and SMS reminders.

Once saved, the new account appears alongside the others.

New York-based Manilla stated users have requested this for quite some time now, so it is rolling out the feature in time to help consumers organize for the new year.

To learn more about Manilla, watch its FinovateFall 2012 demo.