When comparing BillGuard vs Driller, the Slant community recommends BillGuard for most people. In the question“What are the best personal finance tracker apps for Android? ” BillGuard is ranked 15th while Driller is ranked 16th. The most important reason people chose BillGuard is:
While it may not use the lollipop design guidelines, it still has a clean, simple, elegant interface.
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Pros

Pro Nice User Interface
While it may not use the lollipop design guidelines, it still has a clean, simple, elegant interface.
Pro Strong protection against fraudulent activity
Many finance applications have this feature but BillGuard was designed to be first an applications that protects you against fraud and second finance tracker. BillGuard's data breach alert will send an alert if the application believes that a card's information has been hacked. Users can also help to report fraudulent charges to improve the service. If a gray charge is encountered, BillGuard will contact the merchant directly.
Pro Read-only access
BillGuard has a focus on privacy and security. All access to bank accounts is read only, so money can't be moved from within the application.
Pro Free and no advertisements
BillGuard is free with no advertisements. It is unclear how BillGuard makes money.
Pro All bank accounts and investments can be viewed in one place
Like a few other finance tracking applications out there BillGuard makes it convenient to make a budget and track spending by pulling in all bank accounts and investments into one convenient application.

Pro Flag or Approve all transactions
With a simple right swipe to approve or a left swipe to flag a transaction for review (a la Mailbox).
Pro Web applications
If you need to plan your budget or check on a fraudulent transaction BillGuard has you covered with a web application.
Pro Data not locked down
You can export your data out to a text file.
Pro Rapid entry of data
Autocomplete and autofill functions make it quick to enter your data and to keep it all organized.
Pro Can keep your old data
If you have old data from another source, you can import it into the app.
Pro Can convert foreign currencies based on exchange rate
Has a foreign currency exchange rate converter and the user can also define their own custom currency exchange rate. Feature is for premium users only.
Pro Has a free version
Driller has a free, ad-supported version and a full version that removed the ads can be purchased with an in-app-purchase.
Pro Very flexible data entry
You can enter your data how you like it. If you want to keep it simple you can. If you want to be detailed you can.
Pro Detailed statistics
You can drill down very deeply into your spending habits. If you want to find out how much you spend at a particular shop on a particular month for food you can do that.
Cons
Con US support only
BillGuard is "currently limited to US credit cards and debit cards only, but our goal is to protect everyone and every bill around the globe." But if you are really interested in using BillGuard in another country then you can request that the BillGuard developers prioritize your country here.
Con Somewhat basic visuals and analytics
While other applications provide especially useful charts and graphs of income and spending, BillGuard's are somewhat basic and uninformative. The visuals consist of a simple pie chart of your spending for each month or each account and a line graph that shows the current month's transactions.
