When comparing BillGuard vs SmartAmount, the Slant community recommends BillGuard for most people. In the question“What are the best personal finance tracker apps for Android? ” BillGuard is ranked 13th while SmartAmount is ranked 17th. 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 Original
SmartAmount has interesting original features, like future fund prediction.

Pro Simple
Unlike other money focused apps, this one is very simple to use and can be learned in few minutes.

Pro Requires only a small bit of time
Users can initially add all recurring incomes and expenses to have a rough estimate. If users forget to register occurrences for long period of time, that is not an issue as all that needs done is for the user to set their current amount and the app will adapt all of its charts and statistics.

Pro Secure
All data is encrypted, and there is a built in user set password.

Pro World-wide availability and currency support
App is available in all world countries, and supports all world currencies.

Pro Chart to see your FUTURE balance
You can easily see how next expenses change your future money availability. You can see it graphically (by chart), or through calendar view

Pro Backup and restore
You can backup in text format (JSON) so you really OWN your data, and you can read it directly from file, if needed
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.
Con Unstable
App last updated January 2017, which is causing issues with Google Play Services repeatedly crashing.
