Frugal Pro is the advanced version of Frugal Flyer. View full offers from each airline and flight search sites including Google Flights. Enter your info once and see full offers from all. Frugal shows full offers from each airline not a sorted list of flights by price- but the full offers from each airline in its own separate window.
It's secure to download the app. Webport.com is the developer of Frugal Pro that relates to the Travel & Local category. Google Play displays that the tool is rated 3.3 by its users.