Nowadays there are plenty of apps on the market. How secure it is, that's for individual to decide. Even reputable corporations the software they selling also retrieve info from your computer and send it across internet. If you don't believe, install a Firewall device between your computer to your ISP router. On the firewall monitor system, you can see there is actually outgoing traffic to external destination even you leave you computer idle without running any application. And when you install Wireshark connecting to the firewall, you can see every few seconds there are services or application sending info to external destination even your computer is idle.