Safari’s content blockers effectively block trackers and other Bad Stuff on the web, but that only works in Apple’s browser. Any other app you install on your iPhone or iPad can send all kinds of personal information to anyone, without you ever knowing. Your location, the details of your menstrual cycle, how long you spend asleep — pretty much anything.

So how do you stop this? Well, iOS 13 itself can help limit some abuses. But what you really need is an iOS firewall app that can detect and shut down any unauthorized connections.

This week we block pesky privacy-invading trackers with Guardian Firewall, make sweet (weird) melodies with Ioniarics, and discover the next best thing to the keytar with Roxsyn.

Lockdown Apps is a new firewall app for iOS. Like Guardian Firewall, which we covered last month, Lockdown uses iOS’ VPN framework to intercept all incoming and outgoing network traffic, and allows you to block connections to any address.

Unlike Guardian Firewall, Lockdown operates entirely on your device. It is also open source.

This week, we make our music more magical with FabFilters on iOS, edit multiple streams of 4K video with Lumafusion 2, stay private with Guardian Firewall, and ridicule Microsoft’s Office to-do app, which has finally been released on the Mac.

Guardian Firewall claims to be the first proper firewall app for iOS. It works by routing all the network connections from your iPhone or iPad through a VPN, and then filtering out privacy-invading trackers on Guardian’s own servers.

The idea is that all the heavy lifting is done on those servers, so you don’t have to worry about battery drain, or on the iOS security features that prevent an app from futzing with your internet connection.

Sounds good, but should you trust Guardian Firewall?