Installing
Three taps
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Open the file
Android asks whether to allow installs from your browser. Allow it, and you land back on the install screen.
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Install anyway
Play Protect may say it does not recognise the app. It shows this for apps it has not yet seen widely distributed; it reflects how common the app is, not what it contains.
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Sign in
Email and a code, or a username and a password.
The browser permission applies to that browser only, and you can revoke it as soon as the install is done. Blackbird asks for its own only when it installs an update, and says why before sending you to that screen.
Afterwards
Updates take care of themselves
Blackbird checks on launch, shows what changed, verifies the download against the server's fingerprint, and installs it.
Dismiss one and it waits — a patch three days, a release a day, a major update twelve hours. Or check whenever you like from Settings.
Other platforms
Android only
Blackbird is available for Android only. There is no iOS, desktop or web version, and none is in development.