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 will say it does not recognise the app. It flags anything it has not seen distributed at scale — a statement about how common the app is, not about what is in it.
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Sign in
Email and a code, or a username and a password.
The browser permission is per-app and yours to revoke immediately afterwards. 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
No iOS, desktop or web client, and none in progress. Distributing outside the App Store is not practical for independent work, and there is no point promising a date for something unstarted.