Blackjack

Paul Raffer

Card

Blackjack is an open-source (MIT) Android game by Paul Raffer. The APK we host is 3.3 MB, it needs Android 4.1 or newer, and it declares no permissions at all.

The file on this page is Blackjack 0.29.1, 3.33 MB, and it installs on Android 4.1 and newer.

We compared the signing certificate of this build with the certificate recorded the first time crypto.o0o0o0o0o.games.blackjack entered the site, and published both the file's SHA-256 and the certificate's fingerprint above so you can check the download yourself. That comparison says the file was not repackaged by someone else; it is not a review of what the game does.

The manifest declares no permissions at all.

Its licence is MIT. We took this build from F-Droid, and the source for this exact version is linked below.

The most recent release upstream is from Sep 22, 2021, over 4 years ago. It still installs; it is simply not being updated.

We do not show a star rating or an install count for this page: we have no measured figure for either, and a number we cannot source is worth less than an empty field.

Download APK · 3.33 MB

Version: 0.29.1
Size: 3.33 MB
Requires Android: API 16
Package: crypto.o0o0o0o0o.games.blackjack
Signature checked on: Sep 17, 2026
Where this file came from: F-Droid
Licence: MIT
Source code: Source for this version

File SHA-256: 70e9979d2fd731cbb941f91f9308deb993f7cc8c839bbe94947aa92f2d371303

Signing certificate (SHA-256): 0a34e6d70bd76cb83952e164b176e8a44e6ddc0971edab93c67c7d383b920a04

We check that this file carries the same signing certificate as earlier releases of the same package. That shows the APK was not repackaged by someone else — it is not a security review of the app.