\begin{frame}
  \frametitle{Vergleich Messenger}
  \small
  \begin{tabular}{|c|c|c|c|c|c|}
    \hline
                      & Whatsapp            & Threema             & Telegram              & Signal                & Jabber              \\
    \hline
    Verschlüsselung   & \cellcolor{green}  & \cellcolor{yellow}   & \cellcolor{orange}    & \cellcolor{green}     & \cellcolor{green}   \\
    \hline
    Vertrauensw.      & \cellcolor{red}     & \cellcolor{yellow}  & \cellcolor{orange}    & \cellcolor{green}     & \cellcolor{green}   \\
    \hline
    Dezentr.          & \cellcolor{red}     & \cellcolor{red}     & \cellcolor{red}       & \cellcolor{orange}    & \cellcolor{green}   \\
    \hline
    Open Source       & \cellcolor{red}     & \cellcolor{orange}  & \cellcolor{yellow}    & \cellcolor{green}     & \cellcolor{green}   \\
    \hline
    Mobileignung      & \cellcolor{green}   & \cellcolor{green}   & \cellcolor{green}     & \cellcolor{green}     & \cellcolor{yellow}  \\
    \hline
  \end{tabular}
\end{frame}