There are plenty of fancy Nixie tube clocks on the market. Not all of them can be controlled with a smartphone or voice assistant. The ONE Nixie Clock is a single digit Nixie Clock with app and Alexa control. The clock is based on the Arduino Nano. It displays the time digit by digit after which the whole cycle is repeated.
This clock has a RTC module to keep accurate time. 26 interchangeable Nixie tube sockets are available for you to experiment. Owners have the option to sync time over WiFi. The ONE Nixie Clock also has RGB LED backlight. It can be controlled with an iOS or Android device.[where to get it]