Nixie Clock WiFi Setup Without an App — Does It Need the Cloud?

What WiFi is actually used for on these clocks

Commonly, a WiFi-enabled clock in this category uses its network connection for two things: syncing accurate time from an NTP (Network Time Protocol) server, which is what lets it stay accurate to the second indefinitely rather than drifting like a standalone RTC, and checking for firmware updates over the air. That's a general pattern for this type of device rather than a confirmed feature list for every model sold on this site — the specifics for each board revision are noted below.

Setup flow

Whether initial setup is done via a captive portal the board itself broadcasts, a companion phone app, or a web configuration page, and whether a companion app is required at all versus optional, is model-specific detail that isn't yet written up on this page.

Ongoing network dependency

For most designs in this category, once initial setup is complete the clock only needs to reach the internet briefly and periodically for a time sync, not continuously. Whether these specific models can run fully offline after setup (accepting gradual drift on their onboard clock), and whether any data beyond an NTP request ever leaves the device, is covered in the workshop note above and will be filled in with confirmed specifics before this guide is considered final.