Best simple Online Countdown Timer. Set the desired timer time at the end of which you will hear a beep. No extra tweaks, just a clean, minimalist design.
online-timer.org appears in the published seller files of 1 advertising network. Each row below is that network's own declaration that it is authorised to sell this site's inventory, with the date the relationship first appeared in the record.
Same niche, closest authority score — the competitive set a network would compare online-timer.org against.