This simple local web app can assist you in following a timetable, whether it's a bus route, a train timetable, or anything else you can imagine. The routes are read from text files, and are easy to customize for any needs.
The page is responsive. You may use it on mobile, desktop, a tablet, or any device. It only requires a basic browser with JS support. No libraries, no npm things.
It is optimized to handle routes with thousands of stops without performance loss.
Open up the page, and click on Load Route. Select a .txt file (see samples folder for documentation), and select a start time for the route. After that, departure times for stops will be calculated. The next stop will always appear with a color background on the bottom.
To advance to the next stop as you're done with the current one, click on the timer button. The timer shows time until departure.
Sample route, 3 min late for the departure
Route start time picker
Check out the demo here.