App or map for using buses in Bangkok?

Hey everyone!

I’ve got a question about buses, which we love using in Bangkok, but it’s always a bit of a challenge to figure out how to get around. We always (eventually) reach our destination because there’s always someone willing to help us find our way, but this year, I’d like us to be a bit more independent. We’re a bit old-school—we like traveling without phones for a real digital detox (no judgment, everyone travels how they like! :) ), so ideally, we’d find an up-to-date map of Bangkok’s bus network, but we don’t know where to buy one... We managed to get one back in 2015, but I think it’s outdated now, and during our last trips, we couldn’t find any...

And if traveling like this is really outdated, could you recommend a reliable app for buses? That way, we could plan our routes using the hotel’s Wi-Fi before heading out.

Thanks in advance for your help, and have a great day!