YouChat for Whatsapp
complete
Sami (from You.com)
complete
Felipão thanks for reporting.
We heard your feedback and launched on WhatsApp last month 🚀
Try it out today at: https://wa.me/15854968266/
Christian de la Cruz
Or Telegram. I think it's pretty much to ask because they need website visitors and interaction, but another option is to have YouChat independent of the mobile browser