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Huh? You can't reasonably use Python or Ruby on the frontend, so there aren't webapps using Python or Ruby for their whole stack.

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Maybe not today (reasonbably). But, until recently there were many apps (and still possibly many are) using Django (python) and Ruby on Rails (Ruby) as their development stack for web apps. Atleast for Ruby on Rails, I know of some popular apps that were built using it like Airbnb, Github, Spotify, Twitch, Soundcloud etc.

No, you've misunderstood. OP said:

"only language for full stack of this app"

The sites you mentioned used JavaScript on the client side, so Python and Ruby were not used as the only language for the full stack of those sites.

> You can't reasonably use Python or Ruby on the frontend

You can use Ruby via Opal, and there are a few front-end (and at least one isomorphic full-stack) frameworks.

For Python there is Brython, but I don't know of any FE frameworks.

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