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Ask HN: What HN-like forum software is substack using?

I was recently introduced to substack[1] and was immediately impressed by the threaded discussion software that they are using.

Here is an example:

https://frenchpress.thedispatch.com/p/politics-is-a-jealous-god/comments

What forum software are they using ? Is it homegrown/in-house ? Other than lobste.rs, it is the nicest clone of HN I have ever seen ...

[1] https://substack.com/

( 5 comments | 10 points | on HN )
Re:Ask HN: What HN-like forum software is substack using? by cjbest on Monday December 30, 2019 @05:33PM (#21917285)
One of the founders of Substack here.

It's built in house. Thank you for the kind words. I'm not sure I'd call it a clone of HN, but that's definitely one of our influences :)

Re:Ask HN: What HN-like forum software is substack using? by tjansen on Monday December 30, 2019 @03:05AM (#21911621)
Check their jobs page: "We use: Node, Express, React, Postgres, Heroku"

https://substack.breezy.hr/p/395577ab518c-full-stack-enginee...

Re:Ask HN: What HN-like forum software is substack using? by ofrzeta on Monday December 30, 2019 @04:30AM (#21912091)
What I can see is not that different from Disqus that has a free alternative called Isso https://posativ.org/isso/
Re:Ask HN: What HN-like forum software is substack using? by lykr0n on Sunday December 29, 2019 @11:36PM (#21910844)
My money is on in-house.

Express based webapp on Heroku. If it's a plugin, I would start looking in NPM

Re:Ask HN: What HN-like forum software is substack using? by sk221 on Sunday December 29, 2019 @11:33PM (#21910834)
It looks like it's built in house.