Based on our record, Slackin seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
The link was set up using app called SlackIn https://github.com/rauchg/slackin to get into public slacks painlessly. Seems like the project is abandonware & the API it's using was deprecated in 2021. Source: over 1 year ago
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