No idea if this is comparable: https://activeadmin.info/

Edit: What a long strange trip it's been. According to my old bookmarks, wycats developed a rails admin module about 10 years ago (code not available today). I discovered that he also worked on Merb, sort of a fork of Rails, and then after helping to merge that back into Rails, he helped sferik port MerbAdmin to RailsAdmin, which exists today!

https://github.com/sferik/rails_admin

I will definitely have to try Rails 5 and see what's up, it looks like I missed a lot over the years.

Just a heads up: Admin gems are only suitable for projects that are simple and stay simple. If you want to do something that's not provided by your admin gem, you'll be fighting it. I have gone through that arduous path myself multiple times, only to end up rewriting everything from scratch.

I would love to know if Django's Admin fares better in this regard.

More: http://rubyjunky.com/get-rid-of-your-admin-gem.html

I've used the Django admin in pretty much every production project I've touched. It's the bees' knees. There's some customization overhead that becomes higher than doing your own thing is you really want to make your own admin views, but at that point nobody's stopping you from making dashboards from scratch.

I came to a similar conclusion in Django. I now build my own admin interfaces.

Not built in but it's really easy to build it yourself or use a Gem like ActiveAdmin.