Agree. to this day none of them match heroku's magical DX... which makes it more mind-boggling that SalesForce seems to be really intent on just throwing it away.
Render.com seems to be the closest. It's gotten a lot closer in the past two years. And is basically trying to be more or less a clone of heroku, with a few minor update tweaks for how the world has changed (while heroku has not).
Maybe it'll reach it before heroku fully implodes -- although it's hard because so much of heroku is also the ecosystem, that so many third-parties are adding value to heroku too, from add-ons, to just writing documentation for how to integrate their thing with heroku, to external non-approved "add-ons". (If the hirefire.io developer is reading this... hirefire for render?)
Fly.io is also really interesting -- for trying to do something different than heroku, actually much more sophisticated/interesting than heroku, but the trade-off is that it's not really as management-free as heroku, it has seemed to me. (I don't want to write a Dockerfile, nope). But maybe it'll get closer too.
I agree wholeheartedly to all this and honestly, Heroku has been the gold standard I loved for years, and because of the decline had started building my own alternative with the rest...
Biggest differentiator with me and the rest? They focus on "look you can git push to deploy, we're just like Heroku!" while I am all about this DevEx.
So like parent OP said about what is comparable is my goals too.
I hope my product and vision of being "What if we rebuilt Heroku on today's tools with the DevEx?"
Render.com seems to be the closest. It's gotten a lot closer in the past two years. And is basically trying to be more or less a clone of heroku, with a few minor update tweaks for how the world has changed (while heroku has not).
Maybe it'll reach it before heroku fully implodes -- although it's hard because so much of heroku is also the ecosystem, that so many third-parties are adding value to heroku too, from add-ons, to just writing documentation for how to integrate their thing with heroku, to external non-approved "add-ons". (If the hirefire.io developer is reading this... hirefire for render?)
Fly.io is also really interesting -- for trying to do something different than heroku, actually much more sophisticated/interesting than heroku, but the trade-off is that it's not really as management-free as heroku, it has seemed to me. (I don't want to write a Dockerfile, nope). But maybe it'll get closer too.