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You are right about developer tools, but these companies are not selling developer tools. Plus, the technical implementations are non-trivial.

It seems like Materialize has some interesting approaches in mind:

> but these companies are not selling developer tools

Welll ... from their website:

> Red Planet Labs is pioneering a radically new kind of software tool.

Also, the Materialize "reactive SQL" solution sounds a lot like Firebase.

Firebase is a hosted database. Where does a dev tool begin and end? Is Slack a dev tool? Is HN? Where do you draw the line?