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It's amazing how many really interesting and deeply thought-out dev platforms are being built right now. We're lucky! Aside from these 3, replit is doing unique things by integrating the development experience from writing code all the way through hosting, and while they don't compete with a full PaaS like fly for hosting complex apps, for smaller services they are better than people realize already.

I would also be remiss not to mention Coherence (withcoherence.com) [I'm a cofounder] where we're trying to deliver some of the same magic as the best in class PaaS's above, but we are running your workloads in your own AWS or GCP account. We're really excited about the potential future of a great developer experience that can be delivered as a service instead of rebuilt over and again by platform teams in-house.