The best alternatives to StackBlitz are DigitalOcean, Render, and Bunnyshell. If these 3 options don't work for you, we've listed over 10 alternatives below.
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Snowflake O'Reilly Report— Design a Modern Application Data Stack
Bunnyshell is an Environment as a Service platform that enables developers to autonomously create and manage dev and staging cloud environments on any cloud for any application.
1MB is a host where you can easily spin up static websites. Each w/ their own custom domains + SSL. 1MB also features an intuitive code editor you can access directly in your browser. Your drafts and open tabs are saved in the cloud so you can pick up anywhere
FlashDrive NoOps app platform handles everything for you while you focus on your product. Made by developers for developers, FlashDrive is compatible with Git deployment (Github, Gitlabs etc...), DockerHub etc... Free backups, SSL certs. and load balancers.
Jexia provides backend services for application development to relieve developers from so called "necessary overhead". No need to setup or maintain servers/containers, install databases, create APIs or do repetitive coding.
Lunatic is an open source runtime that combines the fault-tolerance and massive concurrency of Erlang with the capability-based security model of WebAssembly. It can be used from any programming language that compiles to WebAssembly.