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Digital Ocean - Good prices, documentation and they have something similar to Heroku with App Platform. Good for small and big projects.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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Vercel - Never used but and it seems very specific for Frontend developers.
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supabase
The open source Firebase alternative. Supabase gives you a dedicated Postgres database to build your web, mobile, and AI applications.
Subpabase - Like Planetscale this is only for databases. It is an open source Firebase alternative for building secure and performant Postgres backends with minimal configuration.
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Render - I think render is more like a cloud agnostic builder/runner platform, this means that your application needs to be hosted somewhere else.
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Railway - Language agnostic and for projects big and small. Never used but it seems very easy to use like Heroku.
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Pocketbase - Never used before but it says in their home page the following: "Open Source backend for your next SaaS and Mobile app in 1 file". Seems porwerful.
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Planetscale - Directly from their website: "PlanetScale is a MySQL-compatible serverless database that brings you scale, performance, and reliability — without sacrificing developer experience."
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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And last but not least, Netlify, which is the one I use to host this website(for free). Hugo + Netlify is a powerful combination.
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Fly.io - Very similar to Heroku too, easy to use and support for multiple stacks/languages.
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amplify-flutter
A declarative library with an easy-to-use interface for building Flutter applications on AWS.
AWS Amplify - Very easy to use, connects to your github repository and can also create review apps based on branches.