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What size droplet do you use and what kind of apps do you develop on it?

I see the cheapest one has only 512MB RAM.

It is VIM, not Eclipse. A few megabytes of memory is really all you need.

Depends if you also want to run tests, like one often does in their local machines.

I have the $10 package with 1GB RAM but the smaller one for $5 with 512MB should also work (depending on your use case/dev environment).