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Pro Free credit
You get free starting credit to use, with no other limitations.
Pro Free tier
Google Cloud Computing has a free tier. It's not a trial, it's just limited, but always free to use.
Pro Pay per minute
Pay per minute plans make it cheaper to use for many users, since at 2 hours and 1 minute you don't pay for 3 hours, but rather for 2 hours and 1 minute.
Con Poor support for sql databases
You don't have a lot of options besides mysql.