And you won't notice this, but this allows us to much more easily scale workloads. If you hibernate a VM after an hour, you will often get 300, 400 concurrent VMs. When you compare that with hibernating a VM after five minutes, you will usually have 30, 40 concurrent VMs. That makes it very easy for us to host. So we're doing a lot of tricks behind the VM that will make it easier for us to both scale this, but also make it cheaper for us to scale and because of that we can make it free and we will always want to have Code Sandbox free for open source.
In the end for private repositories, that's when we want to ask money, ask a subscription, so to say. Ask or enforce. All right. How are you able to pay for the infrastructure cost then? My favorite spare time projects typically also burn a big hole in my wallet. Asked by David.
Yeah, so when Code Sandbox was, when we were just students, we only made €500 a month and that was our student loan and we paid €300 of those euros to our housing. So we had €200 a month to really spend for our food and to spend for Code Sandbox. So that's why the first version of Code Sandbox ran everything in the browser and for the first two years, we were able to scale Code Sandbox to 500,000 monthly users on $40 a month of hosting because it was a Elixir server backend. It was a Postgres database connected to it and then there was a very heavy, thick client in front of it that was served by Cloudflare. And that allowed us to really scale it to so many people. And then from then on, we've raised funding, first a Series C and then a Series A, and this allows us to also scale it on VMs. So that is the… Oh, and actually, we also have a subscription. There are companies also paying for Code Sandbox today which allows us to finance all our hosting. So yeah.
Okay. Well, sounds like in your student days, you grew up on noodles. Yeah, it was weird. When we started raising money from investors, at some point, we were in a call with an investor and there were people playing beer pong in the hallway, and they were shouting really loud. And the investor, we were trying to be very neutral, and the investor was saying, What are those sounds? We just said, yeah, people playing beer pong. And he was very cool with that. He proposed to come to the university to meet us. It created a very weird contrast of students versus… The investors know that it's a student company, right? So they know it's work hard, play hard.
Alright, next question from Jeroen. Does Code Sandbox projects also… Oh, that's not marked as done yet. Question from anonymous.
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