Torus hosting is completely open source and free. There are no tiers, so don't worry that it will get more expensive as you grow. However your website's traffic can incur in costs with your cloud infrastructure providers. Nonetheless you only pay for what you use and costs are 100% variable.
Let's say you have 10,000 new visitors a day for a month. Each visitor clicked 1 page and returned a single request of 1mb each for a total of 300GB. Half the requests are from Europe and half from USA. The total cost for your website turns out $27.53.
|Route 53 DNS||$0.50|