You've got a couple of options: 1. Ads through Ethical Ads or Carbon Ads. This is what I have with nslookup. It's at $500/month on these volumes: https://plaus

You've got a couple of options: 1. Ads through Ethical Ads or Carbon Ads. This is what I have with nslookup. It's at $500/month on these volumes: https://plausible.io/nslookup.io https://plausible.io/nslookup.io 2. An exclusive ad deal with a complementary service. That's what I have with whoismyisp.org. Think about what people are working on when they visit your tool, then find a service that they'll need right after that task. 3. Donations 4. Sell a course. i.e. "DNS for developers" for nslookup.io. 5. Add a paid API. i.e. DNS lookup API for nslookup.io. 6. Add a SaaS that does something similar, but more complex. i.e. monitoring DNS records for nslookup.io.