You can use iHosts for free, but could add at most 4 nodes. You can upgrade to advanced account to add more in 'Preferences... > Account'.
- Upgrade to iHosts Plus, add at most 10 Hosts nodes.
- Upgrade to iHosts Pro, add at most 50 Hosts nodes.
You can choose iHosts Plus or iHosts Pro based on your requirement.
Of course, if you think iHosts is good, and willing to support iHosts to keep on improving, you can also support iHosts by upgrading to advanced account. Thanks in advance.