It's free. Bookmark.house is primarily aimed at being managed with revenue from Google AdSense. You can use Bookmark.house service for free.
If you are using an ad blocker such as AdBlock, it will be helpful if you can whitelist "bookmark.house" domain.
Purchase to support Bookmark.house
You can pay web service fee via PayPal to support Bookmark.house.
Even if you purchase or do not purchase a service fee, there is no difference in the service content that we offer. Please purchase if you are interested to support us.