Signing up to MyHeritage is completely free and allows you to build your own family site. Basic sites are free to create. With your Basic family site, you can add up to 250 individuals in the family tree(s) you build. If you add photos and scanned documents to the family site, the limit of storage space is 500 MB.
If you stay with a Basic subscription and created your family tree in Family Tree Builder, you will be able to sync it with your online family site as long as it doesn't go over the limit of 250 individuals.
If your tree grows and you need more storage, you can upgrade your family site at any time with a site subscription.
Read the following articles for more details about the Premium, PremiumPlus subscription types:
We also propose a Complete subscription that combines a PremiumPlus site subscription with a Data subscription, providing unlimited tree size and storage plus access to all the paid collections of historical records in the MyHeritage Search Engine.