Online instances are accessed using any web browser and do not require a local installation.
To quickly try out Odoo, shared demo instances are available. No registration is required, but each instance only lives for a few hours.
Odoo Online provides private instances which are fully managed and hosted by Odoo. It can be used for long-term production or to test Odoo thoroughly, including customizations that don’t require code.
Odoo Online is incompatible with custom modules or the Odoo App Store.