Hello everyone,
The number of lines of code (LoC) displayed on https://apps.odoo.com/apps represents the total lines of code included in a module when you get it. All these modules must be deployed either through https://www.odoo.sh/ (PaaS) or on-premise (self-hosted). Only industry modules developed by Odoo itself (https://apps.odoo.com/apps/industries/browse) can be installed on the SaaS version (custom pricing plan).
Maintenance fees:
By default, custom code is not maintained by Odoo. This means that for all the modules listed on apps.odoo.com, you can deploy them on-premise or via odoo.sh without incurring any maintenance fees.
On our SaaS platform, if you want to install an industry module that includes custom code, maintenance fees will apply. Additionally, it is not possible to deploy third-party modules (not written by Odoo) on SaaS.
For third-party modules on Odoo.sh (PaaS) that you wish to have maintained by Odoo, you must contact us. We will first conduct a paid code review. If necessary, we may rewrite parts of the code to optimize it. If we agree to maintain the code, a fee of €16/month per 100 LoC (depending on your country and applicable price list) will be charged. To qualify for maintenance by Odoo, the module must be hosted on odoo.sh and stored in Odoo's repository, not yours.
The same principles apply to any custom code you write on your database (in Python, JavaScript, CSS, etc.). Odoo considers this custom code as equivalent to a third-party module, which is not maintained by default if you are on-premise or using odoo.sh with your own repository.
For Odoo Community, there are no maintenance fees at all (as it's on premise by default).
I hope this clarifies the situation.
--
Alexandre Demeyer