What addon format should I use to share it with other users easily

I need to implement 2 addons over Airtable basic functionality. First one is a search filter (view) over specific structure database. The second - is just a function to calculate values of specific cells in the table depending on other cell values (again for table with specific structure). The key requirement for me is to let other Airtable users easily use my addons for their tables.

What addon format should I use to accomplish that?

p.s. currently my programmer involves API for implementation, but as far as I understand the result addon is not so easy to share