A website and a web application get quoted in the same breath and they are not the same job. A website tells people what you do and gets them to call or message. A web application does work: someone logs in, it stores their data, and what a person sees depends on who they are. The confusion costs money in both directions, because a business that needed a website ends up paying for logins and roles it never uses, and a business that needed a login system gets a pretty homepage with a contact form bolted where the database should be.
This page is written for the second case: the point where a spreadsheet four people email around, or a WhatsApp group where the real coordination happens, has quietly become the way the business runs. That is a web application problem, and it has its own budget, timeline and set of questions worth asking before you sign anything.