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What moves a quote within a range is rarely the number of screens. It is the number of integrations, the number of distinct user roles, and whether the data has to reconcile with a system you already run. Three roles cost more than three extra pages.

Rates vary by region for reasons that have nothing to do with code quality. A team in London or New York carries an office, a sales function and account management. An independent contractor in Cairo carries none of those, which is most of the difference in the invoice.

The estimate you can trust is the one that comes after a scope document, not before it. Any number given before someone has asked who uses the system and what it connects to is a guess dressed up as a quote.