Web App Utilities & Features

What this is A brainstorm-and-build catalog for anyone designing, building, or scaling a modern web application — SaaS, internal tool, marketplace, or regulated enterprise system. It covers 368 categories and roughly 2,450 implementation-specific bullets: libraries, routes, tables, columns, endpoints, and technical decisions a coder can act on directly. Each category carries a Recommendation / Tip / Note / Watch-out block, so the map works as a build guide, not just a list.

What it is not A build plan. No product needs all of it — a typical SaaS touches 40–60 categories meaningfully, a focused internal tool touches 8–12. The value is in the menu: scan to spot gaps, name concerns early, pick what fits your stage, and hand chosen items to a coder with the vocabulary to implement them. The biggest risk with a list this size is building too much; the map helps you drop, not accumulate.

How it is ordered General → specific → private. Universal product and UX foundations first, then application, SaaS platform, security and audit, infrastructure, admin consoles, verticals, replication and sync, system and database administration, special-needs audiences, SEO, and finally browsers, responsive layout, errors, and sessions. Cross-referenced against 10 rings — from Ring 0 (special needs, applies to everything) through Ring 8 (frontier tech, watch but do not build yet), plus a Meta ring (m) for cross-cutting frameworks.