"Should we build this as a custom app or just use WordPress?" is one of the most common questions we get from prospective clients — and the honest answer is usually "it depends on what you actually need it to do."
Signs a CMS Is the Right Choice
If your website's core job is to present information, generate leads, or sell a defined catalog of products, a well-built CMS (WordPress or Shopify) is almost always the right call. It's faster to build, cheaper to maintain, and easier for non-technical staff to update. Marketing sites, service businesses, blogs, and most e-commerce stores fall into this category — see our WordPress vs custom code comparison for a deeper breakdown.
Signs You Genuinely Need Custom Development
- **Proprietary interactive functionality** — calculators, configurators, dashboards, or tools that don't exist as CMS plugins
- **User accounts with complex logic** — SaaS products, membership portals, booking systems with custom business rules
- **Programmatic SEO at scale** — generating thousands of dynamically-templated landing pages from a database (e.g. a directory or comparison tool)
- **Real-time data** — live pricing feeds, dashboards, or anything requiring persistent connections
- **Performance at extreme scale** — very high-traffic applications needing specific caching or edge architecture beyond what a CMS handles out of the box
The SEO Trap With Custom Apps
The single most common SEO mistake with custom React or Vue applications is shipping them as a pure client-side single-page app. Search engine crawlers can index client-rendered JavaScript, but it's slower, less reliable, and puts you at a disadvantage versus server-rendered pages — see Google's JavaScript SEO documentation for the technical detail. Any custom app that needs organic search visibility should use server-side rendering (SSR) or static generation — frameworks like Next.js exist specifically to solve this.
Where Custom Code Has a Real SEO Advantage
Programmatic SEO — generating thousands of unique, useful landing pages from structured data — is genuinely easier to do well with custom code than with a CMS. If your growth strategy involves targeting long-tail search queries at scale (location pages, calculator variations, comparison pages), a custom-built system with proper templating and internal linking will outperform trying to force that structure into WordPress.
The Framework
Ask yourself: does this functionality exist as a mature CMS plugin or theme feature? If yes, use the CMS — it's faster, cheaper, and just as capable of ranking well when built cleanly. If the answer is genuinely no, and the functionality is core to your business model, custom development is worth the investment — just make sure whoever builds it treats SSR and technical SEO as a requirement, not an afterthought. See our Custom Web App & SaaS Development service for how we approach this.