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Hexagonal and Onion Architecture are frequently confused because both rely on Dependency Inversion to protect business logic from external tools. The key distinction: Hexagonal (Ports & Adapters) focuses on the application boundary — what enters and exits — while Onion Architecture focuses on internal layering with concentric circles (Domain, Application, Infrastructure). A side-by-side comparison clarifies terminology, visual models, and use-case placement. PHP/Symfony code examples demonstrate Ports as interfaces and Adapters as implementations, plus a hybrid folder structure most teams actually use. Common pitfalls covered include anemic domains, interface overkill, and leaky infrastructure exceptions. The verdict: use Hexagonal for many entry points, Onion for complex business domains, and accept that most real projects are 'Hexagonal-ish Onions.'

Hexagonal vs. Onion Architecture Explained ‣ harasim.dev

Marcin Harasim

The goal:
<ol>
<li>Hexagonal Architecture</li>
<li>Onion Architecture</li>
</ol>
Reality:
Spaghetti Architecture

This doesn’t make sense.
The notion that you need to choose between hexagonal or onion architecture is misguided.
They complement each other and serve different perspectives on software architecture.
DDD, onion architecture, ports and adapters, you name it.
They work together well and are not competing dogmas.
It’s not either/or, a religion you chose between. They are all guiding common sense principles for creating code that stands the test of time better.