It Ditches the Virtual DOM
For years, the Virtual DOM (VDOM) was React’s killer feature. The idea is that when state changes, the framework builds a new virtual UI tree, compares it to the old one, and then efficiently updates the actual browser DOM. But here's the catch: this
comparison, or "diffing," is still work. Solid.js looked at this model and asked what if we could skip that step entirely. Instead of a VDOM, Solid compiles your code into highly specific, direct DOM update instructions. When a piece of state changes, only the exact part of the DOM that depends on it is touched. There is no diffing, no virtual tree, and no re-running entire components just to see what changed.
Speed Through Fine-Grained Reactivity
The secret sauce behind Solid's performance is a concept called fine-grained reactivity. At its core are "signals," which are reactive state primitives. Think of them like a spreadsheet cell: when a value in one cell changes, only the other cells that directly reference it recalculate. That’s how Solid works. Your component functions run only once to set up this reactive graph. After that, changes flow automatically. This approach is incredibly efficient, consistently placing Solid at or near the top of performance benchmarks, with speeds that are often closer to vanilla JavaScript than to other frameworks. The result is an application that feels incredibly fast, even with complex, data-heavy interfaces.
A Modern But Simpler Developer Experience
For anyone coming from React, Solid looks incredibly familiar. It uses JSX, the same syntax for mixing UI and logic, which makes the initial learning curve feel gentle. However, it sheds much of the complexity that has built up in the React ecosystem. There are no dependency arrays for effects, which are a common source of bugs for developers. State management is largely handled by built-in primitives like signals and stores, reducing the need for external libraries. This creates a powerful but streamlined experience: you get the declarative power of modern frameworks without the mental overhead of tracking dependencies or optimizing against the framework's own rendering model.
Its Ideas Are Winning, Even If Its Market Share Isn't
Here’s the most crucial part of the “winning” argument: Solid’s influence now extends far beyond its own user base. The concept of signals and fine-grained reactivity has been so compelling that other major frameworks have taken notice. Angular, for example, directly credited Solid's creator, Ryan Carniato, for his insights during the development of their own signals-based reactivity model. While React still dominates in terms of downloads and job openings, Solid has won the war of ideas by proving that a more performant and, arguably, more direct model of reactivity is possible. Its success has forced the entire industry to re-evaluate long-held assumptions about how web applications should be built.
So, Has It Really 'Won'?
In terms of raw adoption numbers, React is still the undisputed king. Finding developers or third-party libraries is far easier in the React ecosystem. However, if you define "winning" as setting the technical agenda and providing a glimpse into the future of web development, then Solid has undeniably earned the title. It delivers on the promise of a truly reactive UI with best-in-class performance and a remarkably small bundle size. The ecosystem is maturing, with its own meta-framework, SolidStart, becoming more stable and feature-rich. The "war" isn't just about who has the most users today; it's about who is building the foundation for tomorrow. And Solid.js has built a very strong one.
