The question “should I use LWC or Aura?” has a clear answer for all new development in 2026 — LWC. The more nuanced question is what to do with existing Aura components, and how to make the most of LWC’s rapidly expanding feature set including the significant Summer ‘26 additions.
What LWC is and why it replaced Aura
Lightning Web Components, introduced in Spring ‘19, was built from the ground up on modern web standards — ES Modules, Web Components and Custom Elements. This is fundamentally different from Aura, which introduced its own component model, event system and JavaScript syntax that had no equivalent outside Salesforce.
The consequences of this architectural difference are significant.
LWC runs natively in modern browsers without a heavy framework shim, which means faster initial render times and lower memory overhead. LWC follows standard JavaScript and HTML conventions, which means developers with general web experience can be productive faster. LWC benefits from browser vendor optimisations for the Web Components standard, which continue to improve without Salesforce having to do anything.
Summer ‘26 LWC updates that matter
Live Preview is now GA
The single most impactful developer experience improvement in Summer ‘26 for LWC developers is Live Preview becoming generally available. Previously called Lightning Preview, it renders a single component directly in VS Code or Salesforce Web Console as you type — no full page reload required.
Previously, the typical development loop was: write code → save → wait for server push → reload the entire Lightning page → find the element you changed → assess the result → repeat. With Live Preview, the loop collapses to: write code → see result immediately.
LWC State Management is now GA
State Management solves one of the longest-standing pain points in LWC architecture: sharing state between sibling components without a server round-trip. Before State Management, passing data between two components that did not have a direct parent-child relationship required Lightning Message Service, custom pubsub patterns, or re-fetching data from the server.
State Management provides a centralised reactive state store that multiple components can subscribe to. When one component updates state, all subscribed components automatically re-render with the new values. This is particularly valuable for complex pages with multiple components showing different views of the same data.
Custom LWCs in Dashboards GA
You can now embed custom LWC components directly into Lightning dashboards. This brings truly interactive, custom visualisations to the dashboard surface without requiring a full custom app.
CSS Container Queries
LWC now natively supports CSS Container Queries — a web standard that allows components to apply styles based on their container’s dimensions rather than the viewport width. A single card component can now adapt its layout whether it is in a narrow sidebar or a wide main column without JavaScript.
When Aura is still the right choice
Aura is not deprecated and Salesforce has not announced an end-of-life date. It continues to receive updates and security patches. There are scenarios where staying with Aura is the pragmatic decision.
The clearest case is a large existing Aura codebase. If your org has hundreds of Aura components that are working correctly, the business case for a complete rewrite rarely stacks up. The good news is that interoperability exists — you can embed LWC components inside Aura containers. This allows gradual, feature-by-feature migration rather than a big-bang rewrite.
Interoperability
LWC and Aura interoperability works in one direction only. You can embed LWC inside Aura — an Aura component can use an LWC component as a child. You cannot embed Aura inside LWC. This constraint reflects the architectural reality: LWC’s shadow DOM encapsulation is incompatible with Aura’s global CSS model.
The migration decision framework
Before committing to migrate an Aura component to LWC, ask four questions. Is the component actively being developed? If it is stable and rarely changed, migration ROI is low. Is the component a performance bottleneck? LWC’s render performance advantage is most valuable for frequently-rendered, complex components. Is a new feature required that is LWC-only? Many new Salesforce platform capabilities are LWC-first. Does the team have LWC expertise? Migration without LWC knowledge creates risk.
For new components, the answer is always LWC. No new Aura components should be created in 2026 unless there is a very specific technical constraint that makes LWC impossible for that use case.
Test your knowledge — LWC & Aura
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