# Refactor legacy interfaces without breaking the system

Modernize outdated UI surfaces directly in your codebase while preserving structure, logic, and system integrity.

### Update legacy UI without rewriting everything

Start from existing screens and incrementally improve layout, components, and structure. Fei works within your current codebase so changes don’t require full rewrites.

### Move toward modern standards safely

Migrate interfaces to modern components and patterns while preserving behavior. Improve consistency and usability without breaking anything.

# Fei Studio empowers the whole team

Including Product Managers, Designers & Engineers

### Use cases

- **Validate Product Ideas**  
  Turn early ideas into production-ready changes, release them behind feature flags, and learn from real user behavior before committing fully. [More info](/content/use-cases/validate-product-ideas/index.html)

- **Prototype With Real Code**  
  Designers prototype new experiences directly in the product environment instead of relying only on static mockups. [More info](/content/use-cases/prototype-with-real-code/index.html)

- **Accelerate Feature Delivery**  
  Move from product requests, screenshots, or tickets to production-aligned pull requests faster by reducing handoffs. [More info](/content/use-cases/accelerate-feature-delivery/index.html)

- **Improve Existing Features**  
  Refine existing product experiences and workflows without rebuilding them from scratch. [More info](/content/use-cases/improve-existing-features/index.html)

- **Refactor Legacy Interfaces**  
  Modernize legacy UI surfaces and migrate them toward current component standards while preserving the structure of the real codebase. [More info](/content/use-cases/refactor-legacy-interfaces/index.html)

- **Rapid Product Iteration**  
  Explore multiple variations of product flows quickly inside the real product environment to accelerate discovery and refinement. [More info](/content/use-cases/rapid-product-iteration/index.html)

- **Stakeholder Demos**  
  Create realistic demos using the real product environment instead of static mockups for leadership or customer conversations. [More info](/content/use-cases/stakeholder-demos/index.html)

- **Design System Alignment**  
  Generate product updates that reuse existing components and patterns to maintain consistency across the application. [More info](/content/use-cases/design-system-alignment/index.html)

- **Turn Support Feedback Into Product Changes**  
  Translate customer feedback, bug reports, and support tickets into concrete product improvements aligned with the codebase. [More info](/content/use-cases/turn-support-feedback-into-product-changes/index.html)

- **Explore UX Improvements**  
  Experiment with navigation, layout, and interaction improvements directly in the real product environment. [More info](/content/use-cases/explore-ux-improvements/index.html)

- **Build Enterprise Customizations**  
  Create tailored product experiences required for enterprise customers while keeping changes aligned with the existing architecture. [More info](/content/use-cases/build-enterprise-customizations/index.html)

- **Test Feature Variations**  
  Generate alternative versions of product flows and interfaces to explore new directions before committing to implementation. [More info](/content/use-cases/test-feature-variations/index.html)

# Modernize your product without starting over

Connect your repo and start turning product ideas into real, testable changes.

[Start Free Trial](https://studio.autonomyai.io/sign-up/)

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