Live webinar series: Weekly round-tables with industry leaders from product, desig & engineering. Sign up →
Start Free Trial
Start Free Trial
Start Free Trial

The OS for
Building in Production

Fei Studio lets Product and Design teams build and ship features directly inside complex, existing codebases.
Unleash your Product Development Lifecycle.
Start Free Trial
Contact Sales

How it works

Connect your codebase. Run a task. Get a PR.

Fei is the operating layer between your prototype and your production infrastructure - microservices, APIs, SSO, database connections - all understood automatically.

Codebase ingestion

Your real stack. Understood in under 2 minutes.

Fei plugs into your repo and models how your engineers write code - components, standards, design system, APIs, hooks, and architecture - so every task is built like your team would, not a generic AI template.
  • Connect your git provider, no manual config
  • CSS, API, SSO, DB connections - all ingested
  • Self-updating as your codebase evolves

Task Execution

Turn ideas into production-ready product updates

Fei Studio takes raw product ideas, whether from prompts, screenshots, or Figma, and turns them into codebase-aligned variants and testable implementation options before generating production-ready output.
  • Any input - PRDs, screenshot, tickets, Figma etc
  • Break ideas into structured plans based on your infra
  • Translates plans into real system changes & PRs

Production Grade

Handoff output engineering can actually review and ship

Every task produces production-ready code, a clean PR, and full specs, all built to match your codebase. No rework, no translation - just review and merge.
  • Production quality code generated to your standards
  • Clean PRs ready for engineering review
  • Full specs and change history for complete context

Inside the OS

Six capabilities, perfectly orchestrated.

Codebase Ingestion

Connects to your Git repo and automatically maps CSS conventions, API patterns, hooks & events, third-party libraries, project architecture, and rendering config — in under 2 minutes.

Task Execution

One task request triggers up to 40+ internal agent steps. Fei handles the orchestration end-to-end. Pricing is per-task - not per step, not per seat.

Triple Output Per Task

Every completed task produces a visual prototype, production-quality code written to your org's actual standards, and a full spec doc plus pull request ready for engineer review.

Agent Knowledge Hub

As your codebase evolves, Fei updates its understanding in near-real time. Agent context stays current without any manual maintenance or re-ingestion.

Self-Updating

Spot issues, apply fixes, add validations, and push features forward by resolving problems directly instead of handing off work to developers

Explorer Mode

Coming Soon

Planned connectors to Amplitude, Mixpanel, and call recordings - giving agents business-level context, not just technical context. So the AI knows why a feature matters, not just how to build it.

Compare

Prototypes are easy. Shipping is not.

Most AI tools help your Product org mock things up. Fei Studio enables Product and Design teams to build real features that engineers can review and merge - without starting from scratch.
Capability Cursor / Copilot Lovable Claude Code Fei Studio
Creating prototypes
 ~ Requires a developer ✓ ~ Requires a developer ✓
Enhancing existing screens and components
 ~ Requires a developer ✗ Greenfield only ~ Requires a developer ✓
Live preview of your changes
See what it looks like without running a dev server
 ~ Requires a developer ✓ Prototype only ~ Requires a developer ✓
Friendly UI for non-technical people
No IDE, terminal, or coding knowledge needed
 ✗ ✓ ✗ ✓
Generates with your product's look and feel
Follows your design system, fonts, colors, and patterns automatically
 ~ Manual setup ✗ ~ Manual setup ✓ Auto-ingested
Reuses your existing components
Uses your team's actual component library, not generic UI elements
 ~ Requires a developer ✗ ~ Requires a developer ✓
Production-ready code, ready for code review
Code that fits your codebase and is ready for engineers to review
 ✓ Via a developer ✗ ✓ Via a developer ✓
Handles branches, commits, and PRs automatically
In your existing codebase - no need to touch Git manually
 ~ Requires a developer ✗ ~ Requires a developer ✓
Output: code + preview + PR per task
Every task delivers all three, not just a code change
 ~ Code only ~ Prototype only ~ Code or prototype, not both ✓ All three
Agent Knowledge Hub
Shared learnings across tasks and team members
 ✗ ✗ ✗ ✓
Per-task pricing
Not per seat or per step
 ✗ Per seat ✗ Per seat ✗ Per action ✓ Per task

~ = partial or limited capability.

Ready to unleash your PDLC?

Start Free Trial
No credit card required.