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.
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 | ✓ |
| Live preview of your changes See what it looks like without running a dev server |
~ Requires a developer | ✓ | Prototype only | ✓ |
| 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.
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