Runtime (P26) is part ofY CombinatorLearn more
For Product Managers

From PRD to working prototype in one session.

Hand a PRD to a coding agent, iterate on the live prototype, and pass engineering a clean pull request when it works.

Start Building Free
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Works with your favorite coding agents

Claude CodeClaude CodeCodexCodexGemini CLIGemini CLI
#engineering

Agent runs in the background and auto-pauses on completion.

Mission Control
Fix login timeout
#engineering
Update API docs
LinearENG-89
Add rate limiting
Runtimeruntm.com
agent-1 writing lib/auth.ts...

Sound familiar?

The backlog sets your roadmap

You ship what engineering had bandwidth for, not what the data said to prioritize.

You cannot iterate on a Figma frame

Static mockups hide the real copy, flow, and edge case decisions until engineering has built the wrong thing.

Writing a PRD is not the same as shipping one

You spec the work, hand it off, and wait a sprint to see anything testable.

What Runtime gives product teams

PRD to prototype in one session

Drop a PRD, Loom, or Linear ticket into Runtime, and the agent ships a clickable prototype in your repo against your real schema.

Live preview as the agent works

Every change renders in a live URL you can click around and share before an engineer touches the code.

Iterate by prompting

Talk to the agent in plain English to tweak copy, swap a component, or wire up an endpoint, and see the result in seconds.

Hand engineering a clean pull request

When the prototype feels right, open a pull request from the sandbox so engineering reviews real diffs, not a Figma frame.

Wires into Linear, GitHub Issues, and Notion

Trigger agents from a Linear ticket, GitHub issue, or Notion doc, and the resulting pull request links back to the spec automatically.

Never touches production

Every prototype runs in an isolated sandbox with scoped credentials, so product can move fast without risking customer data.

Works with your planning tools.

Linear logoLinear
GitHub logoGitHub
Notion logoNotion
Slack logoSlack
Figma logoFigma

Ticket to pull request.

01

PM assigns a Linear ticket. Build a checkout upsell modal that uses the same design tokens as the pricing page.

02

Agent opens a sandbox. Agent clones the repo, stubs the modal, and posts a preview URL back to the ticket.

03

Product iterates in the preview. PM tweaks the copy and shrinks the dismiss button by prompting in the same thread.

04

Pull request handed to engineering. When the flow looks right, the agent opens a PR linked back to the Linear ticket for engineering to review.

Frequently asked questions

Does product need to know how to code to use Runtime?
No. You prompt the agent in plain English, and the live preview shows you exactly what it built. The pull request goes to engineering for the final review and merge.
Will the prototype use our real components and design system?
Yes. The agent works inside your own repo, so it pulls from the same components, hooks, and tokens your engineers already maintain.
How do we keep these prototypes from ending up in production by accident?
Every sandbox is isolated and only ships code through a pull request. Nothing reaches your main branch until your usual review process approves it.
What if the agent gets the design wrong?
You prompt it again with the correction. Each iteration renders in the live preview within seconds, so you can refine the work without writing a single spec revision.
Can I share the live preview with stakeholders?
Yes. Every sandbox gets a sharable URL you can drop into Slack, Notion, or a Linear comment for async feedback before engineering picks it up.
Does Runtime replace engineering?
No. It removes the mechanical work of turning a PRD into a first draft, so engineering can focus on the hard parts of the build, the review, and the systems work behind it.

Get from PRD to a working prototype today

Connect Linear, point an agent at your next ticket, and ship a clickable prototype before lunch. No credit card required.

Start Building Free
Talk to the team