Alloy
YC W23Sydney, AU · Founded 2023 · 5 employees · 5 known investors
Alloy is a cloud-based platform that enables teams to prototype and build product changes using AI by connecting their codebase or capturing pages via browser extension, then pushing production-ready code directly to GitHub. It serves product teams and developers across any company looking to accelerate product iteration without local environment setup.
Also known as Index · Alloy (alloy.app)
Founders & leadership· Y Combinator alumni (W23)
Alloy was founded in 2023 by Simon Kubica and Christian Iacullo.
Investors · 5
The YC application· Winter 2023 batch
Alumni Q&A
- How did your company get started? (i.e., How did the founders meet? How did you come up with the idea? How did you decide to be a founder?)
- The co-founders, Simon Kubica and Christian Iacullo, met in Sydney in 2016 through mutual friends. They each spent about five years at major tech companies, Christian at Canva and Simon at Atlassian, before starting their own company. Reflecting on the fragmented and difficult planning process at both companies, they built their first product, Index, followed by Alloy.
- What is the core problem you are solving? Why is this a big problem? What made you decide to work on it?
- The founders are building Alloy, an AI prototyping tool aimed at professional product managers and teams rather than hobbyists, generating prototypes that match a company's existing product. They recently launched a website cloner that lets users start from their existing UI instead of rebuilding it.
Summarized from the founders' answers on their Y Combinator profile.
Company profile
researched Aug 2026Alloy is a cloud-based AI prototyping platform aimed at product managers and product teams. Users start from their existing product either by installing a Chromium browser extension that captures live pages, components, and design system details in one click, or by connecting their codebase, which requires admin permissions and roughly 15 minutes of setup. Alloy then runs the application in a sandbox so users can prompt changes through a chat interface and preview the result live in the browser.
Every session lives in the cloud and can be shared by link or email invitation with teammates, stakeholders, and customers, with inline comments pinned to specific elements and pages for contextual feedback. Sessions can be started from Slack, run in parallel, exported, accessed via MCP, or converted into a GitHub Pull Request so that changes built on the customer's own codebase can be shipped without a separate developer handoff. Alloy states it connects to more than 20 integrations for pulling in ideas, insights, and customer requests, and offers export to Figma (though Figma import is not yet supported).
The product is distributed as a web app, macOS and Windows desktop clients, native iOS and Android apps, and a Chrome Web Store browser extension. The website positions the platform as enterprise-ready and describes security as an engineering standard rather than a badge list, without detailing specific certifications.
Business model
Self-serve and sales-assisted SaaS: the site offers both a free start ("Start for free") and a booked demo/onboarding path, with an enterprise-oriented positioning. Usage of AI models is metered via Alloy credits, with an option to bring your own Claude or ChatGPT subscription so supported model prompts run on the user's existing plan instead of consuming Alloy credits.
The sources reference Alloy credits consumed by agent prompts and a free entry tier, but no pricing figures or plan details are disclosed.
Traction
The website claims usage by product leaders at top companies and lists over 20 integrations, but no customer counts, revenue, or usage metrics are disclosed in the sources.
Latest developments
The website's feature launch log lists model selection (2026-07-20), inline comments pinned to specific prototype elements (2026-07-28), MCP connectors for SaaS tools and remote MCP servers (2026-08-13), and bring-your-own Claude or ChatGPT subscription for powering sessions (2026-08-13). Figma import is described as in progress but not yet available.
▸Full profile — market position, technology, go-to-market, geography, risks & controversies
Market position
Positioned in the AI prototyping and app-builder category, competing with coding agents such as Claude Code and with generic AI app builders, differentiated by working from an existing production codebase and design system.
Alloy's stated differentiation is starting from the customer's real product rather than screenshots, so generated output matches the existing component library and design system, and producing production code that can be pushed to a Pull Request instead of throwaway mockups. Versus Claude Code, Alloy emphasizes that non-developers can start cloud sessions without a local development environment, launch sessions from Slack, run them in parallel, and share them with teammates or customers.
Technology
Alloy captures a product's pages, components, and design system via a Chromium-only browser extension, or ingests the customer's codebase and runs the application in a cloud sandbox. An AI agent applies prompted changes and generates production code that can be raised as a GitHub Pull Request. Users can select among models per prompt to trade off cost, speed, and intelligence, and can connect the agent to SaaS tools through authorized providers or any compatible remote MCP server. Outputs can be exported, accessed via MCP, or exported to Figma.
Go-to-market
Product-led entry through a free sign-up and a zero-setup Chrome extension, complemented by demo requests and onboarding sessions booked with the team. Documentation and a guide site support self-onboarding, and deeper adoption comes from connecting the customer's codebase and GitHub.
Product managers and product teams, plus developers and designers at companies that want to prototype and ship changes to an existing web product; the site claims use by product leaders at top companies and describes enterprise-scale requirements.
Geography
Not established by the sources; the product is delivered as a cloud service with web, desktop (macOS, Windows), and mobile (iOS, Android) clients.
Risks & controversies
The sources disclose no funding, financial, or customer metrics, and security claims are asserted without named certifications. Product limitations noted on the site include browser-extension compatibility restricted to Chromium-based browsers and the absence of Figma import. Multiple unrelated companies operate under the Alloy name, creating identification ambiguity.
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Images
Competitors · 4
by search overlap
Companies competing with Alloy for the same Google search keywords, organic and paid, via search-intersection analysis.
Timeline · 4
launches, deals, and filingsUsers can connect an existing Claude or ChatGPT subscription so prompts on supported models run through that plan instead of consuming Alloy credits.
Users can connect the Alloy agent to SaaS tools by authorizing a provider or adding any compatible remote MCP server, then use its tools across sessions.
Feedback can be pinned to a specific element and page of an Alloy prototype so comments stay in context.
Alloy added the ability to choose which model is used for each agent prompt, comparing cost, speed, and intelligence.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
In the news
Foundation Alloy raises USD 22M for alloy technology - Stainless Steel Worldstainless-steel-world.net · Jul 2026▸Research sources · 8
primary sources listed
- Alloyalloy.app · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Alloy do?
- Alloy is an AI prototyping tool that lets product teams build and share changes to their real product in the cloud.
- Who founded Alloy?
- Alloy was founded by Simon Kubica, Christian Iacullo in 2023.
- Who are Alloy's investors?
- Alloy's investors include Blackbird Ventures, Y Combinator, Bain Capital Ventures, BOND, Bond Capital Management.
- Where is Alloy headquartered?
- Alloy is headquartered in Sydney, AU.