Alloy prototypes product changes against a team’s actual codebase rather than a throwaway sandbox: capture a product from the browser or connect the real repository, describe a change in chat, see it live, and push working code as a GitHub pull request. It supports model selection between Claude and ChatGPT, MCP connectors, more than 20 SaaS integrations, cloud session sharing and inline commenting for feedback. Harvey, Rewind, Amazon, Redis and Linktree are named as users. Free to start, with credit-based pricing and a bring-your-own-subscription option for an existing Claude or ChatGPT account.
Prototyping against the real product rather than a disconnected mockup is the feature that actually matters: the standard failure of AI prototyping tools is producing something that looks right and then needs a full rebuild to work against the actual codebase, and generating a real pull request against real code from the start skips that translation step entirely. Named enterprise users of the calibre listed here are a stronger trust signal than almost anything else in this catalogue – companies like Amazon do not casually attach their name to a product that does not work.
Bring-your-own-subscription for Claude or ChatGPT is a genuinely good option already covered favourably elsewhere in this catalogue for the cost transparency it gives, but it does mean a second bill alongside Alloy’s own credits. Working directly against a live codebase also raises the stakes of a bad AI-generated change reaching a pull request – review it with the same rigour as any other PR before merging.
