Mantle is an open-source service runtime and WebMCP-native Builder that turns business rules into typed schemas, views, procedures, and HTTP/MCP triggers. Design and verify a service in the browser, then hand it to a coding agent to materialize, verify, and deploy to your own Cloudflare account. The OSS, Builder, and first-class Cloudflare deployment path are live now. Mantle Cloud remains in Internal Beta with a waitlist.
We built Mantle to give people and coding agents a shared, inspectable way to describe a service before turning it into production code.
The open-source core models a service with four atoms: Schema, View, Procedure, and Trigger. In the WebMCP-native Builder, an agent can read Mantle's pinned grammar, create or patch a Manifest, seed sandbox data, call projected HTTP/MCP capabilities, and inspect the result in the generated Admin UI. The handoff is for a coder or coding agent to add the product-specific frontend, authentication, integrations, tests, and deployment.
The Transaction preset in our launch images demonstrates product, inventory, order, and fulfilment workflows. It does not include payment processing and is not a finished e-commerce product.
GPT-6 Astra built the entire mantle.tools homepage and Mantle Cloud SaaS experience. The Mantle core SDK, Admin UI, and Developer UI were initially implemented with GPT-5.6 Sol; Astra then consolidated, optimized, and reviewed that work, including the launch experience. We did not bolt on an artificial Astra runtime dependency: Mantle remains model-agnostic, while this challenge demonstrates Astra working through WebMCP against a real service grammar and executable preview.
The OSS and Builder are available today. Mantle Cloud remains in Internal Beta and currently requires joining the waitlist. Feedback on the Manifest model, Builder workflow, and handoff to production code is very welcome.
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About Mantle on Product Hunt
“Describe your logic. Generate Admin UI, MCP & WebMCP.”
Mantle launched on Product Hunt on September 18th, 2026 and earned 58 upvotes and 1 comments, placing #64 on the daily leaderboard. Mantle is an open-source service runtime and WebMCP-native Builder that turns business rules into typed schemas, views, procedures, and HTTP/MCP triggers. Design and verify a service in the browser, then hand it to a coding agent to materialize, verify, and deploy to your own Cloudflare account. The OSS, Builder, and first-class Cloudflare deployment path are live now. Mantle Cloud remains in Internal Beta with a waitlist.
Mantle was featured in Open Source (68.9k followers), Developer Tools (519.8k followers), Artificial Intelligence (479.1k followers), GitHub (41.4k followers) and OpenAI Day (39 followers) on Product Hunt. Together, these topics include over 253.8k products, making this a competitive space to launch in.
Who hunted Mantle?
Mantle was hunted by Peng-Han Su. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Mantle stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Peng-Han Su