stratum

Code hosting for the AI engineering era.

A GitHub alternative where agents and humans ship code together.
Built on Cloudflare. Open source.

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The problem

GitHub was built as a monolithic service in 2008. When one thing breaks, everything breaks — a single incident takes down code hosting, CI, pull requests, and package registries simultaneously. Developers have started keeping track. Some are already looking for alternatives.

AI agents now write most of the code on many teams. But every agent — Claude Code, Codex, Cursor, Devin — still pushes output through the pull request model. Line-by-line human review of machine-generated code. Manual approval checkboxes for changes an evaluation engine could score in seconds. The workflow predates the tools by fifteen years.

There are dozens of tools that help agents write code. There is no platform built for what happens after the code is written — evaluation, merge, provenance, oversight. Stratum is that platform.

What Stratum does

For humans

Reliable by default A fast, reliable place to host code. Browse files, review changes, manage projects. Per-repo isolation means one repository's problem can't cascade to another.

Structured review Every change comes with evaluation data: test results, analysis scores, LLM review. Not just a green checkmark from CI.

For agents

Ephemeral workspaces Fork a repo per task, work in isolation, merge or discard. Thousands of concurrent workspaces per project.

Evaluation-gated merges Every push is automatically scored against configurable criteria before it can merge.

Policy-as-code Define auto-merge rules, evaluation requirements, and agent capabilities in a single config file.

Full provenance Every commit tracks which agent wrote it, which model, which prompt, and why.

Architecture

Stratum is built on Cloudflare Artifacts. Every repository is an independent Durable Object with its own storage — not a row in a shared database. This is why reliability is an architectural guarantee, not a monitoring dashboard. Workspaces are lightweight forks that spin up in milliseconds. Evaluation runs in Cloudflare Workers and Sandboxes. The entire platform runs at the edge.

Artifacts Git storage with per-repo isolation via Durable Objects

Workers API layer and evaluation orchestration

Sandboxes Code execution and test running

D1 Metadata and provenance tracking

AI Gateway LLM-powered evaluation

Open source, self-hosted or managed

Stratum is open source. Deploy it on your own Cloudflare account and pay only for the underlying infrastructure. Or use Stratum Cloud — coming soon — and let us handle it.