px0

px0 is an open-source toolkit designed to provide prompt infrastructure for managing and governing prompts in production environments. It addresses the challenge of hardcoded prompts by enabling users to treat prompts as code, allowing for version control, instant updates, and governance without the need to redeploy applications when prompts change.

The platform offers a prompt registry where prompt templates are stored and versioned, eliminating the need for scattered strings in codebases. Templates can be written with variables, conditionals, loops, filters, and macros, supporting sandboxed rendering to ensure safe execution. px0 enables atomic versioning, where published template versions are immutable and go-live is atomic, allowing for instant rollbacks to previous versions in a single operation. The toolkit also provides a draft, review, and publish workflow, including visual diffs between any two versions and comprehensive change tracking for all edits and revisions.

px0 features team-level role-based access control (RBAC), allowing granular definition of permissions for viewing, editing, drafting, or publishing prompt templates. Observability is integrated through OpenTelemetry (OTEL) compatibility, so every prompt render can be traced and measured, with latency, performance, and error metrics pushed to OTEL-compatible backends.

The service can be self-hosted in a user's own cloud, VPC, or on-premises environment, ensuring absolute ownership of templates, data, and access controls for compliance needs. js, and Go, offering a consistent API for rendering prompts across these languages.