Raystack Stencil

At a glance

• Editor score
  8.2 / 10
• Pricing
  Open source
• Best for
  Developers wanting a lightweight open-source registry
• Paid from
  Free
• Schema formats
  Protobuf, Avro, JSON Schema
• Facts checked
  20 Sep 2026

• Where it wins

  • Supports Protobuf, Avro, and JSON Schema formats
  • Includes version history and compatibility checks
  • Provides APIs, CLI tools, and Go, Java, JavaScript, and Clojure libraries

• Where it doesn't

  • Self-hosted deployment puts installation and operations on the adopting team
  • Compatibility checking is limited to backward, forward, and full modes
  • Integration options center on APIs, the CLI, and four client libraries

Our verdict on Raystack Stencil

Raystack Stencil is an open-source schema registry for teams building event-driven applications. It stores and serves versioned schemas, checks schema evolution, validates schemas during upload, and provides retrieval and metadata APIs. Its self-hosted model suits developers who want a lightweight registry they can operate across Windows, macOS, Linux, Docker, package managers, binaries, or source. Support for Protobuf, Avro, and JSON Schema gives it a useful format range for teams working across event systems.

Stencil’s feature depth is concentrated around schema lifecycle management. Teams can maintain versioned schema history, apply backward, forward, or full compatibility checks, download descriptor files, retrieve the latest schema versions, and refresh runtime descriptors through documented strategies. REST and HTTP APIs cover management and retrieval, while the CLI supports creating, viewing, and searching schemas. Client libraries for Go, Java, JavaScript, and Clojure extend the registry into application development workflows. The open-source pricing model avoids a paid-plan structure, while self-hosting makes deployment and ongoing operation part of the adoption decision.

The main trade-off is focus. Stencil provides a defined set of compatibility modes and a developer-oriented toolchain, but its ecosystem centers on its APIs, CLI, and client libraries rather than a broad integration catalog. Teams seeking a self-managed registry with core validation, versioning, and runtime access should consider it. Teams that prefer a managed service, broader compatibility coverage, or a wider prebuilt integration ecosystem should choose an alternative designed around those requirements.

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Raystack Stencil pricing

Raystack Stencil fact sheet

Alternatives to Raystack Stencil

• ASAxonOps Schema RegistryA free, self-hosted registry with broad schema formats, compatibility modes, and Kafka ecosystem support.9.4
• AWS Glue Schema RegistryA free AWS-native registry for schema control across major streaming services.9.3
• ARApicurio RegistryBroad open-source registry coverage for teams managing APIs, events, and data contracts.9.2

See all Raystack Stencil alternatives →

Featured on iTechGuides

Raystack Stencil is listed in our Schema Registry Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update