Kafka Schema Registry vs PostHog MCP
Kafka Schema Registry is an MCP server published by aywengo. Marketplaces we read that list it: 1 (Docker MCP Catalog). PostHog MCP is a plugin bundle for AI coding tools published by Cursor. Marketplaces we read that list it: 1 (Cursor: cursor/plugins). As of our marketplace pass on 2026-10-18. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |   Kafka Schema Registry | |
|---|---|---|
| Docker MCP Catalog | Listed Version: sha256:651147289d87 Forks (GitHub): 9 Stars (GitHub): 32 Not marked · First seen |
Not listed |
| Cursor: cursor/plugins | Not listed | Listed Version: 1.0.1 Forks (GitHub): 1 197 Stars (GitHub): 12 306 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | Kafka Schema Registry | PostHog MCP |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 32 (worse) | 12 306 (better) |
| Forks (GitHub) (differs) | 9 (worse) | 1 197 (better) |
| Last release | Not published | Not published |
| Where it runs (differs) | On your machine (aywengo/kafka-schema-reg-mcp:stable) | Remote server (mcp.posthog.com/mcp) |
| Transport (differs) | stdio | Streamable HTTP |
| Tools it declares (differs) | 29 | Not published |
| Environment variables it asks for (differs) | 5, secrets among them: 2 | Not published |
| Parts of the bundle (differs) | Not a bundle | 1 |
| Licence | MIT | MIT |
| Repository (differs) | github.com/aywengo/kafka-schema-reg-mcp | github.com/cursor/plugins |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | no remote endpoint we check | Responded 3 days ago, requires a key |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
Kafka Schema Registry
Comprehensive MCP server for Kafka Schema Registry operations. Features multi-registry support, schema contexts, migration tools, OAuth authentication, and 57+ tools for complete schema management. Supports SLIM_MODE for optimal performance.
PostHog MCP
Work with PostHog from chat: query product analytics and run SQL, manage feature flags and experiments, triage error tracking issues, and review session replays, surveys, and dashboards (URL-only connector to PostHog's hosted MCP server).
How to run each
Kafka Schema Registry As a local MCP server: Docker image
claude mcp add --env "SCHEMA_REGISTRY_PASSWORD=<YOUR_SCHEMA_REGISTRY_PASSWORD>" --env "SCHEMA_REGISTRY_USER=<YOUR_SCHEMA_REGISTRY_USER>" --transport stdio kafka-schema-reg-mcp -- docker run -i --rm -e SCHEMA_REGISTRY_PASSWORD -e SCHEMA_REGISTRY_USER aywengo/kafka-schema-reg-mcp:stableRequires: SCHEMA_REGISTRY_PASSWORD (secret), SCHEMA_REGISTRY_USER (secret)
PostHog MCP
No data for an automatic command: what its marketplaces declare does not say unambiguously how to connect it.
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Only PostHog MCP has a remote endpoint we check. How we check endpoints
Tools each declares
The marketplaces of PostHog MCP publish no list of tools, so we do not compare tools.
Settings each asks for
The marketplaces of PostHog MCP publish no settings it asks for, so we do not compare settings.
What it can do: Kafka Schema Registry · What it can do: PostHog MCP · Compare two other plugins
Data comes from the Docker MCP Catalog (desktop.docker.com/mcp/catalog) and Docker Hub. Data comes from the public marketplace file https://github.com/cursor/plugins/blob/HEAD/.cursor-plugin/marketplace.json. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.