Parity

Both projects share the same database and schema. What differs is the runtime.

Comparison

	9RouterX	9Router (upstream)
Runtime	Single Go binary	Node.js + Next.js
Dashboard	Embedded Svelte 5	React 19
Database	SQLite (modernc, pure Go)	SQLite
Schema	Same, additive	Same
Docker	Single binary	Node
Port	`20128`	`20128`

Guaranteed identical

Request/response schemas for /v1/* — Chat Completions, Messages, Embeddings, Audio, Models.
Dashboard endpoints /api/* — Connections, Combos, ProxyPools, Settings, ProviderNodes, Usage, Auth.
Combo expansion, model fallback, account rotation, and strike-breaker quota handling.
SQLite database compatibility (~/.9router/db/data.sqlite).

Both projects share the same database and schema, so a connection you add in either dashboard shows up in the other. The supported setup is one active writer.

What version am I running?

9routerx version

The dashboard's changelog modal shows both CHANGELOG.md and any fragment merged since the last tag, so what you read there is current even between releases.

Different by design

Internal implementation leverages Go's performance, strong typing, small memory footprint, and idiomatic concurrency — it is not a transliteration of JavaScript.
SSE streams flow directly through io.Reader/io.Writer, never buffered whole.
SQLite access: one read per page, never N+1.

Go-only features

Some features exist only in 9RouterX and do not collide with upstream: