# jamsocket/y-sweet

A realtime CRDT-based document store, backed by S3.

Repository: https://github.com/jamsocket/y-sweet
Canonical: https://ross.abutalabs.com/products/y-sweet
Homepage: https://docs.jamsocket.com/y-sweet
Language: Rust
License: NOASSERTION
License Family: other
Topics: crdt, multiplayer, yjs
Last push: 2025-12-04T19:28:33+00:00

## Health v2 (maintenance only)
Score: 58/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 55, release rhythm 48, longevity 81
- inputs: {"age_days": 1143, "days_push": 272, "days_rel": 351, "gap_med": 7, "n_releases_24m": 18}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1015, forks 84 (observed 2026-08-28T04:03:14.200989+00:00)

## What it is
Y-Sweet is an open-source realtime document store and sync backend built on the Yjs CRDT library, written in Rust. It persists documents to S3-compatible object storage, provides document-level access control via client tokens, and ships with TypeScript SDKs and React hooks for building collaborative apps.

## Use cases
- add realtime multiplayer editing to a web app
- build a collaborative document editor with Yjs
- sync CRDT documents between clients and a server
- persist collaborative document state to S3
- build a collaborative whiteboard or code editor
- self-host a realtime sync backend for Yjs

## When to choose
- you are building a Yjs-based collaborative app and need a production-ready sync and persistence backend
- you want S3-backed document persistence with horizontal scaling via session backends
- you want a Rust server with document-level access control tokens

## When to avoid
- you need a general-purpose database rather than CRDT document sync
- you want a fully managed service without self-hosting (though a managed Jamsocket/Modal option exists)
- your app does not use CRDTs or Yjs-style conflict-free merging

## Facets
- artifact type: service
- maturity: active
- function: database, websocket, auth, object-storage, http-server
- domain: web-development, databases, developer-tools
- platform: rust, self-hosted
- tags: crdt, yjs, realtime-sync, collaborative-editing, s3, multiplayer, document-store, jamsocket, real-time, linux, web-server, nodejs

## Member repositories
- jamsocket/y-sweet (main) score 58

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:14.200989+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:11:26.659957+00:00, confidence not recorded.
  - readme: https://github.com/jamsocket/y-sweet (fetched 2026-08-28T04:03:14.200989+00:00, sha fb59098ca7e4)
  - homepage: https://docs.jamsocket.com/y-sweet (fetched 2026-08-29T13:10:54.871460+00:00, sha 45242883ae69)
  - site_page: https://modal.com/docs (fetched 2026-08-29T13:10:54.876123+00:00, sha ad435e260a3a)
  - site_page: https://modal.com/docs/guide (fetched 2026-08-29T13:10:54.878106+00:00, sha 318f658a9f8c)
  - site_page: https://modal.com/docs/guide/security (fetched 2026-08-29T13:10:54.881701+00:00, sha 2226f725bbe6)
  - site_page: https://modal.com/docs/examples/llm_inference (fetched 2026-08-29T13:10:54.883531+00:00, sha 44136fa355b3)
  - site_page: https://modal.com/docs/examples/diffusers_lora_finetune (fetched 2026-08-29T13:10:54.885060+00:00, sha f1e0fac22a63)
  - site_page: https://modal.com/docs/examples/opencode_server (fetched 2026-08-29T13:10:54.887418+00:00, sha 0c858c9da497)
  - site_page: https://modal.com/pricing (fetched 2026-08-29T13:10:54.874132+00:00, sha 253494e926fc)
  - site_page: https://modal.com/company (fetched 2026-08-29T13:10:54.879999+00:00, sha 5451e007e7f9)
- Data as of 2026-08-30T08:39:29.467469+00:00.