# drewmccormack/ensembles

A synchronization framework for Core Data.

Repository: https://github.com/drewmccormack/ensembles
Canonical: https://ross.abutalabs.com/products/ensembles
Language: Objective-C
License: MIT
License Family: permissive
Last push: 2026-08-05T12:06:30+00:00

## Health v2 (maintenance only)
Score: 75/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 96, release rhythm 35, longevity 100
- inputs: {"age_days": 4739, "days_push": 28, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1627, forks 128 (observed 2026-08-28T04:05:13.104911+00:00)

## What it is
Ensembles is a local-first synchronization framework that extends Apple's Core Data to sync SQLite persistent stores across macOS and iOS devices via file-sync services like iCloud and Dropbox, or peer-to-peer connections, without a dedicated server. This Objective-C version is deprecated in favor of the Swift rewrite Ensembles 3.

## Use cases
- sync core data between ios and mac devices
- offline-first app with core data sync
- sync core data via icloud or dropbox without a server
- peer-to-peer core data synchronization
- keep local sqlite database in sync across apple devices

## When to choose
- you have a legacy Objective-C Core Data app needing device-to-device sync
- you want local-first sync with no server infrastructure
- you sync via file-based backends like iCloud or Dropbox

## When to avoid
- starting a new Swift project - use Ensembles 3 instead
- you need SwiftData support
- you need end-to-end encryption or modern backends like S3 or WebDAV

## Facets
- artifact type: framework
- maturity: maintenance
- function: backup, database, file-system
- domain: mobile-development, databases, cross-platform
- platform: cpp
- tags: core-data, local-first, objective-c, icloud, dropbox, offline-sync, sqlite, deprecated, ios, macos, swift

## Member repositories
- drewmccormack/ensembles (main) score 75

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:13.104911+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 2026-08-30T03:48:24.064918+00:00, confidence not recorded.
  - readme: https://github.com/drewmccormack/ensembles (fetched 2026-08-28T04:05:13.104911+00:00, sha 023679c442b9)
- Data as of 2026-08-30T08:39:29.467469+00:00.