# bcpierce00/unison

Unison file synchronizer

Repository: https://github.com/bcpierce00/unison
Canonical: https://ross.abutalabs.com/products/bcpierce00-unison
Language: OCaml
License: GPL-3.0
License Family: copyleft
Last push: 2026-08-06T16:08:03+00:00

## Health v2 (maintenance only)
Score: 83/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 96, release rhythm 57, longevity 100
- inputs: {"age_days": 3843, "days_push": 27, "days_rel": 125, "gap_med": 177, "n_releases_24m": 4}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5455, forks 273 (observed 2026-08-28T04:09:19.042526+00:00)

## What it is
Unison is a cross-platform, bidirectional file synchronization tool that keeps two replicas of files and directories in sync across different hosts or disks. It propagates non-conflicting changes automatically, detects conflicts, and communicates over ssh or TCP with rsync-like efficient transfers.

## Use cases
- sync files between a Windows laptop and a Unix server
- two-way synchronization of directories on different machines
- keep an offline local copy of files that syncs when reconnected
- efficiently sync large files over slow network links
- automatically sync changes as they happen with repeat mode
- synchronize data over ssh without root privileges

## When to choose
- you need true two-way sync, not one-way mirroring or backup
- you work offline and need synchronized data available locally
- you cannot install kernel modules, FUSE, or use root privileges
- you want bandwidth-efficient syncing of large files over ssh
- you need a battle-tested tool with a precise specification

## When to avoid
- you only need one-way mirroring or simple backups (rsync is simpler)
- you want real-time collaborative editing of the same files
- you need a distributed filesystem with concurrent multi-client access
- you expect rapid feature development or large active support community

## Facets
- artifact type: application
- maturity: maintenance
- function: file-system, backup, cli, gui
- domain: files, developer-tools, cross-platform, self-hosted
- platform: windows, cross-platform, cli
- tags: file-synchronization, two-way-sync, rsync-alternative, ssh, offline-sync, linux, macos

## Member repositories
- bcpierce00/unison (main) score 83

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:19.042526+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 2026-08-29T17:56:48.237212+00:00, confidence not recorded.
  - readme: https://github.com/bcpierce00/unison (fetched 2026-08-28T04:09:19.042526+00:00, sha 77a4a30ce06d)
- Data as of 2026-08-30T08:39:29.467469+00:00.