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Unison

Bidirectional file synchronizer with conflict detection

File Sync & Storage ★ 5.4k stars Medium setup GPL-3.0

Unison is a mature bidirectional file synchronization tool that reconciles changes made independently on two replicas. It detects conflicts, preserves both versions, and works over SSH for secure remote syncing.

Key features

  • True bidirectional sync
  • Conflict detection
  • Works over SSH
  • Cross-platform replicas

Pros & cons

Strengths

  • Very reliable
  • Fine-grained control

Trade-offs

  • Dated GTK interface
  • Version matching between hosts

Unison replaces

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