Why Not Litestream?

Litestream is Awesome

Litestream is an excellent tool for SQLite replication, created by Ben Johnson. Walsync wouldn’t exist without Litestream’s pioneering work on WAL-based replication to S3. We use the same LTX file format for compatibility and are grateful for the open-source foundation that makes projects like this possible.

Use Litestream when:

• Battle-tested production stability is critical
• Your team is familiar with the Go ecosystem
• You want the most mature tooling

When Walsync Shines

Walsync was built for resource-constrained environments and Rust-native deployments.

Memory Efficiency

Walsync’s Rust implementation has a smaller memory footprint (~12 MB vs ~33 MB baseline). For resource-constrained environments (small VMs, containers, edge deployments), this difference matters.

Native Rust Integration

If you’re building in Rust, walsync provides:

• Native async/await with tokio
• No CGO dependencies
• Direct library integration (coming soon)
• Smaller binary size (~8 MB vs ~15 MB)

Multi-Tenant Architecture

For multi-tenant SQLite deployments:

# Back up all tenant databases with one process
walsync watch \
  /var/lib/app/tenant1/app.db \
  /var/lib/app/tenant2/app.db \
  /var/lib/app/tenant3/app.db \
  -b s3://backups

Read Replicas

Walsync includes built-in read replica support:

# Create a read replica that polls for updates
walsync replicate s3://bucket/mydb --local replica.db --interval 5s

The Right Tool

• Production workloads needing stability: Use Litestream
• Rust-native environments: Use walsync
• Memory-constrained deployments: Use walsync
• Built-in read replica polling: Use walsync

Both tools solve the same core problem (SQLite backup to S3) and use compatible LTX file formats. Pick the one that fits your stack.