# mycelial/mycelite

Mycelite is a SQLite extension that allows you to synchronize changes from one instance of SQLite to another.

Repository: https://github.com/mycelial/mycelite
Canonical: https://ross.abutalabs.com/products/mycelite
Homepage: https://mycelial.com
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: sqlite3, sqlite3-extension, database-replication, replication
Last push: 2023-09-25T11:26:31+00:00

## Health v2 (maintenance only)
Score: 22/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 97
- inputs: {"age_days": 1370, "days_push": 1073, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1095, forks 17 (observed 2026-08-28T04:03:34.233776+00:00)

## What it is
Mycelite is a SQLite extension (implemented as a VFS proxy in Rust) that performs physical, single-writer replication by intercepting page writes, creating binary diffs, and applying them to a replica for a bit-perfect copy. It supports sending diffs over the network and time-travel recovery to previous timestamps.

## Use cases
- replicate a SQLite database to another machine
- keep a local-first app's SQLite data in sync
- create a bit-perfect backup copy of SQLite with point-in-time recovery
- sync SQLite databases over unreliable networks at the edge
- set up read replicas for a single-writer SQLite database

## When to choose
- you need physical (bit-perfect) SQLite replication with low overhead
- you want point-in-time recovery / time travel for a SQLite database
- you're building local-first apps that sync SQLite data
- replicas must match the primary exactly, including object order

## When to avoid
- you need multiple concurrent writers (only single-writer is supported)
- your database uses WAL mode (not supported)
- you need logical replication with filtering or transformation of changes
- you frequently run VACUUM, which produces large journal entries

## Facets
- artifact type: library
- maturity: maintenance
- function: database, database-driver, streaming
- domain: databases, microservices, developer-tools
- platform: cross-platform, rust, cpp, python, go
- tags: sqlite-extension, physical-replication, vfs, local-first, edge-computing, single-writer, data-engineering, nodejs

## Member repositories
- mycelial/mycelite (main) score 22

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:34.233776+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 2026-08-30T06:47:16.672442+00:00, confidence not recorded.
  - readme: https://github.com/mycelial/mycelite (fetched 2026-08-28T04:03:34.233776+00:00, sha 2999b9b921ae)
  - homepage: https://mycelial.com (fetched 2026-08-29T12:50:15.091897+00:00, sha 3b02687889bc)
- Data as of 2026-08-30T08:39:29.467469+00:00.