# NEventStore/NEventStore

A persistence agnostic Event Store for .NET

Repository: https://github.com/NEventStore/NEventStore
Canonical: https://ross.abutalabs.com/products/neventstore
Homepage: http://neventstore.org
Language: C#
License: MIT
License Family: permissive
Last push: 2026-07-22T17:33:50+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 93, release rhythm 89, longevity 100
- inputs: {"age_days": 5914, "days_push": 42, "days_rel": 79, "gap_med": 6, "n_releases_24m": 6}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1615, forks 315 (observed 2026-08-28T04:05:11.539863+00:00)

## What it is
NEventStore is a persistence-agnostic event store library for .NET that abstracts different storage implementations behind a common API. It is designed for event sourcing in DDD and CQRS applications and supports JSON, BSON, and MessagePack serialization.

## Use cases
- implement event sourcing in a .NET application
- build a CQRS application with domain events
- swap storage backends for an event store without changing application code
- persist aggregate event streams in a DDD application
- serialize events to JSON, BSON, or MessagePack
- poll for new events from an event store

## When to choose
- you are building a .NET DDD/CQRS application with event sourcing
- you want a storage-agnostic event store abstraction with pluggable persistence providers
- you need a mature, MIT-licensed event sourcing library for .NET Standard or .NET Framework

## When to avoid
- you need a general-purpose message or stream store rather than event sourcing persistence
- you are not on the .NET platform
- you need a hosted event store with built-in projections and subscriptions

## Facets
- artifact type: library
- maturity: active
- function: database, serialization, orm
- domain: backend, databases, developer-tools
- platform: dotnet, cross-platform
- tags: event-sourcing, cqrs, ddd, event-store, persistence-agnostic

## Member repositories
- NEventStore/NEventStore (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:11.539863+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 2026-08-30T03:50:16.349081+00:00, confidence not recorded.
  - readme: https://github.com/NEventStore/NEventStore (fetched 2026-08-28T04:05:11.539863+00:00, sha 05f1e754da3b)
  - homepage: http://neventstore.org (fetched 2026-08-29T11:22:28.025626+00:00, sha 5a4c4a16abf4)
- Data as of 2026-08-30T08:39:29.467469+00:00.