# airbnb/chronon

Chronon is a data platform for serving for AI/ML applications.

Repository: https://github.com/airbnb/chronon
Canonical: https://ross.abutalabs.com/products/chronon
Language: Scala
License: Apache-2.0
License Family: permissive
Topics: ai, ml
Last push: 2026-09-02T21:10:31+00:00

## Health v2 (maintenance only)
Score: 75/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 100, release rhythm 28, longevity 100
- inputs: {"age_days": 2163, "days_push": 0, "days_rel": 419, "gap_med": 54.5, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1043, forks 105 (observed 2026-09-03T02:15:08.891438+00:00)

## What it is
Chronon is an open-source data platform from Airbnb for computing, backfilling, and serving ML features. It handles batch and streaming feature computation, low-latency online serving, and point-in-time-correct training data generation with observability tooling.

## Use cases
- serve low-latency features for online ML inference
- generate point-in-time correct training datasets
- backfill historical feature values over large time windows
- compute windowed aggregations from event streams and batch tables
- monitor online/offline feature consistency and data freshness

## When to choose
- you need a feature store with guaranteed training/serving consistency
- your ML features require both batch and streaming computation
- you need scalable backfills for model training data
- you serve high-fanout feature sets at low latency

## When to avoid
- you only need simple batch ETL without online serving
- your stack is not JVM/Spark-based
- you want a fully managed SaaS feature store rather than self-hosted infrastructure

## Facets
- artifact type: framework
- maturity: active
- function: etl, streaming, monitoring, machine-learning, caching
- domain: machine-learning, big-data, artificial-intelligence
- platform: jvm, python, cloud, self-hosted
- tags: feature-store, feature-engineering, online-serving, backfills, point-in-time-correctness, scala, ml-platform, data-engineering, docker

## Member repositories
- airbnb/chronon (main) score 75

## Provenance
- Observed fields: from GitHub, fetched 2026-09-03T02:15:08.891438+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 2026-08-30T07:02:52.966923+00:00, confidence not recorded.
  - readme: https://github.com/airbnb/chronon (fetched 2026-09-03T02:15:08.891438+00:00, sha 1998f0f154e4)
- Data as of 2026-08-30T08:39:29.467469+00:00.