# armon/bloomd

C network daemon for bloom filters

Repository: https://github.com/armon/bloomd
Canonical: https://ross.abutalabs.com/products/bloomd
Homepage: http://armon.github.io/bloomd
Language: C
License: NOASSERTION
License Family: other
Last push: 2023-02-14T17:50:05+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5317, "days_push": 1296, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1248, forks 109 (observed 2026-08-28T04:04:07.811675+00:00)

## What it is
Bloomd is a high-performance C network daemon that exposes bloom filters and operations over them to clients via a simple, memcached-like ASCII protocol. It supports scalable bloom filters, disk persistence with asynchronous flushes, and automatic faulting of cold filters out of memory.

## Use cases
- run a networked bloom filter service for set membership checks
- check if a URL or item was seen before with low memory usage
- deduplicate millions of items with a small false-positive rate
- share probabilistic sets across multiple application servers
- build a cheap pre-filter in front of a database or cache

## When to choose
- you need bloom filters accessible from many languages over a simple text protocol
- memory efficiency matters more than exact answers
- you want a standalone daemon similar in spirit to memcached

## When to avoid
- you need exact set membership with zero false positives
- you want an embedded in-process library rather than a network service
- you need active development, modern tooling, or guaranteed long-term support

## Facets
- artifact type: service
- maturity: maintenance
- function: database, http-server, caching
- domain: databases, backend, developer-tools
- platform: c, self-hosted
- tags: bloom-filter, ascii-protocol, probabilistic-data-structures, memcached-like, network-daemon, sketching, linux, macos

## Member repositories
- armon/bloomd (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:07.811675+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 2026-08-30T05:07:50.942308+00:00, confidence not recorded.
  - readme: https://github.com/armon/bloomd (fetched 2026-08-28T04:04:07.811675+00:00, sha 9b32910938e5)
  - homepage: http://armon.github.io/bloomd (fetched 2026-08-29T12:18:47.484174+00:00, sha 83d56b72f886)
- Data as of 2026-08-30T08:39:29.467469+00:00.