# erlang/otp

Erlang/OTP

Repository: https://github.com/erlang/otp
Canonical: https://ross.abutalabs.com/products/otp
Homepage: http://erlang.org
Language: Erlang
License: Apache-2.0
License Family: permissive
Last push: 2026-08-26T17:35:24+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 84, longevity 100
- inputs: {"age_days": 6134, "days_push": 7, "days_rel": 29, "gap_med": 3, "n_releases_24m": 86}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 12333, forks 3274 (observed 2026-08-28T04:10:52.384313+00:00)

## What it is
Erlang/OTP is the Erlang programming language together with its runtime system (BEAM) and the Open Telecom Platform, a set of libraries and design principles for building massively scalable, fault-tolerant, soft real-time systems. It provides lightweight processes, message passing, hot code reloading, and battle-tested middleware components maintained by Ericsson.

## Use cases
- build highly available concurrent backend systems
- write fault-tolerant distributed applications
- develop soft real-time messaging and telecom software
- learn functional programming with lightweight processes
- run millions of lightweight concurrent processes
- build systems requiring hot code upgrades with zero downtime

## When to choose
- you need extreme concurrency and fault tolerance
- you are building messaging, telecom, or real-time backend infrastructure
- you want a mature runtime proven in production for decades
- you need distributed systems with supervision and hot code reloading

## When to avoid
- you need heavy numeric or CPU-bound computation
- your team requires a large talent pool or mainstream ecosystem
- you are building simple scripts or CLI utilities
- you need fine-grained control over memory layout or low-level performance

## Facets
- artifact type: library
- maturity: stable
- function: programming-language, concurrency, interpreter, middleware
- domain: programming-languages, microservices, backend
- platform: windows, cross-platform
- tags: erlang, otp, beam, fault-tolerance, soft-real-time, functional-programming, runtime-system, telecom, linux, macos

## Member repositories
- erlang/otp (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:52.384313+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 2026-08-29T17:14:09.238655+00:00, confidence not recorded.
  - readme: https://github.com/erlang/otp (fetched 2026-08-28T04:10:52.384313+00:00, sha f25b59d87b25)
  - homepage: http://erlang.org (fetched 2026-08-29T08:11:26.140548+00:00, sha af51eeeaf0bd)
  - site_page: https://www.erlang.org/docs (fetched 2026-08-29T08:11:26.143376+00:00, sha 3dcb78fbc064)
  - site_page: https://www.erlang.org/about (fetched 2026-08-29T08:11:26.145305+00:00, sha 78353afc1548)
  - site_page: https://www.erlang.org/doc/getting_started/intro.html (fetched 2026-08-29T08:11:26.147048+00:00, sha f05a6ae39c3f)
- Data as of 2026-08-30T08:39:29.467469+00:00.