# oatpp/oatpp

🌱Light and powerful C++ web framework for highly scalable and resource-efficient web application. It's zero-dependency and easy-portable.

Repository: https://github.com/oatpp/oatpp
Canonical: https://ross.abutalabs.com/products/oatpp
Homepage: https://oatpp.io/
Language: C++
License: Apache-2.0
License Family: permissive
Topics: c-plus-plus, webframework, webserver, zero-dependency, oatpp, cpp, microservices, cross-platform, iot
Last push: 2025-11-12T06:19:27+00:00

## Health v2 (maintenance only)
Score: 46/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 51, release rhythm 8, longevity 100
- inputs: {"age_days": 3096, "days_push": 294, "days_rel": 640, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 8646, forks 1359 (observed 2026-08-28T04:10:23.983646+00:00)

## What it is
Oat++ is a light, zero-dependency C++ web framework for building highly scalable and resource-efficient web applications and REST APIs. It includes an ORM, WebSocket support, DTO object mapping, dependency injection, and automatic Swagger-UI/OpenAPI documentation.

## Use cases
- build rest apis in c++
- create a high-performance web server in cpp
- build microservices in c++
- serve websockets with millions of concurrent connections
- run a web api on embedded or iot devices
- access sqlite or postgresql via an orm in c++
- auto-generate swagger docs for a c++ api

## When to choose
- you need a production-grade C++ web framework with zero external dependencies
- you need extreme scalability and a small memory footprint (IoT, robotics, embedded)
- you want built-in ORM, DTO serialization, and Swagger-UI in one framework
- you need to handle very large numbers of concurrent WebSocket connections

## When to avoid
- your project is not in C++
- you prefer a minimal HTTP library and will assemble your own stack
- you need a framework with a very large ecosystem and frequent releases
- you want a batteries-included framework with first-party database drivers for every database

## Facets
- artifact type: framework
- maturity: active
- function: web-framework, http-server, orm, websocket, serialization, api-framework, routing, middleware
- domain: web-development, backend, apis, iot, microservices
- platform: cpp, cross-platform, windows, embedded, iot
- tags: zero-dependency, rest-api, swagger-ui, openapi, high-performance, object-mapping, dependency-injection, async-api, linux, macos

## Member repositories
- oatpp/oatpp (main) score 46

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:23.983646+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 2026-08-29T17:25:40.971768+00:00, confidence not recorded.
  - readme: https://github.com/oatpp/oatpp (fetched 2026-08-28T04:10:23.983646+00:00, sha 221e42e596bb)
  - homepage: https://oatpp.io/ (fetched 2026-08-29T08:26:15.874008+00:00, sha d7c907c6c5f2)
  - site_page: https://oatpp.io/docs/start (fetched 2026-08-29T08:26:15.883134+00:00, sha 6ef76de83372)
  - site_page: https://oatpp.io/about (fetched 2026-08-29T08:26:15.885419+00:00, sha 52db897c079f)
  - site_page: https://oatpp.io/docs/start/high-level-overview (fetched 2026-08-29T08:26:15.887354+00:00, sha d7a7c9e343ed)
  - site_page: https://oatpp.io/docs/components/orm (fetched 2026-08-29T08:26:15.889663+00:00, sha c87e890c91e1)
  - site_page: https://oatpp.io/docs/components/dto (fetched 2026-08-29T08:26:15.891714+00:00, sha 23d26ba1be40)
  - site_page: https://oatpp.io/docs/components/api-controller (fetched 2026-08-29T08:26:15.893588+00:00, sha d327b75dd1cc)
- Data as of 2026-08-30T08:39:29.467469+00:00.