# Atmosphere-NX/Atmosphere

Atmosphère is a work-in-progress customized firmware for the Nintendo Switch.

Repository: https://github.com/Atmosphere-NX/Atmosphere
Canonical: https://ross.abutalabs.com/products/atmosphere
Language: C++
License: GPL-2.0
License Family: copyleft
Last push: 2026-08-21T22:16:02+00:00

## Health v2 (maintenance only)
Score: 91/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 77, longevity 100
- inputs: {"age_days": 3149, "days_push": 12, "days_rel": 78, "gap_med": 42.0, "n_releases_24m": 11}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 19473, forks 1457 (observed 2026-08-28T04:11:28.701080+00:00)

## What it is
Atmosphère is a customized firmware (CFW) for the Nintendo Switch, composed of components that replace and patch the console's bootloader, Secure Monitor, kernel sysmodules, and OS-level code. It enables homebrew software and system modifications on the Switch's Horizon OS.

## Use cases
- run homebrew software on a Nintendo Switch
- install custom firmware on a Switch console
- boot a Switch with a modified bootloader
- use emuMMC/EmuNAND to keep a separate system environment
- patch Horizon OS system modules for extra features

## When to choose
- you want the most widely used and actively maintained Switch custom firmware
- you need EmuNAND support and deep system-level customization
- you are developing Switch homebrew that relies on CFW features

## When to avoid
- you only want to run official firmware without modifications
- you are uncomfortable with console hacking and its ban/warranty risks
- you target other consoles than the Nintendo Switch

## Facets
- artifact type: application
- maturity: active
- function: embedded, security
- domain: gaming-tools, operating-systems, hardware
- platform: embedded, cpp
- tags: nintendo-switch, custom-firmware, cfw, homebrew, horizon-os, bootloader

## Member repositories
- Atmosphere-NX/Atmosphere (main) score 91

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:28.701080+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 2026-08-29T17:00:06.351249+00:00, confidence not recorded.
  - readme: https://github.com/Atmosphere-NX/Atmosphere (fetched 2026-08-28T04:11:28.701080+00:00, sha 26dc703ed3f6)
- Data as of 2026-08-30T08:39:29.467469+00:00.