nomacs/nomacs
nomacs is a free image viewer for windows, linux, and mac systems. observed · 2026-08-28
Health v2 · maintenance only
91/100
- Activity 99
- Release rhythm 75
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 119.5
- age_days: 4746
- days_rel: 7
- days_push: 7
- n_releases_24m: 3
Adoption not part of the score
3135 stars · 200 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
nomacs is a free, open-source image viewer for Windows, Linux, macOS, FreeBSD, and other platforms, built with Qt and optionally OpenCV. It supports common image formats including RAW and PSD, offers basic editing, metadata display, thumbnails, and synchronized multi-instance viewing for image comparison.
Use cases
- view raw camera files like cr2 and nef
- open psd and avif images on linux
- compare two images side by side with synced zoom and pan
- browse a folder of photos with thumbnails and filters
- adjust brightness, contrast, and color of a photo
- view image metadata and histograms
- view images inside zip archives
When to choose
- you need a fast, free image viewer across Windows, Linux, and macOS
- you need RAW, PSD, AVIF, HEIF, or JPEG XL support
- you want to compare images via synchronized viewers
- you prefer open-source software free for commercial use
When to avoid
- you need advanced photo editing like layers or retouching
- you need a lightweight CLI-only tool
- you require non-GPL licensing for redistribution
Facets
application · maturity stable
image-processing gui image-processing photography cross-platform desktop-applications windows cross-platform image-viewer raw-images psd avif jpeg-xl qt metadata viewer-synchronization thumbnails photo-editor linux macos desktop
5 sources
- readme: https://github.com/nomacs/nomacs · fetched 2026-08-28 · 48584001aeab
- homepage: https://nomacs.org/ · fetched 2026-08-29 · 3dbc8151c1b7
- site_page: https://nomacs.org/docs/getting-started/introduction · fetched 2026-08-29 · 6c5293d21271
- site_page: https://nomacs.org/docs/documentation/features · fetched 2026-08-29 · 2bbebd387074
- site_page: https://nomacs.org/docs/contributing/code-of-conduct · fetched 2026-08-29 · 5264f53bd8b8
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| nomacs/nomacs | main | 91 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem