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Software · Photo & graphics

Tenmon

FITS/XISF image viewer, converter, index and search.

  • Completely free
  • Windows, macOS and Linux
  • Open source

Overview

Tenmon is an image viewer, available on Windows, macOS and Linux.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “FITS/XISF image viewer, converter, index and search” — Flathub, 10 November 2026
  • “Image statistics mean, media, min, max” — Flathub, 10 November 2026

At a glance

Tenmon is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (GPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • Commercial use allowed

About

It is intended primarily for viewing astro photos and images. It supports the following formats: FITS 8, 16, 32 bit integer and 32, 64 bit float XISF 8, 16, 32 bit integer and 32, 64 bit float RAW CR2/CR3, DNG, NEF JPEG, PNG, BMP, GIF, PBM, PGM, PPM and SVG images Features of application: Using same stretch function as PixInsight OpenGL accelerated drawing Index and search FITS XISF header data Quick mark images and then copy/move marked files Convert FITS <-> XISF Convert FITS/XISF -> JPEG/PNG Image statistics mean, media, min, max Support for WCS Thumbnails Convert CFA images to colour - debayer Color space aware Histogram Scripting Plate solving

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Official plan pages (pricing, licence, terms) (commercial use) —
  • Facts collected from Unspecified source (platforms) —
  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Last technical check: 8 November 2026
  • Description from Flathub — AppStream (Flathub)

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