SkyCaption
CompleteA free desktop app that reads FITS, RAW and TIFF light frames and writes a ready-to-post Instagram caption straight from the embedded metadata.
Point it at a folder of FITS, RAW or TIFF light frames and it reads the target, gear, exposure, ISO/gain, total integration time and capture date straight out of the embedded metadata — then writes a clean, ready-to-edit caption. No more re-typing the same session details before every post.
Runs entirely offline — no account, no upload, no network calls at all. Free and open-source (MIT), for Windows, macOS (Apple Silicon and Intel) and Linux.
Download on GitHub — unzip and run, no installer needed. First launch will show an "unidentified developer" (macOS) or "Windows protected your PC" warning, expected for an unsigned indie build; the repo's SECURITY.md covers why and the one-time steps past it.