AstroFileViewer

iOS Universel / Photo et vidéo

AstroFileViewer lets you open and view astronomical image files (FITS and XISF) directly on your iPhone or iPad. Whether you receive a sub-exposure via AirDrop, download one from Safari, or browse your imaging files in the Files app 
— AstroFileViewer displays them with a proper PixInsight-compatible STF auto-stretch so you can actually see what's in your data.

Features:
• Open FITS and XISF files from Files, Safari, AirDrop, email, or any share sheet
• PixInsight-compatible Screen Transfer Function (STF) auto-stretch for proper visualization of linear astronomical data
• Supports mono and RGB images from all major astro cameras
• Pinch-to-zoom up to 10x with smooth panning
• FITS/XISF header inspector — view all keywords with important ones (Object, Filter, Exposure, Gain, Temperature) highlighted
• Save to Photos as a stretched JPEG for easy sharing on social media or forums
• Full compression support: LZ4, LZ4HC, zlib, zstd, fpack (Rice, GZIP), ByteShuffle

AstroFileViewer registers as the default handler for .xisf, .fits, .fit, and .fts files on your device. Once installed, tapping any astronomical image file automatically opens it in AstroFileViewer.

No account required. No internet connection needed. Your files stay on your device.
Built by an astrophotographer, for astrophotographers.