MergeHDR vs SNS-HDR

MergeHDR detects exposure-bracketed photos in a library and merges them into HDR images after approval. It identifies three-, five- and seven-frame groups using metadata such as capture time and exposure values. Users can select alignment and one of four deghosting levels, then switch tone-mapping presets without repeating the merge. The app reads and writes through Apple Photos; its App Store listing also says it can connect to an FTP server to merge brackets directly from a camera. Listed inputs include Canon CR3, Sony ARW, Nikon NEF, Fujifilm RAF, Olympus ORF, Panasonic RW2, DNG, Apple ProRAW, HEIC and JPEG. Merged images can be saved at full quality or compressed to HEIC. Merging and previewing are free; the first 10 exports are free, with a limit of five free exports per day. Unlimited saves cost $9.99 a year or 19.99 USD once, with Universal Purchase for iPhone, iPad and Mac. Processing runs locally and offline, according to the maker, and the stated privacy label is Data Not Collected.

SNS-HDR processes photo sequences into HDR images and can also process single images. It reads JPEG, TIFF, RAW files including DNG, OpenEXR, and Radiance HDR. For sequences, it can align source exposures and reduce ghosting and chromatic aberration. Editing tools include masks, presets, project saving and restoration, and batch processing; the software also supports 360° panorama processing. Its controls and presets are intended to produce natural-looking results. Listed outputs include JPEG, TIFF, TIFF-8, TIFF-16, SNSX, HEIC, and HEIC-10, with HEIC output available on macOS. It runs on Windows and macOS, requiring Windows 10 64-bit or newer, or macOS 14 or newer on Apple Silicon. It integrates with Adobe Lightroom Classic as a plug-in or external editor, but not cloud-based Lightroom. SNS-HDR Lite is freeware with a commercial license. Home costs €30 a month for a non-commercial license; Professional costs €85 a month for a commercial license. The Home Lightroom plug-in handles one series at a time, while Professional adds series splitting and quiet mode; batch processing is a Pro feature. A Pro demo is available to try before purchase.