MergeHDR vs PhotomatixCL

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.

PhotomatixCL is a command-line interface for adding HDR image processing to automated imaging workflows on Linux, macOS, and Windows. It merges exposure-bracketed photos into HDR images and processes them with tone mapping or exposure fusion. Image alignment, ghost removal, HDR presets, and JPG, TIFF, or EXR output are included. Inputs can come from a computer or local network, or be downloaded from a web server. Each run handles one bracketed set; the bundled PhotomatixCL-Driver can process folders of sets in batches. The CLI is designed for automated workflows on cloud or local servers and does not require API integration code. Linux downloads include Ubuntu, a statically linked universal build, and an ARM build for Debian; the universal build omits lens correction. Free-plan tracking requires internet access, and the CLI fails during outages unless used in trial mode. Trial runs do not use credits but add a Photomatix watermark to output images. The listed plans include free use and paid options; paid pricing is listed from $39 one-time.