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SPECIFICTION
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MergeHDR

mergehdr.app

From $0.83/mo Free plan macOSiOS
Visit mergehdr.app
Spec score 7.7 #12 of 21 in HDR Software

What it is

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.

Spec sheet

Purpose
MergeHDR detects exposure-bracketed photos in a library and merges them into HDR images after the user approves.Read 7 Oct 2026 · mergehdr.app
Privacy
The maker says photo detection and processing run locally, with no account, app analytics or uploads; its stated App Store privacy label is Data Not Collected.Read 7 Oct 2026 · mergehdr.app
Support
The support page invites users to email sample bracket files and camera details to troubleshoot merges or request support for additional RAW formats.Read 7 Oct 2026 · mergehdr.app
Bracket detection
It identifies 3-, 5- and 7-frame brackets using photo metadata such as capture time and exposure values.Read 7 Oct 2026 · mergehdr.app
Export
Merged images can be saved at full quality or compressed to HEIC using the on-device pipeline shared with RAWtoHEIC.Read 7 Oct 2026 · mergehdr.app
Free tier limit
The App Store listing says merging and previewing are free, with the first 10 exports free and a limit of 5 free exports per day.Read 7 Oct 2026 · apps.apple.com
Integration
MergeHDR reads and writes through Apple Photos, and its App Store listing says it can connect to an FTP server to merge brackets directly from a camera.Read 7 Oct 2026 · apps.apple.com
Merge controls
Users can choose alignment, one of four deghosting levels, and tone-mapping presets that can be switched without re-merging.Read 7 Oct 2026 · mergehdr.app
Offline use
The privacy page says processing works fully offline and does not require a network connection.Read 7 Oct 2026 · mergehdr.app
Originals
The app does not delete originals by default; if users choose to remove them, they go to Photos Recently Deleted for 30 days.Read 7 Oct 2026 · mergehdr.app
Requirements
The download page requires iOS 18 or iPadOS 18 for iPhone and iPad, and macOS 15 or later for Mac.Read 7 Oct 2026 · mergehdr.app
Supported formats
The download page lists Canon CR3, Sony ARW, Nikon NEF, Fujifilm RAF, Olympus ORF, Panasonic RW2, DNG, Apple ProRAW, HEIC and JPEG.Read 7 Oct 2026 · mergehdr.app

Plans and prices

Free Free Free to try Merge and preview; first 10 exports free, up to 5 per day Read 7 Oct 2026 · apps.apple.com
Yearly $9.99 a year $9.99/year, auto-renews Unlimited saves; Universal Purchase for iPhone, iPad and Mac; Family Sharing Read 7 Oct 2026 · mergehdr.app
Lifetime $19.99, paid once $19.99 once Unlimited saves; Universal Purchase for iPhone, iPad and Mac; Family Sharing Read 7 Oct 2026 · mergehdr.app

Every MergeHDR plan and price →

Strong points and limits

Strong points

  • Detects three-, five- and seven-frame brackets.
  • Offers four deghosting levels and multiple tone presets.
  • Supports a range of RAW formats.
  • Processes locally and works offline.
  • Paid plans include unlimited saves.

Limits

  • Free exports are limited to five per day.
  • Only the first 10 exports are free.
  • Requires iOS 18, iPadOS 18 or macOS 15.

Who it suits

MergeHDR suits iPhone, iPad and Mac users who want to find and merge exposure brackets from a photo library. Its free merge and preview tier lets users try the workflow, with export limits to note.

Verdict

MergeHDR pairs bracket detection with user-selectable merge controls and local offline processing. Free merging and previewing are available, while unlimited saves cost $9.99 a year or 19.99 USD once.

Where Specifiction places it

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