Download on the Mac App Store
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For macOS

Caption your photo collection, with AI.

Browse folders on your Mac or choose photos from your Apple Photos Library. Create natural, detailed captions with Google Gemini, choose from four alternatives, and save the result to EXIF/IPTC metadata while preserving your originals. No Google account or API key needed: your first 25 photos are free.

Download on the Mac App StoreWatch the full walkthrough ↓

Features

Everything you need to caption your photos.

Four tools, working together — designed natively for macOS.

AI Captions

Google's Gemini analyzes each photo and creates a primary caption plus three alternatives, with scene, landmark, and available person-name context.

Photos Library Browser

Open any folder on your Mac or choose photos directly from your Apple Photos Library. Fast thumbnails, smart selection, and instant previews.

Folder Export

Captions are written directly into EXIF and IPTC metadata, then saved alongside the originals — no proprietary database, no lock-in.

Geotagged Maps

For photos with GPS data, see exactly where they were taken on an interactive map — all rendered locally on your Mac.

Highlights

Every detail, considered.

The full list of what's in the box.

Captions & AI

  • Powered by Google Gemini 3.6 Flash, with Gemini 3.8 Flash and 3.1 Pro available on your own Google key
  • One primary caption plus three alternates per photo
  • Landmark and venue recognition from visual clues and nearby places
  • Person-name embedding from IPTC metadata
  • Multiple language support for generated captions
  • On-device MobileNetV4 fallback when offline or quota-limited
  • Inline caption editor with live preview

Photos & Locations

  • Browse any folder on your Mac or import from the Photos app
  • Fast thumbnail grid with smart selection
  • Interactive map view for geotagged images
  • Nearby place names from Apple Maps, or Google Places with your own key (optional)
  • Configurable search radius and place types
  • Supports JPEG, HEIC, PNG, TIFF, and DNG/RAW formats
  • TIFF file creation for proprietary RAW files

Workflow & Export

  • Captions written directly into EXIF and IPTC metadata
  • Batch processing with progress tracking
  • Persistent SQLite cache — re-captioning is free
  • Designed for macOS 15.4 or later
  • Sandboxed, signed, and notarized for the Mac App Store

Additional Features

  • Select detailed location from the settings window
  • Choose between Modified or Original images from the Photos Library
  • Select any segment of the caption and perform a web search
  • If desired, revert to the original caption
  • Re-process any previously processed image with different settings
  • Save all or selected images
  • Image caching option to prevent re-processing the same images
  • Tracking of total number of images processed

Privacy & Pricing

  • 25 free photos, no Google account or API key needed
  • Photo packs from $4.99 that never expire — no subscription
  • Photos pass through our server to Google and are never stored
  • No analytics, telemetry or trackers in the app
  • Prefer your own Google API key? One-time $24.99 Own Key Unlock
  • API keys stored only in the macOS Keychain, never transmitted to us

Gallery

A closer look.

Watch the full walkthrough, then click any screenshot to view it full size.

Available now

Download PhotoCaptioner AI.

Free to download on the Mac App Store, with 25 free photos. Then photo packs from $4.99. No subscriptions.

Download on the Mac App Store