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.

Explore features ↓

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 (free tier) or Gemini 3.1 Pro (with billing) for state-of-the-art image understanding
One primary caption plus three alternates per photo
Landmark recognition with Google Search grounding
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
GPS-verified nearby place lookups via Google Places API (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
          Bring your own Google API key — you control your usage
API keys stored only in the macOS Keychain, never transmitted to us
Zero analytics, zero telemetry, zero trackers
Photos never touch our servers — we don't operate any
25-photo free tier, no account required
Limited-time $14.99 Pro Unlock (reg. $24.99) — no subscription
All future updates included with Pro Unlock

        

Gallery

A closer look.

Click any image to view it full size.

Available now

Download PhotoCaptioner AI.

Free to download on the Mac App Store. One-time Pro Unlock, no subscriptions.