Automate Image Tagging with Synapic: Local and Efficient

Synapic tags your image catalog automatically — and keeps the work local.

Your image catalog grows faster than anyone can describe it. Synapic runs a vision-language model against each image and produces a category, keywords, and a plain-language description, then writes the results back into the catalog. No cloud API calls, no per-image manual tagging.

How it works

Synapic is two processes that talk over a local HTTP connection:

  • Avalonia UI (C#) — the wizard, the Daminion connection, the processing loop, and writing metadata back to files or the catalog.
  • Python sidecar — model loading and inference only. It never touches your filesystem except to read the image it is asked to tag.

The sidecar launches with the app, waits until the model is ready, and tags images on demand. When the app closes, the sidecar shuts down cleanly — nothing lingers in the background.

Features

  • Local models — runs on Hugging Face vision-language models (LFM2.5-VL-1.6B and similar) on your own machine. CPU or CUDA, with automatic fallback.
  • Two data sources — tag a local folder recursively, or connect directly to a Daminion server and tag items in a catalog or scope.
  • Probability scoring — tier-annotated confidence scores alongside the plain-language description, so you can trust or re-tag as needed.
  • Bulk processing — a progress view with ETA, live colorized logging, pause, abort, and per-item retry.
  • Metadata writing — EXIF/IPTC for JPEG, tEXt/iTXt for PNG and TIFF, plus direct writes back to Daminion.
  • Deduplication — perceptual hashing (pHash/dHash/aHash/color-moment) to find near-duplicates, with side-by-side comparison and bulk tag/move/delete actions.
  • Results & export — review the results grid, export to CSV, and verify writes landed in Daminion.

Platform support

Windows builds are available now. macOS and Linux are in development, planned for 2027 if there is demand. The model weights can be baked into the Windows install or downloaded on first run. A lite installer is available if you’d rather download the model yourself.

Pricing

Synapic is free during the beta, from December 1, 2026. At launch it is $9.99 per month. There is no free trial after launch; the 7-day money-back guarantee covers you from purchase, so you can evaluate it against your real catalog.

Downloads and licensing are handled through the store. Source remains available on GitHub for review and contribution.

A catalog, tagged in place.

Point Synapic at a folder or a Daminion catalog. It reads the images, writes categories, keywords and descriptions back to the files, and never uploads anything.

synapic / tag catalog local

Source

  • Archive 2024
  • — Weddings
  • — Product
  • — Scans

IMG_4821.jpg

Two people on a beach at golden hour, seen from behind.

categoryportrait

keywordsbeach, sunset

confidence0.92

Written to file · EXIF/IPTC

Interface mockup — example data, not a screenshot.

See it tag a real catalog.

Point Synapic at a folder or a Daminion catalog. It writes categories, keywords, and descriptions back to the files — on your machine, with no upload step.

$9.99 per month at launch

Free during the beta, from December 1, 2026. Windows first; macOS and Linux in development. 7-day money-back guarantee.

Questions first? claude@slashdothash.tech