SlimSnap
Turn screenshots into structured JSON your terminal coding agent can read
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slimsnap.aiAbout SlimSnap
SlimSnap turns a screenshot into JSON that a terminal-based coding agent can actually read. The gap it fills is specific: Claude Code, Aider and Codex CLI read your files, run your tests and write your code, but terminals do not accept images, so the moment you want to discuss the UI you end up typing a paragraph describing what a screenshot would show at a glance. You capture with ⌘⇧S (or Ctrl+Shift+S on Windows) by dragging a selection, or ⌘⇧L for a full scrolling page with optional autoscroll, then annotate with arrows, callouts and highlights, then copy as JSON. The export is structured rather than descriptive: every element carries its text and a bounding box in normalized 0-to-1 coordinates, built-in OCR reads every label, button and error message, and annotations export as structured intent pointing at a specific element — so the agent fixes the thing you marked instead of guessing what the red arrow meant. Long pages split into readable frames under one JSON document because a single very tall image is unreadable to AI tools anyway. Capture and OCR run entirely locally with no upload, no account and no server in the loop, and there is an optional connector that lets Claude read captures straight off the machine. The JSON schema is published on GitHub under MIT.
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Key Features
SlimSnap Pros & Cons
✅ Pros
- +Capture and OCR run locally — nothing is uploaded
- +Open schema means you can write your own exporter
- +Works anywhere text goes: terminals, SSH, CI logs, commits
⚠️ Cons
- −Pricing is not readable without a browser
- −Only useful with text-only agent interfaces
- −JSON output is verbose compared to sending an image to a vision model
Who Is SlimSnap Best For?
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