Logo of SlimSnap

SlimSnap

Turn a screenshot into JSON your CLI agent can read

Visit slimsnap.ai

What SlimSnap does

SlimSnap is a free screenshot app for Mac and Windows. Every capture saves the image plus a JSON file with each piece of text on screen, its position and color, and any arrows or boxes you drew, linked to the element they point at.

Coding agents like Claude Code, Codex and Cursor read screenshots as downscaled images, so small text gets blurry and the agent guesses which button you meant. With SlimSnap the agent gets the exact text and coordinates instead, and the same screen costs far fewer tokens than the image.

What it does:

• Region, window and scrolling capture, for pages and chats longer than the screen

• Annotate with arrows, boxes, highlights and text

• Copy as PNG, as JSON, or both

• MCP connector for Claude Code, Claude Desktop and Cursor, so the agent fetches your latest capture itself

• Works offline, nothing uploaded

Free, no account, signed for Mac and Windows.

SlimSnap pricing

SlimSnap has a free version, and some features or usage are paid. Uneed does not list exact prices yet: see the current prices on slimsnap.ai.

What users say 2

2 reviews

An average shows from 3 ratings.

Used SlimSnap? Add your voice.

  • Alex Bickov replied to every review so far.
  • A star rating is enough. A few words help even more.
shawkat.dev-8d59SpinHire
Join shawkat.dev-8d59 and 1 other
shawkat.dev-8d59's avatar

shawkat.dev-8d59

Oct 31, 2026

Turning screenshots into JSON for coding agents sounds useful. Does SlimSnap preserve layout coordinates, text, and component relationships so agents can identify UI issues without processing the original image?

Alex Bickov's avatar
Alex BickovMaker

Yes for coordinates and text. Every element comes with its text, a bounding box and a color, and your marks (arrows, boxes) are linked to the element they point at. It's a flat list though, no parent/child tree, so component relationships are inferred from positions. The agent can work from the JSON alone for text and layout, the image is there if it needs to look closer.

SpinHire's avatar

SpinHire

Oct 30, 2026

The tagline says screenshot into JSON for a CLI agent, but the description reads like an image compressor, so I wasn't sure which one I'd get. The first one is the interesting part for us: an agent checks our pages at desktop and phone width before anything ships, and full screenshots eat most of its context. What ends up in the JSON, layout boxes and text, or a note on what looks broken?

Alex Bickov's avatar
Alex BickovMaker

The description is fixed now. SlimSnap is a screenshot app, not a compressor. Each capture's JSON has the text and layout box of every element, plus anything you mark. It won't flag what looks broken on its own. You draw a box or arrow on the problem, and that mark lands in the JSON tied to the element, so the agent knows exactly what you mean. For your desktop and phone width checks, two captures as JSON use far less context than two full screenshots.

Publisher

Alex Bickov's avatar
bickov
Is this your product? Claim it

Questions about SlimSnap

SlimSnap is a development product listed on Uneed, with a free version and paid features. It's tagged with Screenshots, Screen Recording. See the best Screenshots products for related options.

What is SlimSnap?

SlimSnap is turn a screenshot into JSON your CLI agent can read.

Is SlimSnap free?

SlimSnap has a free version. Some features or usage are paid. The current prices are on slimsnap.ai.

What are alternatives to SlimSnap?

Discover similar screenshots, screen recording, windows products in the Uneed directory.

What category does SlimSnap belong to?

SlimSnap is listed under Development on Uneed.

Products like SlimSnap

Best Screenshots products