Color Similarity Skill

Overview

Color Similarity Calculator works by converting hex colors to RGB and HSL, calculating Euclidean distance in color space, and comparing hue, saturation, and lightness differences for comprehensive similarity analysis.

Live Test Color Similarity Skill Skill →

The tool

Once your client is connected to the VerveKit server, this appears in its tool list as ColorSimilaritySkill. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.

{
  "name": "ColorSimilaritySkill",
  "arguments": {
    "color1": "FF5733",
    "color2": "FF6B47"
  }
}

You do not name the tool yourself; the model picks it. Asking about FF5733 in the terms this skill covers is enough for it to reach for ColorSimilaritySkill on its own — naming it explicitly also works, and is the way to force the call.

Connecting

One server URL covers every skill in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervekit": {
      "url": "https://api.vervekit.com/v1/mcp"
    }
  }
}

https://api.vervekit.com/v1/mcp

Per-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

{
  "status": "ok",
  "error": null,
  "data": {
    "color1": {
      "hex": "#FF5733",
      "rgb": {
        "r": 255,
        "g": 87,
        "b": 51
      },
      "hsl": {
        "h": 10.6,
        "s": 100,
        "l": 60
      }
    },
    "color2": {
      "hex": "#FF6B47",
      "rgb": {
        "r": 255,
        "g": 107,
        "b": 71
      },
      "hsl": {
        "h": 11.7,
        "s": 100,
        "l": 63.9
      }
    },
    "rgb_distance": 28.28,
    "rgb_similarity": 93.6,
    "hsl_similarity": 97.71,
    "overall_similarity": 95.65,
    "delta_e": 28.28,
    "hue_difference": 1.15,
    "saturation_difference": 0,
    "lightness_difference": 3.92,
    "similarity_category": "nearly identical",
    "are_identical": false
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

A call costs 2 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Color Matching

Find and compare similar colors for design consistency and brand compliance

Image Processing

Compare colors in images for color correction and matching operations

Design Systems

Validate color palette consistency and identify similar colors in design systems

Quality Control

Compare product colors against standards for quality assurance and brand consistency

Other ways to use Color Similarity Skill

Set up Color Similarity Skill on VerveKit, or reach the same source a different way. Your VerveKit account and credits work on all of them — one key, one balance.

Related

More in Math/Calculations: