Find the right look

One of six quick challenges

Example: Night reading app

Which color palette fits this idea?

A calm brief with one clear fit.

Saved answer from a real Jev runJev chose Harbor for this brief.

Apply Harbor for review. The pick meets your 80% rule and code already confirmed contrast. A person still reviews the rendered screen.

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Read the full evidence and result

Recorded example: Night reading app. The interactive version loads with JavaScript.

Evidence and options

A reading app for long articles at night. Low glare and calm, with one restrained accent color.

Harbor: Deep navy surfaces, pale gray text and one sea-glass green accent. Low glare and quiet, made for long sessions at night. Passes AA contrast in code.
Studio Paper: Warm paper white with charcoal text and a muted terracotta accent. Calm and editorial, like a printed magazine. Passes AA contrast in code.
Arcade: Near-black violet with neon magenta and electric yellow highlights. Loud, playful and high energy, made for games and events. Passes AA contrast in code.
Orchard: Soft cream with forest green headings and an apple red call to action. Friendly and outdoorsy, made for community and family sites. Passes AA contrast in code.
Mist: Pale fog gray with light slate text and a powder blue accent. Airy, minimal and soft. Excluded by code: Body text on background 2.64:1, needs 4.5:1; Secondary text on surface 1.99:1, needs 4.5:1; Button label on accent 1.85:1, needs 4.5:1; Accent against background 1.64:1, needs 3:1.

Recorded Jev answer, September 24, 2026

Choice palette: harbor, 99%

Jev chose Harbor for this brief.

Apply Harbor for review

The pick meets your 80% rule and code already confirmed contrast. A person still reviews the rendered screen.

Measured when recorded: 292 ms in the engine, 1 model call, 524 input tokens. A recorded answer, not a live run.

Exact typed request for this example

{
  "state": "Brief: A reading app for long articles at night. Low glare and calm, with one restrained accent color.",
  "questions": {
    "palette": {
      "type": "choice",
      "instructions": "Choose the supplied palette that best fits the brief. Use review if none fits. Use review when no supplied candidate is suitable or necessary facts are missing.",
      "criteria": {
        "harbor": "Deep navy surfaces, pale gray text and one sea-glass green accent. Low glare and quiet, made for long sessions at night.",
        "paper": "Warm paper white with charcoal text and a muted terracotta accent. Calm and editorial, like a printed magazine.",
        "arcade": "Near-black violet with neon magenta and electric yellow highlights. Loud, playful and high energy, made for games and events.",
        "orchard": "Soft cream with forest green headings and an apple red call to action. Friendly and outdoorsy, made for community and family sites.",
        "review": "No supplied candidate fits, required evidence is missing, or the choice is ambiguous."
      }
    }
  }
}

One Choice question over the palettes that pass code checks, plus a review option for no fit.

Jev suggests an answer from supplied evidence. You or your agent decides what to do next.