About Subterranean River
Subterranean River is a softly saturated, deep blue at #1f3b4d, sitting closest to steel_blue on the color wheel. In color psychology it reads as rational, steady, and modern — a deep presence and a cool cast, and it carries the steadiness designers lean on for trust-centered brands.
For text on Subterranean River, white performs best at 11.73:1 — passing WCAG AAA. In a palette it suits primary roles.
Contrast Accessibility
With white
11.73:1
With black
1.79:1
Color Conversions
#1f3b4d
rgb(31, 59, 77)
hsl(203°, 43%, 21%)
oklch(0.339 0.047 238.4)
cmyk(6000%, 2300%, 0%, 7000%)
Tint & Shade Scale
A 10-step scale from light to dark, anchored to the base color at step 500. Click any swatch to copy its hex.
Tone Scale
Color mixed with gray — reduces saturation without changing lightness. Click any swatch to copy its hex.
Temperature
Hue shifted cooler and warmer in equal steps. Click any swatch to copy its hex.
Color Psychology
Adds: weight, authority, gravitas, subtlety, refinement · Reduces: playfulness, lightness, visual intensity
Palette Narrative
A thoughtfully curated palette evoking anchoring, authoritative, modern. Well-suited for established and formal brand contexts. A focused selection that communicates intent clearly.
Inspired Palettes
Shades
Lightness variations keeping hue and chroma intact
Monochromatic
Single hue with varied lightness and chroma
Complementary
Opposite hues on the color wheel for maximum contrast
Triadic
Three evenly spaced hues for vibrant balance
Analogous
Neighboring hues for natural, serene combinations
Split Complementary
Complement split into two flanking hues
Generic Gradient
Smooth lightness ramp from dark to light
Matching Gradient
Lightness ramp with a gentle hue drift
Skip Gradient
Alternating light and dark steps for rhythm
9 of 28 palettes from #1f3b4d
Similar Colors
BS 7-086 - Midnight blue
#1D3C4EdeltaE 0.0Harpoon
#283B4CdeltaE 0.0Cool Air of Debonair
#28394DdeltaE 0.0Tarawera
#253C48deltaE 0.0Craft
#293B4AdeltaE 0.0Azzurro Aquarius
#243850deltaE 0.0