#57739B
Closest named color: Dull Blue (#49759C). oklch(55% 0.071 257.3), rgb(87, 115, 155).
Aa
White text reads best on this color (4.84:1).
About this color
#57739B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.071 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.016 away. White text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.33:1 |
| White text | 4.84:1 |
Values
| HEX | #57739B |
| RGB | rgb(87, 115, 155) |
| HSL | hsl(215, 28%, 47%) |
| OKLCH | oklch(55% 0.071 257.3) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #57739B | 4.84:1 | AA | Lc -79.0 | Fine for body text |
| Black text on #57739B | 4.33:1 | AA large text | Lc 30.5 | Non-text elements, placeholder text |
| #57739B text on white | 4.84:1 | AA | Lc 73.6 | Content text, not long reading |
| #57739B text on black | 4.33:1 | AA large text | Lc -28.1 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D2DAE5
oklch(88.6% 0.017 256.3)
-
Step 300
300
#B4C2D6
oklch(81% 0.032 257.2)
-
Step 400
400
#8DA2C1
oklch(70.7% 0.051 258)
-
Step 500
500
#708BB1
oklch(63% 0.065 257)
-
Step 600
600 (this color)
#57739B
oklch(55% 0.071 257.3)
-
Step 700
700
#496286
oklch(49.2% 0.065 257.5)
-
Step 800
800
#3C506D
oklch(42.7% 0.055 257.6)
-
Step 900
900
#334258
oklch(37.6% 0.043 257.8)
-
Step 950
950
#1E2734
oklch(27% 0.028 257.5)
#57739B with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #64759D | 0.019 |
| Deuteranopia (no green cones) | #5C6F9A | 0.012 |
| Tritanopia (no blue cones) | #3E7C81 | 0.063 |
| Achromatopsia (no color) | #717171 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57739B
#57739B
oklch(55% 0.071 257.3)
- #896C40
#896C40
oklch(55% 0.071 76.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #57739B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.016
- Stormy Blue #507B9C ΔE 0.023
- Metallic Blue #4F738E ΔE 0.024
- Cerulean #457B9D ΔE 0.028
- Muted Blue #3B719F ΔE 0.032
- Flat Blue #3C73A8 ΔE 0.034
- Grey Blue #647D8E ΔE 0.045
- French Blue #436BAD ΔE 0.048
Use #57739B in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.