#37709B
Closest named color: Muted Blue (#3B719F). oklch(52.6% 0.091 243.6), rgb(55, 112, 155).
Aa
White text reads best on this color (5.31:1).
About this color
#37709B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.091 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.008 away. White text reads best on it, at 5.31:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.95:1 |
| White text | 5.31:1 |
Values
| HEX | #37709B |
| RGB | rgb(55, 112, 155) |
| HSL | hsl(206, 48%, 41%) |
| OKLCH | oklch(52.6% 0.091 243.6) |
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 #37709B | 5.31:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #37709B | 3.95:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #37709B text on white | 5.31:1 | AA | Lc 76.2 | Fine for body text |
| #37709B text on black | 3.95:1 | AA large text | Lc -25.5 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CDDBE7
oklch(88.4% 0.022 243.8)
-
Step 300
300
#ABC4D9
oklch(80.8% 0.04 243.6)
-
Step 400
400
#7EA6C7
oklch(70.8% 0.065 243.8)
-
Step 500
500
#5B8FB8
oklch(63% 0.083 243.4)
-
Step 600
600 (this color)
#37709B
oklch(52.6% 0.091 243.6)
-
Step 700
700
#32668D
oklch(49.2% 0.084 243.4)
-
Step 800
800
#2A5372
oklch(42.7% 0.069 243.3)
-
Step 900
900
#27455C
oklch(37.8% 0.053 243)
-
Step 950
950
#172836
oklch(26.9% 0.035 244.4)
#37709B 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) | #5D719D | 0.043 |
| Deuteranopia (no green cones) | #4F679A | 0.033 |
| Tritanopia (no blue cones) | #007A7F | 0.067 |
| Achromatopsia (no color) | #6B6B6B | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37709B
#37709B
oklch(52.6% 0.091 243.6)
- #8F5E2D
#8F5E2D
oklch(52.5% 0.091 63.4)
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 #37709B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.008
- Flat Blue #3C73A8 ΔE 0.022
- Dull Blue #49759C ΔE 0.025
- Ocean Blue #03719C ΔE 0.025
- Sea Blue #047495 ΔE 0.030
- Metallic Blue #4F738E ΔE 0.034
- Cerulean #457B9D ΔE 0.037
- French Blue #436BAD ΔE 0.037
Use #37709B 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.