#37709D
Closest named color: Muted Blue (#3B719F). oklch(52.7% 0.093 244.8), rgb(55, 112, 157).
Aa
White text reads best on this color (5.29:1).
About this color
#37709D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.093 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.006 away. White text reads best on it, at 5.29:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.96:1 |
| White text | 5.29:1 |
Values
| HEX | #37709D |
| RGB | rgb(55, 112, 157) |
| HSL | hsl(206, 48%, 42%) |
| OKLCH | oklch(52.7% 0.093 244.8) |
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 #37709D | 5.29:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #37709D | 3.96:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #37709D text on white | 5.29:1 | AA | Lc 76.1 | Fine for body text |
| #37709D text on black | 3.96:1 | AA large text | Lc -25.6 | 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
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CDDBE8
oklch(88.5% 0.023 246.1)
-
Step 300
300
#ABC4DA
oklch(80.9% 0.041 244.9)
-
Step 400
400
#7DA6C8
oklch(70.8% 0.067 243.9)
-
Step 500
500
#5B8FBA
oklch(63.1% 0.086 244.7)
-
Step 600
600 (this color)
#37709D
oklch(52.7% 0.093 244.8)
-
Step 700
700
#31658E
oklch(49% 0.086 244.7)
-
Step 800
800
#2A5374
oklch(42.8% 0.072 244.9)
-
Step 900
900
#26455D
oklch(37.8% 0.055 243.4)
-
Step 950
950
#172837
oklch(26.9% 0.036 246.3)
#37709D 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) | #5C719F | 0.042 |
| Deuteranopia (no green cones) | #4E679C | 0.033 |
| Tritanopia (no blue cones) | #007B80 | 0.070 |
| Achromatopsia (no color) | #6B6B6B | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37709D
#37709D
oklch(52.7% 0.093 244.8)
- #905F2B
#905F2B
oklch(52.8% 0.093 64.8)
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 #37709D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.006
- Flat Blue #3C73A8 ΔE 0.019
- Dull Blue #49759C ΔE 0.025
- Ocean Blue #03719C ΔE 0.026
- Sea Blue #047495 ΔE 0.032
- French Blue #436BAD ΔE 0.034
- Metallic Blue #4F738E ΔE 0.036
- Cerulean #457B9D ΔE 0.037
Use #37709D 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.