#37709E
Closest named color: Muted Blue (#3B719F). oklch(52.8% 0.094 245.3), rgb(55, 112, 158).
Aa
White text reads best on this color (5.28:1).
About this color
#37709E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.094 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.005 away. White text reads best on it, at 5.28:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.97:1 |
| White text | 5.28:1 |
Values
| HEX | #37709E |
| RGB | rgb(55, 112, 158) |
| HSL | hsl(207, 48%, 42%) |
| OKLCH | oklch(52.8% 0.094 245.3) |
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 #37709E | 5.28:1 | AA | Lc -81.4 | Fine for body text |
| Black text on #37709E | 3.97:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #37709E text on white | 5.28:1 | AA | Lc 76.1 | Fine for body text |
| #37709E text on black | 3.97:1 | AA large text | Lc -25.7 | 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
#ABC4DB
oklch(80.9% 0.042 246.1)
-
Step 400
400
#7DA5C9
oklch(70.6% 0.069 246.1)
-
Step 500
500
#5B8FBB
oklch(63.1% 0.087 245.3)
-
Step 600
600 (this color)
#37709E
oklch(52.8% 0.094 245.3)
-
Step 700
700
#31658F
oklch(49.1% 0.088 245.3)
-
Step 800
800
#2A5374
oklch(42.8% 0.072 244.9)
-
Step 900
900
#26455E
oklch(37.8% 0.057 244.4)
-
Step 950
950
#172837
oklch(26.9% 0.036 246.3)
#37709E 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) | #5C71A0 | 0.042 |
| Deuteranopia (no green cones) | #4E679D | 0.032 |
| Tritanopia (no blue cones) | #007B80 | 0.071 |
| Achromatopsia (no color) | #6C6C6C | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37709E
#37709E
oklch(52.8% 0.094 245.3)
- #905F29
#905F29
oklch(52.8% 0.094 65.6)
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 #37709E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.005
- Flat Blue #3C73A8 ΔE 0.018
- Dull Blue #49759C ΔE 0.025
- Ocean Blue #03719C ΔE 0.026
- Sea Blue #047495 ΔE 0.033
- French Blue #436BAD ΔE 0.033
- Nice Blue #107AB0 ΔE 0.037
- Metallic Blue #4F738E ΔE 0.037
Use #37709E 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.