#37578E
Closest named color: Denim Blue (#3B5B92). oklch(45.9% 0.098 260.6), rgb(55, 87, 142).
Aa
White text reads best on this color (7.20:1).
About this color
#37578E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.098 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.014 away. White text reads best on it, at 7.20:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.91:1 |
| White text | 7.20:1 |
Values
| HEX | #37578E |
| RGB | rgb(55, 87, 142) |
| HSL | hsl(218, 44%, 39%) |
| OKLCH | oklch(45.9% 0.098 260.6) |
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 #37578E | 7.20:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #37578E | 2.91:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #37578E text on white | 7.20:1 | AAA | Lc 84.8 | Fine for body text |
| #37578E text on black | 2.91:1 | Fails | Lc -17.2 | 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 700.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AFC2E0
oklch(80.9% 0.047 259.5)
-
Step 400
400
#86A2D0
oklch(70.8% 0.075 260.2)
-
Step 500
500
#678AC4
oklch(63.1% 0.097 260.2)
-
Step 600
600
#4F73B1
oklch(55.7% 0.105 260.7)
-
Step 700
700 (this color)
#37578E
oklch(45.9% 0.098 260.6)
-
Step 800
800
#354F7B
oklch(42.8% 0.08 260.4)
-
Step 900
900
#2E4263
oklch(37.8% 0.062 260.1)
-
Step 950
950
#1B273A
oklch(27.1% 0.039 259.4)
#37578E 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) | #405C90 | 0.019 |
| Deuteranopia (no green cones) | #34548D | 0.010 |
| Tritanopia (no blue cones) | #00636B | 0.085 |
| Achromatopsia (no color) | #575757 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37578E
#37578E
oklch(45.9% 0.098 260.6)
- #735100
#735100
oklch(46% 0.095 80.6)
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 #37578E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.014
- Light Navy Blue #2E5A88 ΔE 0.017
- Dusk Blue #26538D ΔE 0.022
- Twilight #4E518B ΔE 0.032
- Dusky Blue #475F94 ΔE 0.033
- Dusk #4E5481 ΔE 0.035
- Denim #3B638C ΔE 0.038
- Light Navy #155084 ΔE 0.042
Use #37578E 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.