#37578D
Closest named color: Denim Blue (#3B5B92). oklch(45.9% 0.096 260.3), rgb(55, 87, 141).
Aa
White text reads best on this color (7.21:1).
About this color
#37578D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.096 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.015 away. White text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.91:1 |
| White text | 7.21:1 |
Values
| HEX | #37578D |
| RGB | rgb(55, 87, 141) |
| HSL | hsl(218, 44%, 38%) |
| OKLCH | oklch(45.9% 0.096 260.3) |
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 #37578D | 7.21:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #37578D | 2.91:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #37578D text on white | 7.21:1 | AAA | Lc 84.9 | Fine for body text |
| #37578D text on black | 2.91:1 | Fails | Lc -17.1 | 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 800.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ACC2E6
oklch(81% 0.056 260.2)
-
Step 400
400
#80A1D9
oklch(70.6% 0.09 260.7)
-
Step 500
500
#6089CF
oklch(63.1% 0.116 260.6)
-
Step 600
600
#4672BC
oklch(55.6% 0.125 260.2)
-
Step 700
700
#385FA2
oklch(49.1% 0.117 260.5)
-
Step 800
800 (this color)
#37578D
oklch(45.9% 0.096 260.3)
-
Step 900
900
#294169
oklch(37.6% 0.075 260.1)
-
Step 950
950
#19263E
oklch(27% 0.049 262)
#37578D 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) | #405B8F | 0.017 |
| Deuteranopia (no green cones) | #35538C | 0.012 |
| Tritanopia (no blue cones) | #00636B | 0.083 |
| Achromatopsia (no color) | #575757 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37578D
#37578D
oklch(45.9% 0.096 260.3)
- #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 #37578D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.015
- Light Navy Blue #2E5A88 ΔE 0.016
- Dusk Blue #26538D ΔE 0.022
- Twilight #4E518B ΔE 0.032
- Dusky Blue #475F94 ΔE 0.033
- Dusk #4E5481 ΔE 0.034
- Denim #3B638C ΔE 0.037
- YInMn Blue #415A77 ΔE 0.041
Use #37578D 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.