#37436F
Closest named color: Dark Grey Blue (#29465B). oklch(39.4% 0.076 271), rgb(55, 67, 111).
Aa
White text reads best on this color (9.56:1).
About this color
#37436F is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.076 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.043 away. White text reads best on it, at 9.56:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.19:1 |
| White text | 9.56:1 |
Values
| HEX | #37436F |
| RGB | rgb(55, 67, 111) |
| HSL | hsl(227, 34%, 33%) |
| OKLCH | oklch(39.4% 0.076 271) |
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 #37436F | 9.56:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #37436F | 2.19:1 | Fails | Lc 11.9 | Not readable |
| #37436F text on white | 9.56:1 | AAA | Lc 92.1 | Preferred for body text |
| #37436F text on black | 2.19:1 | Fails | Lc -10.3 | Not readable |
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 900.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6EAF5
oklch(93.7% 0.015 270)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B3BFE7
oklch(80.9% 0.058 272)
-
Step 400
400
#8B9EDA
oklch(70.7% 0.091 270.5)
-
Step 500
500
#6F84D0
oklch(63% 0.117 271)
-
Step 600
600
#586DBD
oklch(55.6% 0.127 270.7)
-
Step 700
700
#485AA3
oklch(49% 0.119 271)
-
Step 800
800
#3B4A84
oklch(42.6% 0.098 270.8)
-
Step 900
900 (this color)
#37436F
oklch(39.4% 0.076 271)
-
Step 950
950
#1E253E
oklch(27.1% 0.048 271.1)
#37436F 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) | #324871 | 0.015 |
| Deuteranopia (no green cones) | #2D436E | 0.014 |
| Tritanopia (no blue cones) | #214C53 | 0.068 |
| Achromatopsia (no color) | #454545 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37436F
#37436F
oklch(39.4% 0.076 271)
- #554408
#554408
oklch(39.4% 0.076 91.4)
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 #37436F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.043
- Twilight Blue #0A437A ΔE 0.045
- Light Navy #155084 ΔE 0.052
- Cobalt #1E488F ΔE 0.057
- Charcoal #264653 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.059
- Deep Sea Blue #015482 ΔE 0.061
- Dusk Blue #26538D ΔE 0.062
Use #37436F 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.