#37455B
Closest named color: Dark Grey Blue (#29465B). oklch(38.8% 0.042 259.3), rgb(55, 69, 91).
Aa
White text reads best on this color (9.70:1).
About this color
#37455B is a dark, muted blue. In OKLCH its lightness is 39%, its chroma 0.042 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.018 away. White text reads best on it, at 9.70:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.16:1 |
| White text | 9.70:1 |
Values
| HEX | #37455B |
| RGB | rgb(55, 69, 91) |
| HSL | hsl(217, 25%, 29%) |
| OKLCH | oklch(38.8% 0.042 259.3) |
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 #37455B | 9.70:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #37455B | 2.16:1 | Fails | Lc 11.5 | Not readable |
| #37455B text on white | 9.70:1 | AAA | Lc 92.5 | Preferred for body text |
| #37455B text on black | 2.16:1 | Fails | Lc -10.0 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D2DAE5
oklch(88.6% 0.017 256.3)
-
Step 300
300
#B5C2D5
oklch(81% 0.03 257.8)
-
Step 400
400
#8EA2C0
oklch(70.7% 0.05 258.4)
-
Step 500
500
#728BB1
oklch(63.2% 0.064 258.6)
-
Step 600
600
#5B749C
oklch(55.6% 0.069 259.6)
-
Step 700
700
#4A6186
oklch(49% 0.066 259.7)
-
Step 800
800
#3D506D
oklch(42.8% 0.054 258.7)
-
Step 900
900 (this color)
#37455B
oklch(38.8% 0.042 259.3)
-
Step 950
950
#1F2734
oklch(27.1% 0.027 260)
#37455B 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) | #3D465C | 0.010 |
| Deuteranopia (no green cones) | #39435B | 0.007 |
| Tritanopia (no blue cones) | #2C4A4C | 0.038 |
| Achromatopsia (no color) | #444444 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37455B
#37455B
oklch(38.8% 0.042 259.3)
- #50422A
#50422A
oklch(38.7% 0.042 80.5)
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 #37455B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.018
- Charcoal #264653 ΔE 0.027
- Charcoal Grey #3C4142 ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.045
- Onyx #343A40 ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.052
- Dark Teal #014D4E ΔE 0.059
- Deep Teal #00555A ΔE 0.063
Use #37455B 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.