#37455E
Closest named color: Dark Grey Blue (#29465B). oklch(38.9% 0.046 261.8), rgb(55, 69, 94).
Aa
White text reads best on this color (9.65:1).
About this color
#37455E is a dark, muted blue. In OKLCH its lightness is 39%, its chroma 0.046 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.019 away. White text reads best on it, at 9.65:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.17:1 |
| White text | 9.65:1 |
Values
| HEX | #37455E |
| RGB | rgb(55, 69, 94) |
| HSL | hsl(218, 26%, 29%) |
| OKLCH | oklch(38.9% 0.046 261.8) |
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 #37455E | 9.65:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #37455E | 2.17:1 | Fails | Lc 11.6 | Not readable |
| #37455E text on white | 9.65:1 | AAA | Lc 92.3 | Preferred for body text |
| #37455E text on black | 2.17:1 | Fails | Lc -10.1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D2D9E6
oklch(88.4% 0.019 263)
-
Step 300
300
#B4C1D8
oklch(80.8% 0.036 261.9)
-
Step 400
400
#8EA1C4
oklch(70.7% 0.056 262.6)
-
Step 500
500
#728AB5
oklch(63.1% 0.071 261.9)
-
Step 600
600
#5A73A1
oklch(55.5% 0.078 262.2)
-
Step 700
700
#4A618A
oklch(49.2% 0.072 261.6)
-
Step 800
800
#3D4F70
oklch(42.7% 0.06 262.1)
-
Step 900
900 (this color)
#37455E
oklch(38.9% 0.046 261.8)
-
Step 950
950
#1E2735
oklch(27.1% 0.029 259.1)
#37455E 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) | #3C475F | 0.010 |
| Deuteranopia (no green cones) | #38435D | 0.006 |
| Tritanopia (no blue cones) | #2A4A4E | 0.040 |
| Achromatopsia (no color) | #454545 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37455E
#37455E
oklch(38.9% 0.046 261.8)
- #514227
#514227
oklch(38.8% 0.046 81.4)
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 #37455E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.019
- Charcoal #264653 ΔE 0.031
- Charcoal Grey #3C4142 ΔE 0.046
- Dark Slate Gray #2F4F4F ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.054
- Onyx #343A40 ΔE 0.055
- Dark Teal #014D4E ΔE 0.062
- Twilight Blue #0A437A ΔE 0.064
Use #37455E 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.