#28374E
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.4% 0.046 258.7), rgb(40, 55, 78).
Aa
White text reads best on this color (12.02:1).
About this color
#28374E is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.046 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.017 away. White text reads best on it, at 12.02:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.74:1 |
| White text | 12.02:1 |
Values
| HEX | #28374E |
| RGB | rgb(40, 55, 78) |
| HSL | hsl(216, 32%, 23%) |
| OKLCH | oklch(33.4% 0.046 258.7) |
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 #28374E | 12.02:1 | AAA | Lc -101.0 | Preferred for body text |
| Black text on #28374E | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #28374E text on white | 12.02:1 | AAA | Lc 97.5 | Preferred for body text |
| #28374E text on black | 1.74:1 | Fails | Lc 0.0 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D2DAE6
oklch(88.6% 0.019 258.4)
-
Step 300
300
#B4C2D7
oklch(81% 0.033 258.4)
-
Step 400
400
#8CA2C3
oklch(70.7% 0.054 258.4)
-
Step 500
500
#708BB4
oklch(63.2% 0.069 258.6)
-
Step 600
600
#5874A0
oklch(55.6% 0.076 259.2)
-
Step 700
700
#486189
oklch(49% 0.071 259.6)
-
Step 800
800
#3B506F
oklch(42.8% 0.058 258)
-
Step 900
900 (this color)
#28374E
oklch(33.4% 0.046 258.7)
-
Step 950
950
#1E2735
oklch(27.1% 0.029 259.1)
#28374E 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) | #2E384F | 0.010 |
| Deuteranopia (no green cones) | #2A354E | 0.007 |
| Tritanopia (no blue cones) | #1A3C3F | 0.040 |
| Achromatopsia (no color) | #363636 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28374E
#28374E
oklch(33.4% 0.046 258.7)
- #43341A
#43341A
oklch(33.5% 0.045 80)
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 #28374E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.017
- Prussian Blue #1D3557 ΔE 0.023
- Gunmetal #293241 ΔE 0.025
- Midnight Green #073B4C ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.034
- Onyx #343A40 ΔE 0.034
- Charcoal #264653 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.049
Use #28374E 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.