#27428D
Closest named color: Cobalt (#1E488F). oklch(40.3% 0.129 265.9), rgb(39, 66, 141).
Aa
White text reads best on this color (9.33:1).
About this color
#27428D is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.129 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.017 away. White text reads best on it, at 9.33:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.25:1 |
| White text | 9.33:1 |
Values
| HEX | #27428D |
| RGB | rgb(39, 66, 141) |
| HSL | hsl(224, 57%, 35%) |
| OKLCH | oklch(40.3% 0.129 265.9) |
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 #27428D | 9.33:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #27428D | 2.25:1 | Fails | Lc 12.8 | Not readable |
| #27428D text on white | 9.33:1 | AAA | Lc 91.2 | Preferred for body text |
| #27428D text on black | 2.25:1 | Fails | Lc -11.2 | 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 800.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F6
oklch(88.5% 0.042 266.3)
-
Step 300
300
#AAC0F2
oklch(80.9% 0.075 266.2)
-
Step 400
400
#7D9EEC
oklch(70.7% 0.121 265.9)
-
Step 500
500
#5D84E6
oklch(63.2% 0.154 265.8)
-
Step 600
600
#446BD4
oklch(55.6% 0.167 265.8)
-
Step 700
700
#3659B8
oklch(49.2% 0.156 265.7)
-
Step 800
800 (this color)
#27428D
oklch(40.3% 0.129 265.9)
-
Step 900
900
#283E76
oklch(37.7% 0.1 265.7)
-
Step 950
950
#182545
oklch(27.1% 0.062 265.8)
#27428D 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) | #124C90 | 0.029 |
| Deuteranopia (no green cones) | #00428B | 0.026 |
| Tritanopia (no blue cones) | #005461 | 0.104 |
| Achromatopsia (no color) | #474747 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #27428D
#27428D
oklch(40.3% 0.129 265.9)
- #5C4400
#5C4400
oklch(40.2% 0.082 85.6)
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 #27428D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.017
- Twilight Blue #0A437A ΔE 0.040
- Blueberry #464196 ΔE 0.045
- Light Navy #155084 ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.046
- Dusk Blue #26538D ΔE 0.048
- Sapphire #2138AB ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.059
Use #27428D 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.