#27438B
Closest named color: Cobalt (#1E488F). oklch(40.4% 0.125 265.2), rgb(39, 67, 139).
Aa
White text reads best on this color (9.28:1).
About this color
#27438B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.125 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.015 away. White text reads best on it, at 9.28:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.28:1 |
Values
| HEX | #27438B |
| RGB | rgb(39, 67, 139) |
| HSL | hsl(223, 56%, 35%) |
| OKLCH | oklch(40.4% 0.125 265.2) |
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 #27438B | 9.28:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #27438B | 2.26:1 | Fails | Lc 12.9 | Not readable |
| #27438B text on white | 9.28:1 | AAA | Lc 91.1 | Preferred for body text |
| #27438B text on black | 2.26:1 | Fails | Lc -11.3 | 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 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
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#AAC0F1
oklch(80.8% 0.074 265.9)
-
Step 400
400
#7D9FEA
oklch(70.8% 0.117 265)
-
Step 500
500
#5D85E3
oklch(63.2% 0.149 265.1)
-
Step 600
600
#446CD1
oklch(55.6% 0.162 265.2)
-
Step 700
700
#365AB5
oklch(49.2% 0.15 265.1)
-
Step 800
800 (this color)
#27438B
oklch(40.4% 0.125 265.2)
-
Step 900
900
#283E75
oklch(37.6% 0.098 265.5)
-
Step 950
950
#182544
oklch(27% 0.061 265.4)
#27438B 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) | #184C8E | 0.026 |
| Deuteranopia (no green cones) | #00438A | 0.026 |
| Tritanopia (no blue cones) | #005460 | 0.101 |
| Achromatopsia (no color) | #474747 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #27438B
#27438B
oklch(40.4% 0.125 265.2)
- #5D4400
#5D4400
oklch(40.3% 0.083 84.7)
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 #27438B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.015
- Twilight Blue #0A437A ΔE 0.038
- Light Navy #155084 ΔE 0.041
- Dusk Blue #26538D ΔE 0.045
- Blueberry #464196 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.055
- Sapphire #2138AB ΔE 0.060
Use #27438B 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.