#28437E
Closest named color: Twilight Blue (#0A437A). oklch(39.4% 0.105 263.8), rgb(40, 67, 126).
Aa
White text reads best on this color (9.57:1).
About this color
#28437E is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.105 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.025 away. White text reads best on it, at 9.57:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.19:1 |
| White text | 9.57:1 |
Values
| HEX | #28437E |
| RGB | rgb(40, 67, 126) |
| HSL | hsl(221, 52%, 33%) |
| OKLCH | oklch(39.4% 0.105 263.8) |
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 #28437E | 9.57:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #28437E | 2.19:1 | Fails | Lc 12.0 | Not readable |
| #28437E text on white | 9.57:1 | AAA | Lc 91.9 | Preferred for body text |
| #28437E text on black | 2.19:1 | Fails | Lc -10.5 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF7
oklch(88.5% 0.044 262.4)
-
Step 300
300
#A7C1F4
oklch(80.9% 0.078 263.6)
-
Step 400
400
#789FEF
oklch(70.8% 0.125 263.7)
-
Step 500
500
#5684EA
oklch(63% 0.162 264.1)
-
Step 600
600
#3C6BD8
oklch(55.5% 0.175 264)
-
Step 700
700
#2E59BB
oklch(49.1% 0.162 263.7)
-
Step 800
800
#274998
oklch(42.7% 0.136 264)
-
Step 900
900 (this color)
#28437E
oklch(39.4% 0.105 263.8)
-
Step 950
950
#152547
oklch(27.1% 0.067 263.6)
#28437E 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) | #264980 | 0.017 |
| Deuteranopia (no green cones) | #17417D | 0.018 |
| Tritanopia (no blue cones) | #00515A | 0.088 |
| Achromatopsia (no color) | #454545 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28437E
#28437E
oklch(39.4% 0.105 263.8)
- #5B4200
#5B4200
oklch(39.6% 0.081 84.1)
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 #28437E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.025
- Cobalt #1E488F ΔE 0.030
- Light Navy #155084 ΔE 0.038
- Dusk Blue #26538D ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.052
- Blueberry #464196 ΔE 0.059
- Marine Blue #01386A ΔE 0.059
Use #28437E 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.