#28337F
Closest named color: Twilight Blue (#0A437A). oklch(36% 0.128 272.1), rgb(40, 51, 127).
Aa
White text reads best on this color (11.22:1).
About this color
#28337F is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.128 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.049 away. White text reads best on it, at 11.22:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.87:1 |
| White text | 11.22:1 |
Values
| HEX | #28337F |
| RGB | rgb(40, 51, 127) |
| HSL | hsl(232, 52%, 33%) |
| OKLCH | oklch(36% 0.128 272.1) |
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 #28337F | 11.22:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #28337F | 1.87:1 | Fails | Lc 8.4 | Not readable |
| #28337F text on white | 11.22:1 | AAA | Lc 95.5 | Preferred for body text |
| #28337F text on black | 1.87:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FD
oklch(88.5% 0.053 271.1)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8098FF
oklch(70.7% 0.153 272.1)
-
Step 500
500
#637AFE
oklch(63.1% 0.196 272.1)
-
Step 600
600
#4D5FED
oklch(55.7% 0.213 272)
-
Step 700
700
#3F4DCF
oklch(49.2% 0.199 272)
-
Step 800
800
#3340A7
oklch(42.7% 0.165 271.9)
-
Step 900
900 (this color)
#28337F
oklch(36% 0.128 272.1)
-
Step 950
950
#19214D
oklch(26.8% 0.081 272.1)
#28337F 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) | #003F82 | 0.039 |
| Deuteranopia (no green cones) | #00377D | 0.033 |
| Tritanopia (no blue cones) | #004653 | 0.107 |
| Achromatopsia (no color) | #3B3B3B | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28337F
#28337F
oklch(36% 0.128 272.1)
- #4B3B00
#4B3B00
oklch(35.9% 0.073 91.6)
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 #28337F, closest first.
No curated palette has a color within ΔE 0.04 of #28337F.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.049
- Marine Blue #01386A ΔE 0.052
- Cobalt #1E488F ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.062
- Marine #042E60 ΔE 0.068
- Blueberry #464196 ΔE 0.072
- Prussian Blue #1D3557 ΔE 0.073
- Midnight Blue #191970 ΔE 0.074
Use #28337F 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.