#28338F
Closest named color: Sapphire (#2138AB). oklch(37.5% 0.151 271.6), rgb(40, 51, 143).
Aa
White text reads best on this color (10.71:1).
About this color
#28338F is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.151 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.048 away. White text reads best on it, at 10.71:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.96:1 |
| White text | 10.71:1 |
Values
| HEX | #28338F |
| RGB | rgb(40, 51, 143) |
| HSL | hsl(234, 56%, 36%) |
| OKLCH | oklch(37.5% 0.151 271.6) |
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 #28338F | 10.71:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #28338F | 1.96:1 | Fails | Lc 9.6 | Not readable |
| #28338F text on white | 10.71:1 | AAA | Lc 94.3 | Preferred for body text |
| #28338F text on black | 1.96:1 | Fails | Lc -8.3 | 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 900.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#AABDFF
oklch(80.8% 0.096 271.7)
-
Step 400
400
#7F98FF
oklch(70.6% 0.153 271.7)
-
Step 500
500
#617AFF
oklch(63% 0.198 271.6)
-
Step 600
600
#4857FF
oklch(55.6% 0.245 271.6)
-
Step 700
700
#3B43E2
oklch(49.1% 0.234 271.7)
-
Step 800
800
#3039B6
oklch(42.7% 0.193 271.8)
-
Step 900
900 (this color)
#28338F
oklch(37.5% 0.151 271.6)
-
Step 950
950
#172054
oklch(27.1% 0.095 271.2)
#28338F 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) | #004392 | 0.044 |
| Deuteranopia (no green cones) | #00398D | 0.031 |
| Tritanopia (no blue cones) | #004B5C | 0.121 |
| Achromatopsia (no color) | #3E3E3E | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28338F
#28338F
oklch(37.5% 0.151 271.6)
- #503F00
#503F00
oklch(37.5% 0.077 91.5)
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 #28338F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.048
- Cobalt #1E488F ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.059
- Twilight Blue #0A437A ΔE 0.060
- Blueberry #464196 ΔE 0.061
- Royal #0C1793 ΔE 0.068
- Indigo Blue #3A18B1 ΔE 0.069
- Marine Blue #01386A ΔE 0.073
Use #28338F 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.