#28338D
Closest named color: Sapphire (#2138AB). oklch(37.3% 0.148 271.7), rgb(40, 51, 141).
Aa
White text reads best on this color (10.77:1).
About this color
#28338D is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.148 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.051 away. White text reads best on it, at 10.77:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.94:1 |
| White text | 10.77:1 |
Values
| HEX | #28338D |
| RGB | rgb(40, 51, 141) |
| HSL | hsl(233, 56%, 35%) |
| OKLCH | oklch(37.3% 0.148 271.7) |
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 #28338D | 10.77:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #28338D | 1.94:1 | Fails | Lc 9.5 | Not readable |
| #28338D text on white | 10.77:1 | AAA | Lc 94.5 | Preferred for body text |
| #28338D text on black | 1.94:1 | Fails | Lc -8.1 | 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
#627AFF
oklch(63.1% 0.198 271.8)
-
Step 600
600
#4957FF
oklch(55.6% 0.245 271.8)
-
Step 700
700
#3B44DF
oklch(49% 0.23 271.7)
-
Step 800
800
#303AB4
oklch(42.7% 0.19 271.7)
-
Step 900
900 (this color)
#28338D
oklch(37.3% 0.148 271.7)
-
Step 950
950
#182053
oklch(27.1% 0.093 272)
#28338D 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) | #004290 | 0.042 |
| Deuteranopia (no green cones) | #00398B | 0.032 |
| Tritanopia (no blue cones) | #004A5B | 0.119 |
| Achromatopsia (no color) | #3E3E3E | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28338D
#28338D
oklch(37.3% 0.148 271.7)
- #4F3E00
#4F3E00
oklch(37.1% 0.076 91.2)
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 #28338D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.051
- Cobalt #1E488F ΔE 0.054
- Twilight Blue #0A437A ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.058
- Blueberry #464196 ΔE 0.062
- Royal #0C1793 ΔE 0.069
- Marine Blue #01386A ΔE 0.071
- Indigo Blue #3A18B1 ΔE 0.072
Use #28338D 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.