#28398D
Closest named color: Cobalt (#1E488F). oklch(38.5% 0.14 269.8), rgb(40, 57, 141).
Aa
White text reads best on this color (10.19:1).
About this color
#28398D is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.140 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.039 away. White text reads best on it, at 10.19:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.06:1 |
| White text | 10.19:1 |
Values
| HEX | #28398D |
| RGB | rgb(40, 57, 141) |
| HSL | hsl(230, 56%, 35%) |
| OKLCH | oklch(38.5% 0.14 269.8) |
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 #28398D | 10.19:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #28398D | 2.06:1 | Fails | Lc 10.7 | Not readable |
| #28398D text on white | 10.19:1 | AAA | Lc 93.2 | Preferred for body text |
| #28398D text on black | 2.06:1 | Fails | Lc -9.3 | 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
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500
#5C7CFF
oklch(63.1% 0.197 269.6)
-
Step 600
600
#435CF9
oklch(55.6% 0.234 269.8)
-
Step 700
700
#364AD9
oklch(49.1% 0.217 269.8)
-
Step 800
800
#2C3EAF
oklch(42.7% 0.18 269.8)
-
Step 900
900 (this color)
#28398D
oklch(38.5% 0.14 269.8)
-
Step 950
950
#162151
oklch(27% 0.089 269.8)
#28398D 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) | #004690 | 0.039 |
| Deuteranopia (no green cones) | #003D8B | 0.029 |
| Tritanopia (no blue cones) | #004E5D | 0.114 |
| Achromatopsia (no color) | #414141 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28398D
#28398D
oklch(38.5% 0.14 269.8)
- #544100
#544100
oklch(38.5% 0.079 89.8)
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 #28398D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.039
- Twilight Blue #0A437A ΔE 0.049
- Sapphire #2138AB ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.050
- Blueberry #464196 ΔE 0.053
- Light Navy #155084 ΔE 0.067
- Marine Blue #01386A ΔE 0.070
- Dusk Blue #26538D ΔE 0.072
Use #28398D 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.