#28439F
Closest named color: Cobalt (#1E488F). oklch(42% 0.153 267.1), rgb(40, 67, 159).
Aa
White text reads best on this color (8.77:1).
About this color
#28439F is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.153 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.031 away. White text reads best on it, at 8.77:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.39:1 |
| White text | 8.77:1 |
Values
| HEX | #28439F |
| RGB | rgb(40, 67, 159) |
| HSL | hsl(226, 60%, 39%) |
| OKLCH | oklch(42% 0.153 267.1) |
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 #28439F | 8.77:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #28439F | 2.39:1 | Fails | Lc 14.4 | Not readable |
| #28439F text on white | 8.77:1 | AAA | Lc 89.6 | Fine for body text |
| #28439F text on black | 2.39:1 | Fails | Lc -12.7 | 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 800.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A7BFFB
oklch(80.8% 0.089 267.5)
-
Step 400
400
#799CF9
oklch(70.7% 0.142 267.2)
-
Step 500
500
#5880F7
oklch(63.2% 0.183 267.1)
-
Step 600
600
#4066E5
oklch(55.7% 0.197 267.1)
-
Step 700
700
#3253C7
oklch(49% 0.185 267.1)
-
Step 800
800 (this color)
#28439F
oklch(42% 0.153 267.1)
-
Step 900
900
#253B80
oklch(37.6% 0.12 267.1)
-
Step 950
950
#16234B
oklch(26.9% 0.076 267.6)
#28439F 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) | #0050A2 | 0.036 |
| Deuteranopia (no green cones) | #00459D | 0.025 |
| Tritanopia (no blue cones) | #005A6A | 0.122 |
| Achromatopsia (no color) | #4B4B4B | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28439F
#28439F
oklch(42% 0.153 267.1)
- #614900
#614900
oklch(41.9% 0.086 87)
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 #28439F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.031
- Sapphire #2138AB ΔE 0.034
- Blueberry #464196 ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.054
- Dusk Blue #26538D ΔE 0.056
- Light Navy #155084 ΔE 0.062
- Blue Blue #2242C7 ΔE 0.064
- Twilight Blue #0A437A ΔE 0.067
Use #28439F 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.