#28499D
Closest named color: Cobalt (#1E488F). oklch(43.1% 0.142 264.8), rgb(40, 73, 157).
Aa
White text reads best on this color (8.30:1).
About this color
#28499D is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.142 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.025 away. White text reads best on it, at 8.30:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.53:1 |
| White text | 8.30:1 |
Values
| HEX | #28499D |
| RGB | rgb(40, 73, 157) |
| HSL | hsl(223, 59%, 39%) |
| OKLCH | oklch(43.1% 0.142 264.8) |
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 #28499D | 8.30:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #28499D | 2.53:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #28499D text on white | 8.30:1 | AAA | Lc 88.2 | Fine for body text |
| #28499D text on black | 2.53:1 | Fails | Lc -13.9 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9F9
oklch(88.4% 0.047 265.5)
-
Step 300
300
#A6C0F7
oklch(80.8% 0.083 264.9)
-
Step 400
400
#779EF4
oklch(70.7% 0.134 264.7)
-
Step 500
500
#5583EF
oklch(63.1% 0.17 264.7)
-
Step 600
600
#3C69DE
oklch(55.5% 0.186 265)
-
Step 700
700
#2F57C1
oklch(49.2% 0.172 265)
-
Step 800
800 (this color)
#28499D
oklch(43.1% 0.142 264.8)
-
Step 900
900
#243D7C
oklch(37.7% 0.111 265.2)
-
Step 950
950
#152448
oklch(26.9% 0.07 265)
#28499D 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) | #0E54A0 | 0.031 |
| Deuteranopia (no green cones) | #00499B | 0.024 |
| Tritanopia (no blue cones) | #005D6C | 0.112 |
| Achromatopsia (no color) | #4E4E4E | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28499D
#28499D
oklch(43.1% 0.142 264.8)
- #664B00
#664B00
oklch(43% 0.088 84.8)
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 #28499D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.025
- Dusk Blue #26538D ΔE 0.041
- Blueberry #464196 ΔE 0.041
- Sapphire #2138AB ΔE 0.049
- Light Navy #155084 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.062
- Denim Blue #3B5B92 ΔE 0.062
Use #28499D 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.