#284599
Closest named color: Cobalt (#1E488F). oklch(41.9% 0.142 266), rgb(40, 69, 153).
Aa
White text reads best on this color (8.74:1).
About this color
#284599 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.142 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.021 away. White text reads best on it, at 8.74:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.40:1 |
| White text | 8.74:1 |
Values
| HEX | #284599 |
| RGB | rgb(40, 69, 153) |
| HSL | hsl(225, 59%, 38%) |
| OKLCH | oklch(41.9% 0.142 266) |
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 #284599 | 8.74:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #284599 | 2.40:1 | Fails | Lc 14.4 | Not readable |
| #284599 text on white | 8.74:1 | AAA | Lc 89.5 | Fine for body text |
| #284599 text on black | 2.40:1 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CBD9F9
oklch(88.5% 0.047 266.7)
-
Step 300
300
#A8C0F7
oklch(80.9% 0.083 266.3)
-
Step 400
400
#7A9DF3
oklch(70.7% 0.132 266.3)
-
Step 500
500
#5982EF
oklch(63.1% 0.17 266.2)
-
Step 600
600
#4069DD
oklch(55.6% 0.183 265.9)
-
Step 700
700
#3256C0
oklch(49% 0.171 266)
-
Step 800
800 (this color)
#284599
oklch(41.9% 0.142 266)
-
Step 900
900
#263D7C
oklch(37.8% 0.111 266.1)
-
Step 950
950
#162448
oklch(26.9% 0.07 265.9)
#284599 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) | #02509C | 0.033 |
| Deuteranopia (no green cones) | #004697 | 0.025 |
| Tritanopia (no blue cones) | #005968 | 0.112 |
| Achromatopsia (no color) | #4B4B4B | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284599
#284599
oklch(41.9% 0.142 266)
- #624900
#624900
oklch(42.1% 0.086 86)
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 #284599, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.021
- Blueberry #464196 ΔE 0.039
- Sapphire #2138AB ΔE 0.044
- Dusk Blue #26538D ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.050
- Light Navy #155084 ΔE 0.051
- Twilight Blue #0A437A ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.064
Use #284599 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.