#284C8F
Closest named color: Cobalt (#1E488F). oklch(42.7% 0.119 261.5), rgb(40, 76, 143).
Aa
White text reads best on this color (8.33:1).
About this color
#284C8F is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.119 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.016 away. White text reads best on it, at 8.33:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.52:1 |
| White text | 8.33:1 |
Values
| HEX | #284C8F |
| RGB | rgb(40, 76, 143) |
| HSL | hsl(219, 56%, 36%) |
| OKLCH | oklch(42.7% 0.119 261.5) |
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 #284C8F | 8.33:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #284C8F | 2.52:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #284C8F text on white | 8.33:1 | AAA | Lc 88.4 | Fine for body text |
| #284C8F text on black | 2.52:1 | Fails | Lc -13.7 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CBDAF3
oklch(88.5% 0.038 260.7)
-
Step 300
300
#A8C2EE
oklch(81% 0.069 260.9)
-
Step 400
400
#7AA0E6
oklch(70.6% 0.111 262.1)
-
Step 500
500
#5887DE
oklch(63% 0.141 261.7)
-
Step 600
600
#3D6FCC
oklch(55.6% 0.154 261.5)
-
Step 700
700
#2F5CB1
oklch(49% 0.144 261.7)
-
Step 800
800 (this color)
#284C8F
oklch(42.7% 0.119 261.5)
-
Step 900
900
#254072
oklch(37.7% 0.092 261.6)
-
Step 950
950
#162643
oklch(27.1% 0.058 261.5)
#284C8F 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) | #2A5392 | 0.021 |
| Deuteranopia (no green cones) | #154A8E | 0.017 |
| Tritanopia (no blue cones) | #005C66 | 0.096 |
| Achromatopsia (no color) | #4E4E4E | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284C8F
#284C8F
oklch(42.7% 0.119 261.5)
- #674900
#674900
oklch(42.7% 0.088 81.6)
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 #284C8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.016
- Dusk Blue #26538D ΔE 0.021
- Light Navy #155084 ΔE 0.027
- Deep Sea Blue #015482 ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.046
- Blueberry #464196 ΔE 0.047
- Twilight Blue #0A437A ΔE 0.050
- Denim Blue #3B5B92 ΔE 0.051
Use #284C8F 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.