#284F87
Closest named color: Dusk Blue (#26538D). oklch(42.9% 0.103 257.7), rgb(40, 79, 135).
Aa
White text reads best on this color (8.20:1).
About this color
#284F87 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.103 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.014 away. White text reads best on it, at 8.20:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.55:1 |
| White text | 8.20:1 |
Values
| HEX | #284F87 |
| RGB | rgb(40, 79, 135) |
| HSL | hsl(215, 54%, 34%) |
| OKLCH | oklch(42.9% 0.103 257.7) |
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 #284F87 | 8.20:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #284F87 | 2.55:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #284F87 text on white | 8.20:1 | AAA | Lc 88.1 | Fine for body text |
| #284F87 text on black | 2.55:1 | Fails | Lc -14.0 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CCDAF0
oklch(88.5% 0.034 259.4)
-
Step 300
300
#A9C2E8
oklch(80.8% 0.061 258.7)
-
Step 400
400
#7AA2DD
oklch(70.6% 0.098 258)
-
Step 500
500
#588AD3
oklch(63.1% 0.123 257.8)
-
Step 600
600
#3D73C0
oklch(55.7% 0.133 257.5)
-
Step 700
700
#2F60A6
oklch(49.2% 0.124 257.7)
-
Step 800
800 (this color)
#284F87
oklch(42.9% 0.103 257.7)
-
Step 900
900
#25426C
oklch(37.8% 0.08 257.7)
-
Step 950
950
#16273F
oklch(27.1% 0.05 257.1)
#284F87 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) | #355489 | 0.022 |
| Deuteranopia (no green cones) | #274B86 | 0.012 |
| Tritanopia (no blue cones) | #005C64 | 0.083 |
| Achromatopsia (no color) | #4F4F4F | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284F87
#284F87
oklch(42.9% 0.103 257.7)
- #6A4800
#6A4800
oklch(42.9% 0.089 77.8)
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 #284F87, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.014
- Light Navy #155084 ΔE 0.016
- Deep Sea Blue #015482 ΔE 0.027
- Cobalt #1E488F ΔE 0.028
- Light Navy Blue #2E5A88 ΔE 0.034
- Denim Blue #3B5B92 ΔE 0.045
- Twilight Blue #0A437A ΔE 0.049
- Twilight #4E518B ΔE 0.050
Use #284F87 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.