#284DA1
Closest named color: Cobalt (#1E488F). oklch(44.3% 0.143 263.7), rgb(40, 77, 161).
Aa
White text reads best on this color (7.87:1).
About this color
#284DA1 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.143 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.034 away. White text reads best on it, at 7.87:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.66:1 |
| White text | 7.87:1 |
Values
| HEX | #284DA1 |
| RGB | rgb(40, 77, 161) |
| HSL | hsl(222, 60%, 39%) |
| OKLCH | oklch(44.3% 0.143 263.7) |
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 #284DA1 | 7.87:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #284DA1 | 2.66:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #284DA1 text on white | 7.87:1 | AAA | Lc 86.9 | Fine for body text |
| #284DA1 text on black | 2.66:1 | Fails | Lc -15.2 | Dividers and decoration only |
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
#CADAF9
oklch(88.6% 0.046 263.7)
-
Step 300
300
#A5C1F7
oklch(80.9% 0.083 263.3)
-
Step 400
400
#759EF4
oklch(70.6% 0.134 263.9)
-
Step 500
500
#5284EF
oklch(63.2% 0.17 263.5)
-
Step 600
600
#386ADE
oklch(55.6% 0.186 263.8)
-
Step 700
700
#2A58C1
oklch(49.2% 0.173 263.5)
-
Step 800
800 (this color)
#284DA1
oklch(44.3% 0.143 263.7)
-
Step 900
900
#213E7C
oklch(37.8% 0.111 263.2)
-
Step 950
950
#142549
oklch(27.2% 0.071 263.4)
#284DA1 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) | #1757A4 | 0.027 |
| Deuteranopia (no green cones) | #004C9F | 0.024 |
| Tritanopia (no blue cones) | #00616F | 0.113 |
| Achromatopsia (no color) | #515151 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284DA1
#284DA1
oklch(44.3% 0.143 263.7)
- #6B4E00
#6B4E00
oklch(44.3% 0.091 83.8)
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 #284DA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.034
- Dusk Blue #26538D ΔE 0.039
- Blueberry #464196 ΔE 0.047
- Light Navy #155084 ΔE 0.053
- Denim Blue #3B5B92 ΔE 0.055
- Sapphire #2138AB ΔE 0.056
- Light Navy Blue #2E5A88 ΔE 0.060
- Twilight #4E518B ΔE 0.061
Use #284DA1 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.