#284A88
Closest named color: Cobalt (#1E488F). oklch(41.8% 0.111 261.3), rgb(40, 74, 136).
Aa
White text reads best on this color (8.65:1).
About this color
#284A88 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.111 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.017 away. White text reads best on it, at 8.65:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.42:1 |
| White text | 8.65:1 |
Values
| HEX | #284A88 |
| RGB | rgb(40, 74, 136) |
| HSL | hsl(219, 55%, 35%) |
| OKLCH | oklch(41.8% 0.111 261.3) |
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 #284A88 | 8.65:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #284A88 | 2.42:1 | Fails | Lc 14.5 | Not readable |
| #284A88 text on white | 8.65:1 | AAA | Lc 89.4 | Fine for body text |
| #284A88 text on black | 2.42:1 | Fails | Lc -12.8 | 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
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF2
oklch(88.5% 0.036 261.3)
-
Step 300
300
#AAC2EB
oklch(81% 0.064 261.1)
-
Step 400
400
#7CA1E1
oklch(70.7% 0.103 261)
-
Step 500
500
#5B88D9
oklch(63.1% 0.132 261.4)
-
Step 600
600
#4170C6
oklch(55.6% 0.143 261.4)
-
Step 700
700
#335DAC
oklch(49.1% 0.135 261.7)
-
Step 800
800 (this color)
#284A88
oklch(41.8% 0.111 261.3)
-
Step 900
900
#26406F
oklch(37.6% 0.087 261.3)
-
Step 950
950
#172641
oklch(27% 0.055 261.4)
#284A88 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) | #2C508A | 0.019 |
| Deuteranopia (no green cones) | #1A4787 | 0.017 |
| Tritanopia (no blue cones) | #005862 | 0.089 |
| Achromatopsia (no color) | #4B4B4B | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284A88
#284A88
oklch(41.8% 0.111 261.3)
- #644700
#644700
oklch(41.9% 0.086 81.8)
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 #284A88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.017
- Light Navy #155084 ΔE 0.023
- Dusk Blue #26538D ΔE 0.026
- Deep Sea Blue #015482 ΔE 0.037
- Twilight Blue #0A437A ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.049
- Blueberry #464196 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.052
Use #284A88 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.