#284188
Closest named color: Cobalt (#1E488F). oklch(39.7% 0.123 266.3), rgb(40, 65, 136).
Aa
White text reads best on this color (9.53:1).
About this color
#284188 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.123 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.022 away. White text reads best on it, at 9.53:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.20:1 |
| White text | 9.53:1 |
Values
| HEX | #284188 |
| RGB | rgb(40, 65, 136) |
| HSL | hsl(224, 55%, 35%) |
| OKLCH | oklch(39.7% 0.123 266.3) |
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 #284188 | 9.53:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #284188 | 2.20:1 | Fails | Lc 12.2 | Not readable |
| #284188 text on white | 9.53:1 | AAA | Lc 91.7 | Preferred for body text |
| #284188 text on black | 2.20:1 | Fails | Lc -10.6 | 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 900.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FC
oklch(88.5% 0.051 267)
-
Step 300
300
#A5C0FD
oklch(81% 0.092 265.9)
-
Step 400
400
#769CFC
oklch(70.7% 0.147 266.4)
-
Step 500
500
#5480FA
oklch(63.2% 0.188 266.2)
-
Step 600
600
#3B65E9
oklch(55.6% 0.205 266.3)
-
Step 700
700
#2E53CA
oklch(49.1% 0.19 266.2)
-
Step 800
800
#2745A4
oklch(42.8% 0.158 266.4)
-
Step 900
900 (this color)
#284188
oklch(39.7% 0.123 266.3)
-
Step 950
950
#15234C
oklch(27% 0.078 266.9)
#284188 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) | #174A8B | 0.026 |
| Deuteranopia (no green cones) | #004187 | 0.028 |
| Tritanopia (no blue cones) | #00525E | 0.100 |
| Achromatopsia (no color) | #454545 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284188
#284188
oklch(39.7% 0.123 266.3)
- #5A4300
#5A4300
oklch(39.7% 0.081 86.3)
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 #284188, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.022
- Twilight Blue #0A437A ΔE 0.035
- Light Navy #155084 ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.046
- Blueberry #464196 ΔE 0.048
- Dusk Blue #26538D ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.059
- Sapphire #2138AB ΔE 0.063
Use #284188 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.