#284177
Closest named color: Twilight Blue (#0A437A). oklch(38.5% 0.097 263.8), rgb(40, 65, 119).
Aa
White text reads best on this color (9.93:1).
About this color
#284177 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.097 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 9.93:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.11:1 |
| White text | 9.93:1 |
Values
| HEX | #284177 |
| RGB | rgb(40, 65, 119) |
| HSL | hsl(221, 50%, 31%) |
| OKLCH | oklch(38.5% 0.097 263.8) |
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 #284177 | 9.93:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #284177 | 2.11:1 | Fails | Lc 11.1 | Not readable |
| #284177 text on white | 9.93:1 | AAA | Lc 92.8 | Preferred for body text |
| #284177 text on black | 2.11:1 | Fails | Lc -9.6 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF5
oklch(88.6% 0.04 263.7)
-
Step 300
300
#A9C1F1
oklch(81% 0.073 264)
-
Step 400
400
#7B9FE9
oklch(70.6% 0.116 263.9)
-
Step 500
500
#5A85E3
oklch(63% 0.15 264.1)
-
Step 600
600
#406DD1
oklch(55.6% 0.162 263.7)
-
Step 700
700
#325AB5
oklch(49% 0.151 263.8)
-
Step 800
800
#2A4A92
oklch(42.6% 0.125 263.9)
-
Step 900
900 (this color)
#284177
oklch(38.5% 0.097 263.8)
-
Step 950
950
#172544
oklch(27% 0.061 264.4)
#284177 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) | #284779 | 0.018 |
| Deuteranopia (no green cones) | #1B3F76 | 0.016 |
| Tritanopia (no blue cones) | #004D56 | 0.081 |
| Achromatopsia (no color) | #434343 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284177
#284177
oklch(38.5% 0.097 263.8)
- #583F00
#583F00
oklch(38.5% 0.079 83.1)
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 #284177, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Cobalt #1E488F ΔE 0.042
- Light Navy #155084 ΔE 0.046
- Marine Blue #01386A ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.059
- Dusk Blue #26538D ΔE 0.059
Use #284177 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.