#283F61
Closest named color: Dark Grey Blue (#29465B). oklch(36.6% 0.066 258), rgb(40, 63, 97).
Aa
White text reads best on this color (10.63:1).
About this color
#283F61 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.066 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.027 away. White text reads best on it, at 10.63:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.63:1 |
Values
| HEX | #283F61 |
| RGB | rgb(40, 63, 97) |
| HSL | hsl(216, 42%, 27%) |
| OKLCH | oklch(36.6% 0.066 258) |
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 #283F61 | 10.63:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #283F61 | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #283F61 text on white | 10.63:1 | AAA | Lc 94.6 | Preferred for body text |
| #283F61 text on black | 1.97:1 | Fails | Lc -8.0 | 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 900.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAEC
oklch(88.5% 0.028 258.4)
-
Step 300
300
#ADC2E1
oklch(80.8% 0.05 258)
-
Step 400
400
#82A2D2
oklch(70.6% 0.079 258.3)
-
Step 500
500
#628BC6
oklch(63.2% 0.1 257.5)
-
Step 600
600
#4974B3
oklch(55.7% 0.11 257.9)
-
Step 700
700
#3A619A
oklch(49.1% 0.102 257.8)
-
Step 800
800
#304F7D
oklch(42.6% 0.085 258.1)
-
Step 900
900 (this color)
#283F61
oklch(36.6% 0.066 258)
-
Step 950
950
#19273B
oklch(27% 0.042 257.3)
#283F61 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) | #314162 | 0.014 |
| Deuteranopia (no green cones) | #2A3C60 | 0.009 |
| Tritanopia (no blue cones) | #05474B | 0.060 |
| Achromatopsia (no color) | #3E3E3E | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283F61
#283F61
oklch(36.6% 0.066 258)
- #513A0F
#513A0F
oklch(36.6% 0.066 79.2)
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 #283F61, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.027
- Charcoal #264653 ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.038
- Dark Blue Grey #1F3B4D ΔE 0.038
- Marine Blue #01386A ΔE 0.045
- Twilight Blue #0A437A ΔE 0.046
- Midnight Green #073B4C ΔE 0.051
- Onyx #343A40 ΔE 0.057
Use #283F61 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.