#283A61
Closest named color: Prussian Blue (#1D3557). oklch(35.3% 0.072 264.3), rgb(40, 58, 97).
Aa
White text reads best on this color (11.24:1).
About this color
#283A61 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.072 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.027 away. White text reads best on it, at 11.24:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.86:1 |
| White text | 11.24:1 |
Values
| HEX | #283A61 |
| RGB | rgb(40, 58, 97) |
| HSL | hsl(221, 42%, 27%) |
| OKLCH | oklch(35.3% 0.072 264.3) |
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 #283A61 | 11.24:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #283A61 | 1.86:1 | Fails | Lc 8.1 | Not readable |
| #283A61 text on white | 11.24:1 | AAA | Lc 95.8 | Preferred for body text |
| #283A61 text on black | 1.86:1 | Fails | Lc 0.0 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#CFD9EE
oklch(88.4% 0.031 265.3)
-
Step 300
300
#AFC1E4
oklch(80.9% 0.053 263.7)
-
Step 400
400
#85A0D7
oklch(70.6% 0.087 264.1)
-
Step 500
500
#6788CD
oklch(63.2% 0.111 264)
-
Step 600
600
#4F70B9
oklch(55.5% 0.12 264.5)
-
Step 700
700
#405EA0
oklch(49.1% 0.112 264.3)
-
Step 800
800
#354D82
oklch(42.8% 0.093 264.4)
-
Step 900
900 (this color)
#283A61
oklch(35.3% 0.072 264.3)
-
Step 950
950
#1B263D
oklch(27% 0.046 264.1)
#283A61 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) | #2A3E63 | 0.013 |
| Deuteranopia (no green cones) | #233860 | 0.010 |
| Tritanopia (no blue cones) | #074348 | 0.066 |
| Achromatopsia (no color) | #3B3B3B | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283A61
#283A61
oklch(35.3% 0.072 264.3)
- #4D3701
#4D3701
oklch(35.2% 0.072 83.3)
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 #283A61, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.027
- Marine Blue #01386A ΔE 0.037
- Dark Blue Grey #1F3B4D ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.043
- Twilight Blue #0A437A ΔE 0.049
- Midnight Green #073B4C ΔE 0.051
- Charcoal #264653 ΔE 0.051
- Marine #042E60 ΔE 0.055
Use #283A61 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.