#283C57
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.2% 0.054 256.2), rgb(40, 60, 87).
Aa
White text reads best on this color (11.20:1).
About this color
#283C57 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.054 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.022 away. White text reads best on it, at 11.20:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.87:1 |
| White text | 11.20:1 |
Values
| HEX | #283C57 |
| RGB | rgb(40, 60, 87) |
| HSL | hsl(214, 37%, 25%) |
| OKLCH | oklch(35.2% 0.054 256.2) |
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 #283C57 | 11.20:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #283C57 | 1.87:1 | Fails | Lc 8.1 | Not readable |
| #283C57 text on white | 11.20:1 | AAA | Lc 95.8 | Preferred for body text |
| #283C57 text on black | 1.87:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D0DAE8
oklch(88.5% 0.022 256.7)
-
Step 300
300
#B0C2DB
oklch(80.8% 0.041 256.6)
-
Step 400
400
#86A3C9
oklch(70.7% 0.065 255.3)
-
Step 500
500
#688BBB
oklch(63% 0.083 256.4)
-
Step 600
600
#4F75A7
oklch(55.6% 0.089 255.7)
-
Step 700
700
#406290
oklch(49.1% 0.084 256.3)
-
Step 800
800
#355074
oklch(42.6% 0.069 255.9)
-
Step 900
900 (this color)
#283C57
oklch(35.2% 0.054 256.2)
-
Step 950
950
#1B2737
oklch(26.9% 0.034 255.8)
#283C57 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) | #313D58 | 0.013 |
| Deuteranopia (no green cones) | #2C3956 | 0.010 |
| Tritanopia (no blue cones) | #124245 | 0.048 |
| Achromatopsia (no color) | #3B3B3B | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283C57
#283C57
oklch(35.2% 0.054 256.2)
- #4B3718
#4B3718
oklch(35.2% 0.054 76.4)
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 #283C57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.022
- Prussian Blue #1D3557 ΔE 0.028
- Dark Grey Blue #29465B ΔE 0.032
- Charcoal #264653 ΔE 0.036
- Midnight Green #073B4C ΔE 0.038
- Onyx #343A40 ΔE 0.041
- Gunmetal #293241 ΔE 0.044
- Marine Blue #01386A ΔE 0.050
Use #283C57 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.