#283758
Closest named color: Prussian Blue (#1D3557). oklch(34% 0.062 264.8), rgb(40, 55, 88).
Aa
White text reads best on this color (11.81:1).
About this color
#283758 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.062 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.016 away. White text reads best on it, at 11.81:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.77:1 |
| White text | 11.81:1 |
Values
| HEX | #283758 |
| RGB | rgb(40, 55, 88) |
| HSL | hsl(221, 38%, 25%) |
| OKLCH | oklch(34% 0.062 264.8) |
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 #283758 | 11.81:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #283758 | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #283758 text on white | 11.81:1 | AAA | Lc 97.0 | Preferred for body text |
| #283758 text on black | 1.77:1 | 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
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D1D9EB
oklch(88.5% 0.026 266.6)
-
Step 300
300
#B2C1DF
oklch(80.9% 0.046 264.3)
-
Step 400
400
#8AA0D0
oklch(70.7% 0.075 265.4)
-
Step 500
500
#6D88C3
oklch(63% 0.095 265)
-
Step 600
600
#5571B0
oklch(55.5% 0.104 265)
-
Step 700
700
#455F97
oklch(49.1% 0.096 264.3)
-
Step 800
800
#394E7A
oklch(42.8% 0.078 264)
-
Step 900
900 (this color)
#283758
oklch(34% 0.062 264.8)
-
Step 950
950
#1D263A
oklch(27% 0.04 265.3)
#283758 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) | #2A3A59 | 0.010 |
| Deuteranopia (no green cones) | #253657 | 0.006 |
| Tritanopia (no blue cones) | #123E43 | 0.055 |
| Achromatopsia (no color) | #383838 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283758
#283758
oklch(34% 0.062 264.8)
- #47350B
#47350B
oklch(34.1% 0.062 84.3)
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 #283758, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.016
- Dark Blue Grey #1F3B4D ΔE 0.029
- Gunmetal #293241 ΔE 0.041
- Midnight Green #073B4C ΔE 0.042
- Marine Blue #01386A ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.048
- Onyx #343A40 ΔE 0.049
Use #283758 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.