#1D283F
Closest named color: Oxford Blue (#1B263B). oklch(27.8% 0.045 264.2), rgb(29, 40, 63).
Aa
White text reads best on this color (14.71:1).
About this color
#1D283F is a dark, muted blue. In OKLCH its lightness is 28%, its chroma 0.045 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.010 away. White text reads best on it, at 14.71:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.42:1 |
| White text | 14.71:1 |
Values
| HEX | #1D283F |
| RGB | rgb(29, 40, 63) |
| HSL | hsl(221, 37%, 18%) |
| OKLCH | oklch(27.8% 0.045 264.2) |
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 #1D283F | 14.71:1 | AAA | Lc -104.3 | Preferred for body text |
| Black text on #1D283F | 1.42:1 | Fails | Lc 0.0 | Not readable |
| #1D283F text on white | 14.71:1 | AAA | Lc 101.5 | Preferred for body text |
| #1D283F text on black | 1.42:1 | 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 950.
-
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
#6788CC
oklch(63.1% 0.11 263.8)
-
Step 600
600
#4F71B9
oklch(55.7% 0.119 263.9)
-
Step 700
700
#405EA0
oklch(49.1% 0.112 264.3)
-
Step 800
800
#354D81
oklch(42.7% 0.092 264.2)
-
Step 900
900
#2E4068
oklch(37.6% 0.073 264.8)
-
Step 950
950 (this color)
#1D283F
oklch(27.8% 0.045 264.2)
#1D283F 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) | #1F2A40 | 0.008 |
| Deuteranopia (no green cones) | #1C273E | 0.004 |
| Tritanopia (no blue cones) | #0F2D30 | 0.042 |
| Achromatopsia (no color) | #282828 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D283F
#1D283F
oklch(27.8% 0.045 264.2)
- #33260B
#33260B
oklch(27.7% 0.045 83)
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 #1D283F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.010
- Dark #1B2431 ΔE 0.027
- Space Cadet #2B2D42 ΔE 0.030
- Jet #212529 ΔE 0.040
- Gunmetal #293241 ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.054
- Marine #042E60 ΔE 0.062
- Rich Black #0D1B2A ΔE 0.062
Use #1D283F 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.