#1B203A
Closest named color: Oxford Blue (#1B263B). oklch(25.3% 0.05 274.1), rgb(27, 32, 58).
Aa
White text reads best on this color (15.97:1).
About this color
#1B203A is a dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.050 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.020 away. White text reads best on it, at 15.97:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.31:1 |
| White text | 15.97:1 |
Values
| HEX | #1B203A |
| RGB | rgb(27, 32, 58) |
| HSL | hsl(230, 36%, 17%) |
| OKLCH | oklch(25.3% 0.05 274.1) |
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 #1B203A | 15.97:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #1B203A | 1.31:1 | Fails | Lc 0.0 | Not readable |
| #1B203A text on white | 15.97:1 | AAA | Lc 102.9 | Preferred for body text |
| #1B203A text on black | 1.31:1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8EF
oklch(88.5% 0.032 274.1)
-
Step 300
300
#B4BFE7
oklch(81% 0.058 273)
-
Step 400
400
#8E9CDC
oklch(70.6% 0.095 274.2)
-
Step 500
500
#7383D2
oklch(63.1% 0.12 273.8)
-
Step 600
600
#5D6BBF
oklch(55.7% 0.131 274.3)
-
Step 700
700
#4C59A5
oklch(49.1% 0.122 273.8)
-
Step 800
800
#3F4985
oklch(42.7% 0.1 274.3)
-
Step 900
900
#353D6B
oklch(37.6% 0.079 274.5)
-
Step 950
950 (this color)
#1B203A
oklch(25.3% 0.05 274.1)
#1B203A 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) | #16233B | 0.011 |
| Deuteranopia (no green cones) | #142039 | 0.011 |
| Tritanopia (no blue cones) | #10252A | 0.043 |
| Achromatopsia (no color) | #222222 | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B203A
#1B203A
oklch(25.3% 0.05 274.1)
- #2A2202
#2A2202
oklch(25.4% 0.049 95.1)
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 #1B203A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.020
- Dark #1B2431 ΔE 0.025
- Rich Black #0D1B2A ΔE 0.041
- Jet #212529 ΔE 0.042
- Space Cadet #2B2D42 ΔE 0.054
- Gunmetal #293241 ΔE 0.066
- Navy Blue #001146 ΔE 0.069
- Dark Indigo #1F0954 ΔE 0.075
Use #1B203A 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.