#1B1E40
Closest named color: Oxford Blue (#1B263B). oklch(25.2% 0.064 277), rgb(27, 30, 64).
Aa
White text reads best on this color (16.07:1).
About this color
#1B1E40 is a dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.064 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.030 away. White text reads best on it, at 16.07:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.30:1 |
| White text | 16.07:1 |
Values
| HEX | #1B1E40 |
| RGB | rgb(27, 30, 64) |
| HSL | hsl(235, 41%, 18%) |
| OKLCH | oklch(25.2% 0.064 277) |
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 #1B1E40 | 16.07:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #1B1E40 | 1.30:1 | Fails | Lc 0.0 | Not readable |
| #1B1E40 text on white | 16.07:1 | AAA | Lc 102.9 | Preferred for body text |
| #1B1E40 text on black | 1.30:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D2D7F5
oklch(88.5% 0.042 278)
-
Step 300
300
#B4BDF2
oklch(81% 0.076 277.1)
-
Step 400
400
#8E99EB
oklch(70.8% 0.12 277)
-
Step 500
500
#747DE5
oklch(63.1% 0.155 277.3)
-
Step 600
600
#5E64D3
oklch(55.7% 0.168 277.1)
-
Step 700
700
#4E52B6
oklch(49.1% 0.155 277.3)
-
Step 800
800
#3F4494
oklch(42.7% 0.129 276.7)
-
Step 900
900
#353A76
oklch(37.7% 0.101 276.8)
-
Step 950
950 (this color)
#1B1E40
oklch(25.2% 0.064 277)
#1B1E40 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) | #0F2341 | 0.021 |
| Deuteranopia (no green cones) | #0C203F | 0.021 |
| Tritanopia (no blue cones) | #0C252B | 0.056 |
| Achromatopsia (no color) | #212121 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1E40
#1B1E40
oklch(25.2% 0.064 277)
- #292200
#292200
oklch(25.2% 0.052 97.8)
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 #1B1E40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.030
- Dark #1B2431 ΔE 0.039
- Rich Black #0D1B2A ΔE 0.049
- Jet #212529 ΔE 0.056
- Space Cadet #2B2D42 ΔE 0.059
- Navy Blue #001146 ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.061
- Marine #042E60 ΔE 0.071
Use #1B1E40 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.