#1B1F45
Closest named color: Oxford Blue (#1B263B). oklch(25.9% 0.07 275.8), rgb(27, 31, 69).
Aa
White text reads best on this color (15.80:1).
About this color
#1B1F45 is a dark, moderately saturated blue. In OKLCH its lightness is 26%, its chroma 0.070 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.033 away. White text reads best on it, at 15.80:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.32:1 |
| White text | 15.80:1 |
Values
| HEX | #1B1F45 |
| RGB | rgb(27, 31, 69) |
| HSL | hsl(234, 44%, 19%) |
| OKLCH | oklch(25.9% 0.07 275.8) |
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 #1B1F45 | 15.80:1 | AAA | Lc -105.3 | Preferred for body text |
| Black text on #1B1F45 | 1.32:1 | Fails | Lc 0.0 | Not readable |
| #1B1F45 text on white | 15.80:1 | AAA | Lc 102.6 | Preferred for body text |
| #1B1F45 text on black | 1.32:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D0D7F8
oklch(88.4% 0.046 276)
-
Step 300
300
#B1BDF7
oklch(81% 0.083 275.3)
-
Step 400
400
#8A98F3
oklch(70.7% 0.134 275.8)
-
Step 500
500
#6F7CEE
oklch(63.1% 0.17 275.5)
-
Step 600
600
#5961DD
oklch(55.5% 0.186 275.7)
-
Step 700
700
#4A50C0
oklch(49.2% 0.172 275.7)
-
Step 800
800
#3C429B
oklch(42.7% 0.143 275.6)
-
Step 900
900
#33397B
oklch(37.7% 0.111 275.8)
-
Step 950
950 (this color)
#1B1F45
oklch(25.9% 0.07 275.8)
#1B1F45 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) | #0D2446 | 0.022 |
| Deuteranopia (no green cones) | #072144 | 0.025 |
| Tritanopia (no blue cones) | #07272E | 0.062 |
| Achromatopsia (no color) | #232323 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1F45
#1B1F45
oklch(25.9% 0.07 275.8)
- #2B2300
#2B2300
oklch(25.8% 0.053 96.3)
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 #1B1F45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.033
- Dark #1B2431 ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.057
- Dark Indigo #1F0954 ΔE 0.057
- Rich Black #0D1B2A ΔE 0.058
- Navy Blue #001146 ΔE 0.061
- Jet #212529 ΔE 0.062
- Marine #042E60 ΔE 0.063
Use #1B1F45 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.