#1B273A
Closest named color: Oxford Blue (#1B263B). oklch(27.1% 0.039 259.4), rgb(27, 39, 58).
Aa
White text reads best on this color (15.02:1).
About this color
#1B273A is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.039 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.004 away. White text reads best on it, at 15.02:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.39:1 |
| White text | 15.02:1 |
Values
| HEX | #1B273A |
| RGB | rgb(27, 39, 58) |
| HSL | hsl(217, 36%, 17%) |
| OKLCH | oklch(27.1% 0.039 259.4) |
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 #1B273A | 15.02:1 | AAA | Lc -104.6 | Preferred for body text |
| Black text on #1B273A | 1.39:1 | Fails | Lc 0.0 | Not readable |
| #1B273A text on white | 15.02:1 | AAA | Lc 101.9 | Preferred for body text |
| #1B273A text on black | 1.39:1 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AFC2DF
oklch(80.9% 0.046 258.8)
-
Step 400
400
#85A2D0
oklch(70.7% 0.075 259.5)
-
Step 500
500
#668AC3
oklch(63% 0.096 259.3)
-
Step 600
600
#4E73B0
oklch(55.6% 0.104 260)
-
Step 700
700
#3E6197
oklch(49.2% 0.096 258.8)
-
Step 800
800
#344F7A
oklch(42.7% 0.079 259.4)
-
Step 900
900
#2D4263
oklch(37.7% 0.063 259.2)
-
Step 950
950 (this color)
#1B273A
oklch(27.1% 0.039 259.4)
#1B273A 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) | #20283B | 0.009 |
| Deuteranopia (no green cones) | #1C253A | 0.007 |
| Tritanopia (no blue cones) | #0F2B2E | 0.034 |
| Achromatopsia (no color) | #272727 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B273A
#1B273A
oklch(27.1% 0.039 259.4)
- #31240F
#31240F
oklch(27% 0.039 77.9)
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 #1B273A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.004
- Dark #1B2431 ΔE 0.018
- Jet #212529 ΔE 0.031
- Space Cadet #2B2D42 ΔE 0.036
- Gunmetal #293241 ΔE 0.045
- Rich Black #0D1B2A ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.063
- Midnight Green #073B4C ΔE 0.067
Use #1B273A 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.