#1B253A
Closest named color: Oxford Blue (#1B263B). oklch(26.6% 0.042 264.3), rgb(27, 37, 58).
Aa
White text reads best on this color (15.30:1).
About this color
#1B253A is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.042 and its hue 264°. 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 15.30:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.37:1 |
| White text | 15.30:1 |
Values
| HEX | #1B253A |
| RGB | rgb(27, 37, 58) |
| HSL | hsl(221, 36%, 17%) |
| OKLCH | oklch(26.6% 0.042 264.3) |
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 #1B253A | 15.30:1 | AAA | Lc -104.9 | Preferred for body text |
| Black text on #1B253A | 1.37:1 | Fails | Lc 0.0 | Not readable |
| #1B253A text on white | 15.30:1 | AAA | Lc 102.2 | Preferred for body text |
| #1B253A text on black | 1.37:1 | 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
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D0D9EC
oklch(88.4% 0.028 265.4)
-
Step 300
300
#B1C1E2
oklch(81% 0.05 264.8)
-
Step 400
400
#88A0D3
oklch(70.6% 0.08 264.9)
-
Step 500
500
#6A88C7
oklch(63% 0.102 264.2)
-
Step 600
600
#5271B4
oklch(55.6% 0.111 264.3)
-
Step 700
700
#435E9B
oklch(49% 0.103 264.8)
-
Step 800
800
#374D7E
oklch(42.6% 0.086 264.7)
-
Step 900
900
#304165
oklch(37.8% 0.066 264.2)
-
Step 950
950 (this color)
#1B253A
oklch(26.6% 0.042 264.3)
#1B253A 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) | #1D273B | 0.008 |
| Deuteranopia (no green cones) | #1A243A | 0.004 |
| Tritanopia (no blue cones) | #0F292C | 0.038 |
| Achromatopsia (no color) | #252525 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B253A
#1B253A
oklch(26.6% 0.042 264.3)
- #2F240B
#2F240B
oklch(26.7% 0.042 85.4)
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 #1B253A, 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 0.017
- Jet #212529 ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.041
- Rich Black #0D1B2A ΔE 0.049
- Gunmetal #293241 ΔE 0.051
- Prussian Blue #1D3557 ΔE 0.067
- Marine #042E60 ΔE 0.071
Use #1B253A 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.