#1B5673
Closest named color: Deep Sea Blue (#015482). oklch(42.9% 0.076 234.2), rgb(27, 86, 115).
Aa
White text reads best on this color (7.99:1).
About this color
#1B5673 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.076 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.029 away. White text reads best on it, at 7.99:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.62:1 |
| White text | 7.99:1 |
Values
| HEX | #1B5673 |
| RGB | rgb(27, 86, 115) |
| HSL | hsl(200, 62%, 28%) |
| OKLCH | oklch(42.9% 0.076 234.2) |
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 #1B5673 | 7.99:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #1B5673 | 2.62:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #1B5673 text on white | 7.99:1 | AAA | Lc 87.4 | Fine for body text |
| #1B5673 text on black | 2.62:1 | Fails | Lc -14.7 | 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 800.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CADCE7
oklch(88.4% 0.025 234.5)
-
Step 300
300
#A5C6D9
oklch(80.9% 0.044 233.3)
-
Step 400
400
#73A8C7
oklch(70.6% 0.072 234.9)
-
Step 500
500
#4C92B8
oklch(63% 0.091 234.5)
-
Step 600
600
#2A7CA4
oklch(55.5% 0.099 234.1)
-
Step 700
700
#1B688D
oklch(49% 0.093 234.8)
-
Step 800
800 (this color)
#1B5673
oklch(42.9% 0.076 234.2)
-
Step 900
900
#1D475C
oklch(37.8% 0.059 233.1)
-
Step 950
950
#122936
oklch(26.9% 0.038 235.3)
#1B5673 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) | #485574 | 0.048 |
| Deuteranopia (no green cones) | #3C4D73 | 0.040 |
| Tritanopia (no blue cones) | #005E60 | 0.048 |
| Achromatopsia (no color) | #515151 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5673
#1B5673
oklch(42.9% 0.076 234.2)
- #704324
#704324
oklch(42.9% 0.077 53.7)
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 #1B5673, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.029
- Petrol #005F6A ΔE 0.037
- Light Navy #155084 ΔE 0.038
- Light Navy Blue #2E5A88 ΔE 0.041
- YInMn Blue #415A77 ΔE 0.042
- Deep Teal #00555A ΔE 0.046
- Dusk Blue #26538D ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.056
Use #1B5673 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.