#1B5376
Closest named color: Deep Sea Blue (#015482). oklch(42.3% 0.082 240.4), rgb(27, 83, 118).
Aa
White text reads best on this color (8.24:1).
About this color
#1B5376 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.082 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.021 away. White text reads best on it, at 8.24:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.54:1 |
| White text | 8.24:1 |
Values
| HEX | #1B5376 |
| RGB | rgb(27, 83, 118) |
| HSL | hsl(203, 63%, 28%) |
| OKLCH | oklch(42.3% 0.082 240.4) |
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 #1B5376 | 8.24:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #1B5376 | 2.54:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #1B5376 text on white | 8.24:1 | AAA | Lc 88.2 | Fine for body text |
| #1B5376 text on black | 2.54:1 | Fails | Lc -13.9 | 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
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE9
oklch(88.5% 0.026 239.1)
-
Step 300
300
#A6C5DD
oklch(80.9% 0.048 241.5)
-
Step 400
400
#74A7CC
oklch(70.6% 0.077 240.7)
-
Step 500
500
#4D91BF
oklch(63.1% 0.098 240.3)
-
Step 600
600
#2D7AAB
oklch(55.5% 0.106 240.7)
-
Step 700
700
#1F6793
oklch(49.1% 0.099 240.5)
-
Step 800
800 (this color)
#1B5376
oklch(42.3% 0.082 240.4)
-
Step 900
900
#1E4660
oklch(37.8% 0.063 239.9)
-
Step 950
950
#132938
oklch(27% 0.04 240.2)
#1B5376 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) | #435378 | 0.042 |
| Deuteranopia (no green cones) | #364B75 | 0.033 |
| Tritanopia (no blue cones) | #005C5F | 0.056 |
| Achromatopsia (no color) | #4F4F4F | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5376
#1B5376
oklch(42.3% 0.082 240.4)
- #6E4219
#6E4219
oklch(42.3% 0.082 60.2)
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 #1B5376, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.021
- Light Navy #155084 ΔE 0.027
- Light Navy Blue #2E5A88 ΔE 0.040
- Dusk Blue #26538D ΔE 0.041
- YInMn Blue #415A77 ΔE 0.047
- Petrol #005F6A ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.053
- Deep Teal #00555A ΔE 0.053
Use #1B5376 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.