#1B557E
Closest named color: Deep Sea Blue (#015482). oklch(43.3% 0.09 243.8), rgb(27, 85, 126).
Aa
White text reads best on this color (7.93:1).
About this color
#1B557E is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.090 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.014 away. White text reads best on it, at 7.93:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.64:1 |
| White text | 7.93:1 |
Values
| HEX | #1B557E |
| RGB | rgb(27, 85, 126) |
| HSL | hsl(205, 65%, 30%) |
| OKLCH | oklch(43.3% 0.09 243.8) |
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 #1B557E | 7.93:1 | AAA | Lc -91.9 | Preferred for body text |
| Black text on #1B557E | 2.64:1 | Fails | Lc 16.8 | Dividers and decoration only |
| #1B557E text on white | 7.93:1 | AAA | Lc 87.2 | Fine for body text |
| #1B557E text on black | 2.64:1 | Fails | Lc -14.9 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A4C5E1
oklch(80.9% 0.053 244.1)
-
Step 400
400
#72A7D1
oklch(70.7% 0.083 243.2)
-
Step 500
500
#4A90C5
oklch(63.1% 0.107 243.5)
-
Step 600
600
#2979B2
oklch(55.5% 0.117 244.1)
-
Step 700
700
#1A6699
oklch(49.1% 0.108 243.7)
-
Step 800
800 (this color)
#1B557E
oklch(43.3% 0.09 243.8)
-
Step 900
900
#1C4564
oklch(37.7% 0.07 244.2)
-
Step 950
950
#12293A
oklch(27.1% 0.043 242.6)
#1B557E 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) | #425680 | 0.040 |
| Deuteranopia (no green cones) | #344D7D | 0.030 |
| Tritanopia (no blue cones) | #005F64 | 0.062 |
| Achromatopsia (no color) | #515151 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B557E
#1B557E
oklch(43.3% 0.09 243.8)
- #72440F
#72440F
oklch(43.2% 0.09 63.8)
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 #1B557E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.014
- Light Navy #155084 ΔE 0.021
- Light Navy Blue #2E5A88 ΔE 0.028
- Dusk Blue #26538D ΔE 0.029
- YInMn Blue #415A77 ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.049
- Cobalt #1E488F ΔE 0.052
- Petrol #005F6A ΔE 0.053
Use #1B557E 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.