#1B57A0
Closest named color: Dusk Blue (#26538D). oklch(46% 0.133 255.8), rgb(27, 87, 160).
Aa
White text reads best on this color (7.19:1).
About this color
#1B57A0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.133 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.031 away. White text reads best on it, at 7.19:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.91:1 |
| White text | 7.19:1 |
Values
| HEX | #1B57A0 |
| RGB | rgb(27, 87, 160) |
| HSL | hsl(213, 71%, 37%) |
| OKLCH | oklch(46% 0.133 255.8) |
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 #1B57A0 | 7.19:1 | AAA | Lc -89.5 | Fine for body text |
| Black text on #1B57A0 | 2.91:1 | Fails | Lc 19.5 | Dividers and decoration only |
| #1B57A0 text on white | 7.19:1 | AAA | Lc 84.5 | Fine for body text |
| #1B57A0 text on black | 2.91:1 | Fails | Lc -17.5 | Dividers and decoration only |
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 700.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADBF1
oklch(88.6% 0.035 254.9)
-
Step 300
300
#A6C3EA
oklch(80.9% 0.064 255.9)
-
Step 400
400
#75A3E0
oklch(70.7% 0.103 255.8)
-
Step 500
500
#508BD7
oklch(63.1% 0.131 255.5)
-
Step 600
600
#3373C5
oklch(55.6% 0.143 256)
-
Step 700
700 (this color)
#1B57A0
oklch(46% 0.133 255.8)
-
Step 800
800
#204F8A
oklch(42.7% 0.11 255.7)
-
Step 900
900
#20426E
oklch(37.7% 0.086 255.8)
-
Step 950
950
#132740
oklch(27% 0.054 254.9)
#1B57A0 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) | #305EA3 | 0.028 |
| Deuteranopia (no green cones) | #12529F | 0.016 |
| Tritanopia (no blue cones) | #006873 | 0.100 |
| Achromatopsia (no color) | #575757 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B57A0
#1B57A0
oklch(46% 0.133 255.8)
- #774F00
#774F00
oklch(46.1% 0.097 75.4)
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 #1B57A0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.031
- Denim Blue #3B5B92 ΔE 0.039
- Light Navy Blue #2E5A88 ΔE 0.044
- Cobalt #1E488F ΔE 0.048
- Light Navy #155084 ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.052
- Peacock Blue #016795 ΔE 0.053
- Dusky Blue #475F94 ΔE 0.055
Use #1B57A0 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.