#0557A1
Closest named color: Dusk Blue (#26538D). oklch(45.7% 0.138 253.1), rgb(5, 87, 161).
Aa
White text reads best on this color (7.28:1).
About this color
#0557A1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.138 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.035 away. White text reads best on it, at 7.28:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.88:1 |
| White text | 7.28:1 |
Values
| HEX | #0557A1 |
| RGB | rgb(5, 87, 161) |
| HSL | hsl(208, 94%, 33%) |
| OKLCH | oklch(45.7% 0.138 253.1) |
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 #0557A1 | 7.28:1 | AAA | Lc -89.6 | Fine for body text |
| Black text on #0557A1 | 2.88:1 | Fails | Lc 19.4 | Dividers and decoration only |
| #0557A1 text on white | 7.28:1 | AAA | Lc 84.6 | Fine for body text |
| #0557A1 text on black | 2.88:1 | Fails | Lc -17.3 | 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 800.
-
Step 50
50
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DCF7
oklch(88.6% 0.045 252.5)
-
Step 300
300
#9CC4F4
oklch(80.9% 0.081 253.3)
-
Step 400
400
#63A4EF
oklch(70.7% 0.129 253.1)
-
Step 500
500
#318BEA
oklch(63.2% 0.166 253.1)
-
Step 600
600
#0073D4
oklch(55.6% 0.172 253.1)
-
Step 700
700
#0060B3
oklch(49% 0.152 253.2)
-
Step 800
800 (this color)
#0557A1
oklch(45.7% 0.138 253.1)
-
Step 900
900
#0A4279
oklch(37.8% 0.108 253.1)
-
Step 950
950
#0A2747
oklch(27.1% 0.069 253.6)
#0557A1 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) | #2E5DA4 | 0.032 |
| Deuteranopia (no green cones) | #0451A0 | 0.017 |
| Tritanopia (no blue cones) | #006974 | 0.102 |
| Achromatopsia (no color) | #575757 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0557A1
#0557A1
oklch(45.7% 0.138 253.1)
- #774D00
#774D00
oklch(45.6% 0.097 73.3)
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 #0557A1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.047
- Cobalt #1E488F ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.048
- Light Navy #155084 ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.051
- Peacock Blue #016795 ΔE 0.054
- Dusky Blue #475F94 ΔE 0.063
Use #0557A1 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.