#0557A7
Closest named color: Dusk Blue (#26538D). oklch(46.1% 0.146 254.5), rgb(5, 87, 167).
Aa
White text reads best on this color (7.17:1).
About this color
#0557A7 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.146 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.043 away. White text reads best on it, at 7.17:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.92:1 |
| White text | 7.17:1 |
Values
| HEX | #0557A7 |
| RGB | rgb(5, 87, 167) |
| HSL | hsl(210, 94%, 34%) |
| OKLCH | oklch(46.1% 0.146 254.5) |
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 #0557A7 | 7.17:1 | AAA | Lc -89.2 | Fine for body text |
| Black text on #0557A7 | 2.92:1 | Fails | Lc 19.8 | Dividers and decoration only |
| #0557A7 text on white | 7.17:1 | AAA | Lc 84.2 | Fine for body text |
| #0557A7 text on black | 2.92:1 | Fails | Lc -17.8 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF3
oklch(88.5% 0.039 254.3)
-
Step 300
300
#A2C4EE
oklch(81% 0.07 253.9)
-
Step 400
400
#6EA3E6
oklch(70.6% 0.114 254.8)
-
Step 500
500
#458BDE
oklch(63.1% 0.144 254.3)
-
Step 600
600
#2373CC
oklch(55.6% 0.157 254.5)
-
Step 700
700 (this color)
#0557A7
oklch(46.1% 0.146 254.5)
-
Step 800
800
#154F8F
oklch(42.8% 0.121 254.3)
-
Step 900
900
#194272
oklch(37.7% 0.094 254.4)
-
Step 950
950
#102743
oklch(27% 0.06 254.6)
#0557A7 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) | #285FAA | 0.032 |
| Deuteranopia (no green cones) | #0051A5 | 0.017 |
| Tritanopia (no blue cones) | #006B77 | 0.109 |
| Achromatopsia (no color) | #575757 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0557A7
#0557A7
oklch(46.1% 0.146 254.5)
- #784F00
#784F00
oklch(46.2% 0.098 74.7)
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 #0557A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.052
- Cobalt #1E488F ΔE 0.053
- Light Navy Blue #2E5A88 ΔE 0.057
- Light Navy #155084 ΔE 0.058
- Peacock Blue #016795 ΔE 0.059
- Mid Blue #276AB3 ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.061
Use #0557A7 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.