#557BAC
Closest named color: Steel Blue (#4682B4). oklch(57.5% 0.087 255.2), rgb(85, 123, 172).
Aa
Black text reads best on this color (4.81:1).
About this color
#557BAC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.087 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.023 away. Black text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.81:1 |
| White text | 4.36:1 |
Values
| HEX | #557BAC |
| RGB | rgb(85, 123, 172) |
| HSL | hsl(214, 34%, 50%) |
| OKLCH | oklch(57.5% 0.087 255.2) |
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 #557BAC | 4.36:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #557BAC | 4.81:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #557BAC text on white | 4.36:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #557BAC text on black | 4.81:1 | AA | Lc -31.5 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D0DAE8
oklch(88.5% 0.022 256.7)
-
Step 300
300
#B0C2DA
oklch(80.8% 0.039 255.6)
-
Step 400
400
#87A3C8
oklch(70.8% 0.063 255.5)
-
Step 500
500
#688CBA
oklch(63.2% 0.081 254.9)
-
Step 600
600 (this color)
#557BAC
oklch(57.5% 0.087 255.2)
-
Step 700
700
#40628E
oklch(49% 0.081 255.3)
-
Step 800
800
#355073
oklch(42.6% 0.067 255.3)
-
Step 900
900
#2E435D
oklch(37.7% 0.052 254.2)
-
Step 950
950
#1B2737
oklch(26.9% 0.034 255.8)
#557BAC 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) | #687EAE | 0.026 |
| Deuteranopia (no green cones) | #5D75AB | 0.018 |
| Tritanopia (no blue cones) | #2C868C | 0.077 |
| Achromatopsia (no color) | #797979 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557BAC
#557BAC
oklch(57.5% 0.087 255.2)
- #977139
#977139
oklch(57.5% 0.088 75.1)
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 #557BAC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.023
- Off Blue #5684AE ΔE 0.026
- Stormy Blue #507B9C ΔE 0.027
- Cool Blue #4984B8 ΔE 0.028
- Cerulean #457B9D ΔE 0.031
- Dull Blue #49759C ΔE 0.032
- Dusty Blue #5A86AD ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.037
Use #557BAC 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.