#557D9B
Closest named color: Stormy Blue (#507B9C). oklch(57.2% 0.065 241.7), rgb(85, 125, 155).
Aa
Black text reads best on this color (4.79:1).
About this color
#557D9B is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.065 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.009 away. Black text reads best on it, at 4.79:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.79:1 |
| White text | 4.38:1 |
Values
| HEX | #557D9B |
| RGB | rgb(85, 125, 155) |
| HSL | hsl(206, 29%, 47%) |
| OKLCH | oklch(57.2% 0.065 241.7) |
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 #557D9B | 4.38:1 | AA large text | Lc -75.8 | Fine for body text |
| Black text on #557D9B | 4.79:1 | AA | Lc 33.8 | Non-text elements, placeholder text |
| #557D9B text on white | 4.38:1 | AA large text | Lc 70.3 | Content text, not long reading |
| #557D9B text on black | 4.79:1 | AA | Lc -31.4 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#D0DBE3
oklch(88.5% 0.016 239.1)
-
Step 300
300
#B1C3D2
oklch(80.8% 0.029 243.2)
-
Step 400
400
#88A5BB
oklch(70.8% 0.046 241)
-
Step 500
500
#698EAB
oklch(63% 0.06 242.5)
-
Step 600
600 (this color)
#557D9B
oklch(57.2% 0.065 241.7)
-
Step 700
700
#416580
oklch(49.1% 0.06 241.9)
-
Step 800
800
#365368
oklch(42.8% 0.049 240.8)
-
Step 900
900
#2F4455
oklch(37.6% 0.039 243.5)
-
Step 950
950
#1C2831
oklch(27% 0.024 241.1)
#557D9B 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) | #707D9C | 0.034 |
| Deuteranopia (no green cones) | #67759A | 0.030 |
| Tritanopia (no blue cones) | #388487 | 0.052 |
| Achromatopsia (no color) | #797979 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557D9B
#557D9B
oklch(57.2% 0.065 241.7)
- #946F50
#946F50
oklch(57.1% 0.065 60.9)
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 #557D9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.009
- Cerulean #457B9D ΔE 0.019
- Grey Blue #647D8E ΔE 0.026
- Dull Blue #49759C ΔE 0.029
- Off Blue #5684AE ΔE 0.032
- Metallic Blue #4F738E ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.035
- Steel Blue #4682B4 ΔE 0.039
Use #557D9B 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.