#557FA0
Closest named color: Stormy Blue (#507B9C). oklch(57.9% 0.069 243), rgb(85, 127, 160).
Aa
Black text reads best on this color (4.92:1).
About this color
#557FA0 is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.069 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.014 away. Black text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.92:1 |
| White text | 4.25:1 |
Values
| HEX | #557FA0 |
| RGB | rgb(85, 127, 160) |
| HSL | hsl(206, 31%, 48%) |
| OKLCH | oklch(57.9% 0.069 243) |
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 #557FA0 | 4.25:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #557FA0 | 4.92:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #557FA0 text on white | 4.25:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #557FA0 text on black | 4.92:1 | AA | Lc -32.3 | 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
#D0DBE4
oklch(88.6% 0.017 242.5)
-
Step 300
300
#B0C3D4
oklch(80.8% 0.032 245.2)
-
Step 400
400
#86A5BE
oklch(70.7% 0.05 242.8)
-
Step 500
500
#688EAD
oklch(63% 0.063 243.6)
-
Step 600
600 (this color)
#557FA0
oklch(57.9% 0.069 243)
-
Step 700
700
#3F6583
oklch(49.1% 0.065 243.5)
-
Step 800
800
#34526A
oklch(42.6% 0.054 243.6)
-
Step 900
900
#2E4456
oklch(37.6% 0.041 243.9)
-
Step 950
950
#1B2832
oklch(27% 0.026 242)
#557FA0 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) | #717FA2 | 0.035 |
| Deuteranopia (no green cones) | #67779F | 0.030 |
| Tritanopia (no blue cones) | #34878A | 0.057 |
| Achromatopsia (no color) | #7B7B7B | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557FA0
#557FA0
oklch(57.9% 0.069 243)
- #97714E
#97714E
oklch(57.8% 0.069 63.4)
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 #557FA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.014
- Cerulean #457B9D ΔE 0.022
- Off Blue #5684AE ΔE 0.023
- Dusty Blue #5A86AD ΔE 0.026
- Grey Blue #647D8E ΔE 0.030
- Steel Blue #4682B4 ΔE 0.032
- Dull Blue #49759C ΔE 0.034
- Cool Blue #4984B8 ΔE 0.037
Use #557FA0 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.