#577CA3
Closest named color: Stormy Blue (#507B9C). oklch(57.5% 0.074 250.5), rgb(87, 124, 163).
Aa
Black text reads best on this color (4.81:1).
About this color
#577CA3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.074 and its hue 250°. 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 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.81:1 |
| White text | 4.35:1 |
Values
| HEX | #577CA3 |
| RGB | rgb(87, 124, 163) |
| HSL | hsl(211, 30%, 49%) |
| OKLCH | oklch(57.5% 0.074 250.5) |
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 #577CA3 | 4.35:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #577CA3 | 4.81:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #577CA3 text on white | 4.35:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #577CA3 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EAF0
oklch(93.5% 0.01 252.8)
-
Step 200
200
#D0DAE5
oklch(88.4% 0.019 250.6)
-
Step 300
300
#B1C3D6
oklch(81% 0.033 249.7)
-
Step 400
400
#88A4C1
oklch(70.8% 0.053 249.5)
-
Step 500
500
#6A8DB1
oklch(63.1% 0.067 249.6)
-
Step 600
600 (this color)
#577CA3
oklch(57.5% 0.074 250.5)
-
Step 700
700
#426386
oklch(49% 0.068 250.8)
-
Step 800
800
#37516D
oklch(42.6% 0.057 251)
-
Step 900
900
#304358
oklch(37.6% 0.044 251.5)
-
Step 950
950
#1C2834
oklch(27.1% 0.028 248.9)
#577CA3 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) | #6D7DA5 | 0.029 |
| Deuteranopia (no green cones) | #6376A2 | 0.021 |
| Tritanopia (no blue cones) | #378589 | 0.064 |
| Achromatopsia (no color) | #797979 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577CA3
#577CA3
oklch(57.5% 0.074 250.5)
- #957147
#957147
oklch(57.5% 0.074 69.8)
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 #577CA3, 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 0.023
- Off Blue #5684AE ΔE 0.025
- Dull Blue #49759C ΔE 0.028
- Steel Blue #4682B4 ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.030
- Cool Blue #4984B8 ΔE 0.035
- Grey Blue #647D8E ΔE 0.036
Use #577CA3 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.