#577EB2
Closest named color: Steel Blue (#4682B4). oklch(58.6% 0.092 255.9), rgb(87, 126, 178).
Aa
Black text reads best on this color (5.03:1).
About this color
#577EB2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.092 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.019 away. Black text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.03:1 |
| White text | 4.17:1 |
Values
| HEX | #577EB2 |
| RGB | rgb(87, 126, 178) |
| HSL | hsl(214, 37%, 52%) |
| OKLCH | oklch(58.6% 0.092 255.9) |
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 #577EB2 | 4.17:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #577EB2 | 5.03:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #577EB2 text on white | 4.17:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #577EB2 text on black | 5.03:1 | AA | Lc -33.0 | 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
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#B0C2DC
oklch(80.9% 0.042 257.5)
-
Step 400
400
#86A3CA
oklch(70.8% 0.066 255.9)
-
Step 500
500
#678CBC
oklch(63.2% 0.084 255.2)
-
Step 600
600 (this color)
#577EB2
oklch(58.6% 0.092 255.9)
-
Step 700
700
#3F6290
oklch(49.1% 0.085 255.7)
-
Step 800
800
#345075
oklch(42.6% 0.071 255.8)
-
Step 900
900
#2E435F
oklch(37.8% 0.055 255.9)
-
Step 950
950
#1B2737
oklch(26.9% 0.034 255.8)
#577EB2 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) | #6A81B4 | 0.026 |
| Deuteranopia (no green cones) | #5E78B1 | 0.018 |
| Tritanopia (no blue cones) | #2B8A90 | 0.082 |
| Achromatopsia (no color) | #7C7C7C | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577EB2
#577EB2
oklch(58.6% 0.092 255.9)
- #9B7438
#9B7438
oklch(58.5% 0.092 76)
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 #577EB2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.019
- Off Blue #5684AE ΔE 0.020
- Cool Blue #4984B8 ΔE 0.020
- Dusty Blue #5A86AD ΔE 0.027
- Stormy Blue #507B9C ΔE 0.036
- Cerulean #457B9D ΔE 0.040
- Windows Blue #3778BF ΔE 0.043
- Dull Blue #49759C ΔE 0.044
Use #577EB2 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.