#577FA5
Closest named color: Off Blue (#5684AE). oklch(58.2% 0.074 247.9), rgb(87, 127, 165).
Aa
Black text reads best on this color (4.98:1).
About this color
#577FA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.074 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.017 away. Black text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #577FA5 |
| RGB | rgb(87, 127, 165) |
| HSL | hsl(209, 31%, 49%) |
| OKLCH | oklch(58.2% 0.074 247.9) |
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 #577FA5 | 4.21:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #577FA5 | 4.98:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #577FA5 text on white | 4.21:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #577FA5 text on black | 4.98:1 | AA | Lc -32.7 | 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
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#D0DAE5
oklch(88.4% 0.019 250.6)
-
Step 300
300
#B0C3D6
oklch(80.9% 0.034 248.2)
-
Step 400
400
#87A4C1
oklch(70.7% 0.053 248.6)
-
Step 500
500
#688DB1
oklch(63% 0.068 248.3)
-
Step 600
600 (this color)
#577FA5
oklch(58.2% 0.074 247.9)
-
Step 700
700
#406486
oklch(49.1% 0.069 248)
-
Step 800
800
#35526D
oklch(42.8% 0.057 247.6)
-
Step 900
900
#2E4458
oklch(37.7% 0.044 246.7)
-
Step 950
950
#1B2834
oklch(27.1% 0.029 246.9)
#577FA5 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) | #7080A7 | 0.032 |
| Deuteranopia (no green cones) | #6678A4 | 0.025 |
| Tritanopia (no blue cones) | #35888C | 0.063 |
| Achromatopsia (no color) | #7B7B7B | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577FA5
#577FA5
oklch(58.2% 0.074 247.9)
- #98734A
#98734A
oklch(58.3% 0.073 68.4)
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 #577FA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.017
- Stormy Blue #507B9C ΔE 0.019
- Dusty Blue #5A86AD ΔE 0.022
- Steel Blue #4682B4 ΔE 0.026
- Cerulean #457B9D ΔE 0.027
- Cool Blue #4984B8 ΔE 0.030
- Dull Blue #49759C ΔE 0.036
- Grey Blue #647D8E ΔE 0.036
Use #577FA5 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.