#577FA9
Closest named color: Off Blue (#5684AE). oklch(58.4% 0.079 250.5), rgb(87, 127, 169).
Aa
Black text reads best on this color (5.01:1).
About this color
#577FA9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.079 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.014 away. Black text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.01:1 |
| White text | 4.18:1 |
Values
| HEX | #577FA9 |
| RGB | rgb(87, 127, 169) |
| HSL | hsl(211, 32%, 50%) |
| OKLCH | oklch(58.4% 0.079 250.5) |
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 #577FA9 | 4.18:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #577FA9 | 5.01:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #577FA9 text on white | 4.18:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #577FA9 text on black | 5.01:1 | AA | Lc -32.9 | 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
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE6
oklch(88.4% 0.02 252.9)
-
Step 300
300
#B0C3D7
oklch(80.9% 0.035 249.6)
-
Step 400
400
#86A4C3
oklch(70.7% 0.056 249.5)
-
Step 500
500
#688DB4
oklch(63.1% 0.072 250.3)
-
Step 600
600 (this color)
#577FA9
oklch(58.4% 0.079 250.5)
-
Step 700
700
#406489
oklch(49.2% 0.073 250.1)
-
Step 800
800
#35516F
oklch(42.6% 0.061 251)
-
Step 900
900
#2E435A
oklch(37.6% 0.048 251.4)
-
Step 950
950
#1B2835
oklch(27.1% 0.03 249)
#577FA9 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) | #6E80AB | 0.029 |
| Deuteranopia (no green cones) | #6478A8 | 0.023 |
| Tritanopia (no blue cones) | #32898D | 0.069 |
| Achromatopsia (no color) | #7C7C7C | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577FA9
#577FA9
oklch(58.4% 0.079 250.5)
- #997345
#997345
oklch(58.3% 0.079 70.5)
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 #577FA9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.014
- Dusty Blue #5A86AD ΔE 0.021
- Steel Blue #4682B4 ΔE 0.022
- Stormy Blue #507B9C ΔE 0.024
- Cool Blue #4984B8 ΔE 0.026
- Cerulean #457B9D ΔE 0.030
- Dull Blue #49759C ΔE 0.038
- Grey Blue #647D8E ΔE 0.042
Use #577FA9 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.