#577FA8
Closest named color: Off Blue (#5684AE). oklch(58.4% 0.078 249.9), rgb(87, 127, 168).
Aa
Black text reads best on this color (5.00:1).
About this color
#577FA8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.078 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.015 away. Black text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #577FA8 |
| RGB | rgb(87, 127, 168) |
| HSL | hsl(210, 32%, 50%) |
| OKLCH | oklch(58.4% 0.078 249.9) |
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 #577FA8 | 4.19:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #577FA8 | 5.00:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #577FA8 text on white | 4.19:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #577FA8 text on black | 5.00:1 | AA | Lc -32.8 | 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
#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
#688DB3
oklch(63.1% 0.071 249.7)
-
Step 600
600 (this color)
#577FA8
oklch(58.4% 0.078 249.9)
-
Step 700
700
#406488
oklch(49.2% 0.071 249.5)
-
Step 800
800
#35516F
oklch(42.6% 0.061 251)
-
Step 900
900
#2E445A
oklch(37.8% 0.047 249.2)
-
Step 950
950
#1B2834
oklch(27.1% 0.029 246.9)
#577FA8 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) | #6F80AA | 0.031 |
| Deuteranopia (no green cones) | #6478A7 | 0.023 |
| Tritanopia (no blue cones) | #33888D | 0.066 |
| Achromatopsia (no color) | #7C7C7C | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577FA8
#577FA8
oklch(58.4% 0.078 249.9)
- #997346
#997346
oklch(58.3% 0.078 70)
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 #577FA8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.015
- Dusty Blue #5A86AD ΔE 0.021
- Stormy Blue #507B9C ΔE 0.022
- Steel Blue #4682B4 ΔE 0.023
- Cool Blue #4984B8 ΔE 0.027
- Cerulean #457B9D ΔE 0.029
- Dull Blue #49759C ΔE 0.037
- Grey Blue #647D8E ΔE 0.041
Use #577FA8 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.