#577B8D
Closest named color: Grey Blue (#647D8E). oklch(56.3% 0.049 230.4), rgb(87, 123, 141).
Aa
Black text reads best on this color (4.62:1).
About this color
#577B8D is a medium-dark, muted blue. In OKLCH its lightness is 56%, its chroma 0.049 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.018 away. Black text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.62:1 |
| White text | 4.54:1 |
Values
| HEX | #577B8D |
| RGB | rgb(87, 123, 141) |
| HSL | hsl(200, 24%, 45%) |
| OKLCH | oklch(56.3% 0.049 230.4) |
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 #577B8D | 4.54:1 | AA | Lc -77.0 | Fine for body text |
| Black text on #577B8D | 4.62:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #577B8D text on white | 4.54:1 | AA | Lc 71.5 | Content text, not long reading |
| #577B8D text on black | 4.62:1 | AA | Lc -30.2 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E6EBED
oklch(93.7% 0.006 223.5)
-
Step 200
200
#D1DBE0
oklch(88.5% 0.013 228.9)
-
Step 300
300
#B3C4CC
oklch(81% 0.022 227.6)
-
Step 400
400
#8BA5B3
oklch(70.7% 0.035 231.5)
-
Step 500
500
#6E8FA0
oklch(63.1% 0.045 230.7)
-
Step 600
600 (this color)
#577B8D
oklch(56.3% 0.049 230.4)
-
Step 700
700
#456676
oklch(49.1% 0.046 229.8)
-
Step 800
800
#395360
oklch(42.7% 0.038 230.4)
-
Step 900
900
#31454E
oklch(37.7% 0.029 227.5)
-
Step 950
950
#1D282E
oklch(26.9% 0.019 232.2)
#577B8D 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) | #727A8E | 0.035 |
| Deuteranopia (no green cones) | #6A738D | 0.032 |
| Tritanopia (no blue cones) | #438081 | 0.035 |
| Achromatopsia (no color) | #767676 | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577B8D
#577B8D
oklch(56.3% 0.049 230.4)
- #8E6D5B
#8E6D5B
oklch(56.3% 0.05 49.9)
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 #577B8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.018
- Stormy Blue #507B9C ΔE 0.024
- Metallic Blue #4F738E ΔE 0.027
- Battleship Grey #6B7C85 ΔE 0.028
- Cerulean #457B9D ΔE 0.030
- Battleship Gray #6C757D ΔE 0.034
- Slate Gray #708090 ΔE 0.037
- Dull Blue #49759C ΔE 0.037
Use #577B8D 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.