#577B8C
Closest named color: Grey Blue (#647D8E). oklch(56.2% 0.048 228.9), rgb(87, 123, 140).
Aa
Black text reads best on this color (4.61:1).
About this color
#577B8C is a medium-dark, muted teal or cyan. In OKLCH its lightness is 56%, its chroma 0.048 and its hue 229°. 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 4.61:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.61:1 |
| White text | 4.54:1 |
Values
| HEX | #577B8C |
| RGB | rgb(87, 123, 140) |
| HSL | hsl(199, 23%, 45%) |
| OKLCH | oklch(56.2% 0.048 228.9) |
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 #577B8C | 4.54:1 | AA | Lc -77.0 | Fine for body text |
| Black text on #577B8C | 4.61:1 | AA | Lc 32.5 | Non-text elements, placeholder text |
| #577B8C text on white | 4.54:1 | AA | Lc 71.5 | Content text, not long reading |
| #577B8C text on black | 4.61:1 | AA | Lc -30.1 | 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
#8BA5B2
oklch(70.6% 0.035 229.5)
-
Step 500
500
#6E8F9F
oklch(63.1% 0.044 229.1)
-
Step 600
600 (this color)
#577B8C
oklch(56.2% 0.048 228.9)
-
Step 700
700
#456675
oklch(49.1% 0.045 228.1)
-
Step 800
800
#39535F
oklch(42.6% 0.037 228.3)
-
Step 900
900
#31454E
oklch(37.7% 0.029 227.5)
-
Step 950
950
#1D282E
oklch(26.9% 0.019 232.2)
#577B8C 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) | #72798D | 0.036 |
| Deuteranopia (no green cones) | #6B738C | 0.033 |
| Tritanopia (no blue cones) | #448080 | 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°).
- #577B8C
#577B8C
oklch(56.2% 0.048 228.9)
- #8D6D5C
#8D6D5C
oklch(56.2% 0.048 49.3)
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 #577B8C, 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 0.026
- Battleship Grey #6B7C85 ΔE 0.028
- Metallic Blue #4F738E ΔE 0.028
- Cerulean #457B9D ΔE 0.031
- Battleship Gray #6C757D ΔE 0.033
- Slate Gray #708090 ΔE 0.037
- Dull Blue #49759C ΔE 0.039
Use #577B8C 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.