#577B81
Closest named color: Grey Blue (#647D8E). oklch(55.8% 0.042 208.9), rgb(87, 123, 129).
Aa
White text reads best on this color (4.60:1).
About this color
#577B81 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 56%, its chroma 0.042 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.027 away. White text reads best on it, at 4.60:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.55:1 |
| White text | 4.60:1 |
Values
| HEX | #577B81 |
| RGB | rgb(87, 123, 129) |
| HSL | hsl(189, 19%, 42%) |
| OKLCH | oklch(55.8% 0.042 208.9) |
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 #577B81 | 4.60:1 | AA | Lc -77.4 | Fine for body text |
| Black text on #577B81 | 4.55:1 | AA | Lc 32.1 | Non-text elements, placeholder text |
| #577B81 text on white | 4.60:1 | AA | Lc 72.0 | Content text, not long reading |
| #577B81 text on black | 4.55:1 | AA | Lc -29.7 | Dividers and decoration only |
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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E6EBEC
oklch(93.7% 0.006 211)
-
Step 200
200
#D2DBDD
oklch(88.5% 0.01 212.5)
-
Step 300
300
#B4C4C7
oklch(80.9% 0.018 210.2)
-
Step 400
400
#8CA6AB
oklch(70.7% 0.03 210.6)
-
Step 500
500
#6F9096
oklch(63.1% 0.038 209.9)
-
Step 600
600 (this color)
#577B81
oklch(55.8% 0.042 208.9)
-
Step 700
700
#46676C
oklch(49% 0.039 207.8)
-
Step 800
800
#3A5458
oklch(42.7% 0.032 207.9)
-
Step 900
900
#324549
oklch(37.6% 0.025 212)
-
Step 950
950
#1E292B
oklch(27.1% 0.016 209.9)
#577B81 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) | #757881 | 0.040 |
| Deuteranopia (no green cones) | #6E7381 | 0.037 |
| Tritanopia (no blue cones) | #487E7D | 0.021 |
| Achromatopsia (no color) | #757575 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577B81
#577B81
oklch(55.8% 0.042 208.9)
- #8B6B66
#8B6B66
oklch(55.8% 0.042 28.7)
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 #577B81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.027
- Battleship Grey #6B7C85 ΔE 0.027
- Battleship Gray #6C757D ΔE 0.030
- Metallic Blue #4F738E ΔE 0.038
- Steel Grey #6F828A ΔE 0.041
- Stormy Blue #507B9C ΔE 0.043
- Slate Gray #708090 ΔE 0.043
- Cerulean #457B9D ΔE 0.046
Use #577B81 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.