#577C91
Closest named color: Grey Blue (#647D8E). oklch(56.7% 0.053 233.8), rgb(87, 124, 145).
Aa
Black text reads best on this color (4.69:1).
About this color
#577C91 is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.053 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.017 away. Black text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.69:1 |
| White text | 4.47:1 |
Values
| HEX | #577C91 |
| RGB | rgb(87, 124, 145) |
| HSL | hsl(202, 25%, 45%) |
| OKLCH | oklch(56.7% 0.053 233.8) |
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 #577C91 | 4.47:1 | AA large text | Lc -76.5 | Fine for body text |
| Black text on #577C91 | 4.69:1 | AA | Lc 33.1 | Non-text elements, placeholder text |
| #577C91 text on white | 4.47:1 | AA large text | Lc 71.0 | Content text, not long reading |
| #577C91 text on black | 4.69:1 | AA | Lc -30.7 | 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
#E6EBEE
oklch(93.7% 0.007 233.6)
-
Step 200
200
#D1DBE1
oklch(88.6% 0.014 233.8)
-
Step 300
300
#B2C4CE
oklch(81% 0.024 231.9)
-
Step 400
400
#8AA5B5
oklch(70.7% 0.038 234.1)
-
Step 500
500
#6D8FA3
oklch(63.2% 0.049 234.4)
-
Step 600
600 (this color)
#577C91
oklch(56.7% 0.053 233.8)
-
Step 700
700
#446679
oklch(49.2% 0.05 233.6)
-
Step 800
800
#385362
oklch(42.7% 0.041 233.3)
-
Step 900
900
#314550
oklch(37.8% 0.031 232.7)
-
Step 950
950
#1D282F
oklch(27% 0.02 236.4)
#577C91 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) | #727B92 | 0.035 |
| Deuteranopia (no green cones) | #6A7491 | 0.032 |
| Tritanopia (no blue cones) | #418283 | 0.040 |
| Achromatopsia (no color) | #777777 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577C91
#577C91
oklch(56.7% 0.053 233.8)
- #906E59
#906E59
oklch(56.6% 0.053 53)
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 #577C91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.017
- Stormy Blue #507B9C ΔE 0.020
- Cerulean #457B9D ΔE 0.027
- Metallic Blue #4F738E ΔE 0.029
- Battleship Grey #6B7C85 ΔE 0.030
- Dull Blue #49759C ΔE 0.035
- Slate Gray #708090 ΔE 0.035
- Battleship Gray #6C757D ΔE 0.038
Use #577C91 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.