#577D91
Closest named color: Grey Blue (#647D8E). oklch(56.9% 0.053 231.8), rgb(87, 125, 145).
Aa
Black text reads best on this color (4.74:1).
About this color
#577D91 is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.053 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.016 away. Black text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.74:1 |
| White text | 4.42:1 |
Values
| HEX | #577D91 |
| RGB | rgb(87, 125, 145) |
| HSL | hsl(201, 25%, 45%) |
| OKLCH | oklch(56.9% 0.053 231.8) |
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 #577D91 | 4.42:1 | AA large text | Lc -76.1 | Fine for body text |
| Black text on #577D91 | 4.74:1 | AA | Lc 33.5 | Non-text elements, placeholder text |
| #577D91 text on white | 4.42:1 | AA large text | Lc 70.6 | Content text, not long reading |
| #577D91 text on black | 4.74:1 | AA | Lc -31.0 | 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
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D1DBE0
oklch(88.5% 0.013 228.9)
-
Step 300
300
#B2C4CD
oklch(80.9% 0.023 229.2)
-
Step 400
400
#8AA5B4
oklch(70.6% 0.037 232.3)
-
Step 500
500
#6C8FA2
oklch(63.1% 0.048 232.2)
-
Step 600
600 (this color)
#577D91
oklch(56.9% 0.053 231.8)
-
Step 700
700
#446678
oklch(49.2% 0.049 232.2)
-
Step 800
800
#385362
oklch(42.7% 0.041 233.3)
-
Step 900
900
#304550
oklch(37.7% 0.032 231.5)
-
Step 950
950
#1D282F
oklch(27% 0.02 236.4)
#577D91 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) | #737C92 | 0.036 |
| Deuteranopia (no green cones) | #6B7591 | 0.033 |
| Tritanopia (no blue cones) | #418383 | 0.040 |
| Achromatopsia (no color) | #787878 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577D91
#577D91
oklch(56.9% 0.053 231.8)
- #916F5B
#916F5B
oklch(57% 0.053 51.8)
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 #577D91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.016
- Stormy Blue #507B9C ΔE 0.021
- Cerulean #457B9D ΔE 0.028
- Battleship Grey #6B7C85 ΔE 0.029
- Metallic Blue #4F738E ΔE 0.032
- Slate Gray #708090 ΔE 0.034
- Steel Grey #6F828A ΔE 0.037
- Dull Blue #49759C ΔE 0.038
Use #577D91 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.