#577791
Closest named color: Metallic Blue (#4F738E). oklch(55.5% 0.055 243.5), rgb(87, 119, 145).
Aa
White text reads best on this color (4.71:1).
About this color
#577791 is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.055 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.016 away. White text reads best on it, at 4.71:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.45:1 |
| White text | 4.71:1 |
Values
| HEX | #577791 |
| RGB | rgb(87, 119, 145) |
| HSL | hsl(207, 25%, 45%) |
| OKLCH | oklch(55.5% 0.055 243.5) |
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 #577791 | 4.71:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #577791 | 4.45:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #577791 text on white | 4.71:1 | AA | Lc 72.7 | Content text, not long reading |
| #577791 text on black | 4.45:1 | AA large text | Lc -29.0 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EAEE
oklch(93.5% 0.007 247.9)
-
Step 200
200
#D2DAE2
oklch(88.5% 0.014 248)
-
Step 300
300
#B4C3D0
oklch(81% 0.025 244.2)
-
Step 400
400
#8CA4B8
oklch(70.7% 0.04 243.5)
-
Step 500
500
#6F8DA6
oklch(63% 0.051 243.8)
-
Step 600
600 (this color)
#577791
oklch(55.5% 0.055 243.5)
-
Step 700
700
#47647C
oklch(49% 0.052 244.1)
-
Step 800
800
#3B5265
oklch(42.8% 0.042 243.9)
-
Step 900
900
#334452
oklch(37.8% 0.032 243.6)
-
Step 950
950
#1E2830
oklch(27.1% 0.02 242.7)
#577791 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) | #6C7792 | 0.028 |
| Deuteranopia (no green cones) | #657191 | 0.024 |
| Tritanopia (no blue cones) | #427D7F | 0.045 |
| Achromatopsia (no color) | #737373 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577791
#577791
oklch(55.5% 0.055 243.5)
- #8A6C51
#8A6C51
oklch(55.4% 0.055 63.3)
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 #577791, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.016
- Stormy Blue #507B9C ΔE 0.018
- Cerulean #457B9D ΔE 0.025
- Dull Blue #49759C ΔE 0.025
- Grey Blue #647D8E ΔE 0.027
- Battleship Grey #6B7C85 ΔE 0.038
- Battleship Gray #6C757D ΔE 0.038
- Muted Blue #3B719F ΔE 0.044
Use #577791 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.