#577399
Closest named color: Dull Blue (#49759C). oklch(54.9% 0.068 256.2), rgb(87, 115, 153).
Aa
White text reads best on this color (4.86:1).
About this color
#577399 is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.068 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.016 away. White text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.31:1 |
| White text | 4.86:1 |
Values
| HEX | #577399 |
| RGB | rgb(87, 115, 153) |
| HSL | hsl(215, 27%, 47%) |
| OKLCH | oklch(54.9% 0.068 256.2) |
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 #577399 | 4.86:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #577399 | 4.31:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #577399 text on white | 4.86:1 | AA | Lc 73.7 | Content text, not long reading |
| #577399 text on black | 4.31:1 | AA large text | Lc -28.0 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D2DAE5
oklch(88.6% 0.017 256.3)
-
Step 300
300
#B4C2D5
oklch(80.9% 0.031 256)
-
Step 400
400
#8DA2BF
oklch(70.6% 0.049 256.5)
-
Step 500
500
#718BAF
oklch(63% 0.062 256.6)
-
Step 600
600 (this color)
#577399
oklch(54.9% 0.068 256.2)
-
Step 700
700
#496285
oklch(49.1% 0.064 256.9)
-
Step 800
800
#3C506C
oklch(42.7% 0.053 256.9)
-
Step 900
900
#334357
oklch(37.8% 0.04 254.3)
-
Step 950
950
#1E2733
oklch(27% 0.026 255.7)
#577399 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) | #65759B | 0.020 |
| Deuteranopia (no green cones) | #5D6E98 | 0.015 |
| Tritanopia (no blue cones) | #3F7B80 | 0.059 |
| Achromatopsia (no color) | #717171 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577399
#577399
oklch(54.9% 0.068 256.2)
- #886C42
#886C42
oklch(54.9% 0.068 76.7)
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 #577399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.016
- Metallic Blue #4F738E ΔE 0.021
- Stormy Blue #507B9C ΔE 0.023
- Cerulean #457B9D ΔE 0.027
- Muted Blue #3B719F ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.036
- Grey Blue #647D8E ΔE 0.043
- French Blue #436BAD ΔE 0.050
Use #577399 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.