#577DBD
Closest named color: Cool Blue (#4984B8). oklch(59% 0.108 260.4), rgb(87, 125, 189).
Aa
Black text reads best on this color (5.07:1).
About this color
#577DBD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.108 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.026 away. Black text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.07:1 |
| White text | 4.13:1 |
Values
| HEX | #577DBD |
| RGB | rgb(87, 125, 189) |
| HSL | hsl(218, 44%, 54%) |
| OKLCH | oklch(59% 0.108 260.4) |
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 #577DBD | 4.13:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #577DBD | 5.07:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #577DBD text on white | 4.13:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #577DBD text on black | 5.07:1 | AA | Lc -33.3 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AFC2E1
oklch(81% 0.049 260.2)
-
Step 400
400
#85A2D1
oklch(70.8% 0.076 259.9)
-
Step 500
500
#668AC5
oklch(63.1% 0.098 260)
-
Step 600
600 (this color)
#577DBD
oklch(59% 0.108 260.4)
-
Step 700
700
#3E6099
oklch(49.1% 0.1 260.2)
-
Step 800
800
#344F7C
oklch(42.8% 0.082 260.2)
-
Step 900
900
#2D4264
oklch(37.8% 0.064 259.7)
-
Step 950
950
#1B273A
oklch(27.1% 0.039 259.4)
#577DBD 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) | #6482C0 | 0.022 |
| Deuteranopia (no green cones) | #5778BC | 0.014 |
| Tritanopia (no blue cones) | #1E8B94 | 0.096 |
| Achromatopsia (no color) | #7D7D7D | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577DBD
#577DBD
oklch(59% 0.108 260.4)
- #9E7524
#9E7524
oklch(58.9% 0.108 80.3)
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 #577DBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.026
- Steel Blue #4682B4 ΔE 0.028
- Off Blue #5684AE ΔE 0.035
- Windows Blue #3778BF ΔE 0.036
- Dusty Blue #5A86AD ΔE 0.041
- Faded Blue #658CBB ΔE 0.048
- Water Blue #0E87CC ΔE 0.051
- Flat Blue #3C73A8 ΔE 0.052
Use #577DBD 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.