#577BED
Closest named color: Cornflower (#6A79F7). oklch(61.5% 0.176 267.8), rgb(87, 123, 237).
Aa
Black text reads best on this color (5.46:1).
About this color
#577BED is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.176 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.028 away. Black text reads best on it, at 5.46:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.176) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.46:1 |
| White text | 3.84:1 |
Values
| HEX | #577BED |
| RGB | rgb(87, 123, 237) |
| HSL | hsl(226, 81%, 64%) |
| OKLCH | oklch(61.5% 0.176 267.8) |
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 #577BED | 3.84:1 | AA large text | Lc -71.1 | Content text, not long reading |
| Black text on #577BED | 5.46:1 | AA | Lc 38.5 | Non-text elements, placeholder text |
| #577BED text on white | 3.84:1 | AA large text | Lc 65.6 | Content text, not long reading |
| #577BED text on black | 5.46:1 | AA | Lc -36.0 | 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 500.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CBD9FA
oklch(88.5% 0.048 267.2)
-
Step 300
300
#A8BFF9
oklch(80.8% 0.086 267.7)
-
Step 400
400
#7B9CF6
oklch(70.7% 0.137 267.6)
-
Step 500
500 (this color)
#577BED
oklch(61.5% 0.176 267.8)
-
Step 600
600
#4466E1
oklch(55.5% 0.191 267.9)
-
Step 700
700
#3654C4
oklch(49.1% 0.178 267.8)
-
Step 800
800
#2D469E
oklch(42.8% 0.146 267.8)
-
Step 900
900
#273C7E
oklch(37.8% 0.115 267.4)
-
Step 950
950
#17234A
oklch(26.9% 0.074 268.3)
#577BED 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) | #3F89F1 | 0.038 |
| Deuteranopia (no green cones) | #1D7CEB | 0.043 |
| Tritanopia (no blue cones) | #0095A9 | 0.147 |
| Achromatopsia (no color) | #828282 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577BED
#577BED
oklch(61.5% 0.176 267.8)
- #A47F00
#A47F00
oklch(61.5% 0.126 88.1)
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 #577BED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.028
- Soft Blue #6488EA ΔE 0.039
- Clear Blue #247AFD ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.054
- Royal Blue #4169E1 ΔE 0.056
- Medium Slate Blue #7B68EE ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.061
- Chefchaouen Blue #4895EF ΔE 0.066
Use #577BED 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.