#577BE9
Closest named color: Cornflower (#6A79F7). oklch(61.2% 0.171 267.6), rgb(87, 123, 233).
Aa
Black text reads best on this color (5.41:1).
About this color
#577BE9 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.171 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.032 away. Black text reads best on it, at 5.41:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.41:1 |
| White text | 3.87:1 |
Values
| HEX | #577BE9 |
| RGB | rgb(87, 123, 233) |
| HSL | hsl(225, 77%, 63%) |
| OKLCH | oklch(61.2% 0.171 267.6) |
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 #577BE9 | 3.87:1 | AA large text | Lc -71.4 | Content text, not long reading |
| Black text on #577BE9 | 5.41:1 | AA | Lc 38.1 | Non-text elements, placeholder text |
| #577BE9 text on white | 3.87:1 | AA large text | Lc 65.9 | Content text, not long reading |
| #577BE9 text on black | 5.41:1 | AA | Lc -35.7 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#A9BFF7
oklch(80.8% 0.083 267.9)
-
Step 400
400
#7C9CF4
oklch(70.6% 0.134 267.8)
-
Step 500
500 (this color)
#577BE9
oklch(61.2% 0.171 267.6)
-
Step 600
600
#4467DE
oklch(55.5% 0.186 267.6)
-
Step 700
700
#3655C1
oklch(49.1% 0.173 267.5)
-
Step 800
800
#2D469C
oklch(42.6% 0.143 267.7)
-
Step 900
900
#283C7C
oklch(37.7% 0.111 267.7)
-
Step 950
950
#172449
oklch(27.1% 0.071 267.1)
#577BE9 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) | #4388ED | 0.035 |
| Deuteranopia (no green cones) | #267BE7 | 0.040 |
| Tritanopia (no blue cones) | #0094A7 | 0.144 |
| Achromatopsia (no color) | #818181 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577BE9
#577BE9
oklch(61.2% 0.171 267.6)
- #A37E00
#A37E00
oklch(61.2% 0.125 87.9)
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 #577BE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.032
- Soft Blue #6488EA ΔE 0.039
- Clear Blue #247AFD ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.052
- Royal Blue #4169E1 ΔE 0.055
- Medium Slate Blue #7B68EE ΔE 0.062
- Dodger Blue #1E90FF ΔE 0.063
- Chefchaouen Blue #4895EF ΔE 0.066
Use #577BE9 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.