#577CE9
Closest named color: Cornflower (#6A79F7). oklch(61.4% 0.169 267.2), rgb(87, 124, 233).
Aa
Black text reads best on this color (5.46:1).
About this color
#577CE9 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.169 and its hue 267°. 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 5.46:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.46:1 |
| White text | 3.84:1 |
Values
| HEX | #577CE9 |
| RGB | rgb(87, 124, 233) |
| HSL | hsl(225, 77%, 63%) |
| OKLCH | oklch(61.4% 0.169 267.2) |
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 #577CE9 | 3.84:1 | AA large text | Lc -71.1 | Content text, not long reading |
| Black text on #577CE9 | 5.46:1 | AA | Lc 38.5 | Non-text elements, placeholder text |
| #577CE9 text on white | 3.84:1 | AA large text | Lc 65.6 | Content text, not long reading |
| #577CE9 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
#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
#A9C0F7
oklch(81% 0.082 266.9)
-
Step 400
400
#7C9DF3
oklch(70.8% 0.132 267.1)
-
Step 500
500 (this color)
#577CE9
oklch(61.4% 0.169 267.2)
-
Step 600
600
#4468DD
oklch(55.6% 0.183 267.3)
-
Step 700
700
#3656C0
oklch(49.2% 0.17 267.1)
-
Step 800
800
#2D479B
oklch(42.8% 0.141 267.2)
-
Step 900
900
#273C7C
oklch(37.6% 0.112 267.2)
-
Step 950
950
#172448
oklch(27% 0.069 266.8)
#577CE9 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) | #4589ED | 0.034 |
| Deuteranopia (no green cones) | #2A7CE7 | 0.038 |
| Tritanopia (no blue cones) | #0095A7 | 0.144 |
| Achromatopsia (no color) | #828282 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577CE9
#577CE9
oklch(61.4% 0.169 267.2)
- #A47E00
#A47E00
oklch(61.3% 0.125 87.3)
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 #577CE9, 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 0.036
- Dark Sky Blue #448EE4 ΔE 0.050
- Clear Blue #247AFD ΔE 0.050
- Royal Blue #4169E1 ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.062
- Medium Slate Blue #7B68EE ΔE 0.063
- Chefchaouen Blue #4895EF ΔE 0.064
Use #577CE9 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.