#577CEF
Closest named color: Cornflower (#6A79F7). oklch(61.8% 0.177 267.6), rgb(87, 124, 239).
Aa
Black text reads best on this color (5.53:1).
About this color
#577CEF is a medium-dark, vivid blue. In OKLCH its lightness is 62%, its chroma 0.177 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.026 away. Black text reads best on it, at 5.53:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | vivid (0.177) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.53:1 |
| White text | 3.79:1 |
Values
| HEX | #577CEF |
| RGB | rgb(87, 124, 239) |
| HSL | hsl(225, 83%, 64%) |
| OKLCH | oklch(61.8% 0.177 267.6) |
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 #577CEF | 3.79:1 | AA large text | Lc -70.7 | Content text, not long reading |
| Black text on #577CEF | 5.53:1 | AA | Lc 38.9 | Non-text elements, placeholder text |
| #577CEF text on white | 3.79:1 | AA large text | Lc 65.2 | Content text, not long reading |
| #577CEF text on black | 5.53:1 | AA | Lc -36.5 | 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
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CBD9FA
oklch(88.5% 0.048 267.2)
-
Step 300
300
#A8BFFA
oklch(80.9% 0.088 267.9)
-
Step 400
400
#7B9CF7
oklch(70.7% 0.139 267.7)
-
Step 500
500 (this color)
#577CEF
oklch(61.8% 0.177 267.6)
-
Step 600
600
#4366E2
oklch(55.6% 0.193 267.7)
-
Step 700
700
#3554C5
oklch(49.2% 0.18 267.6)
-
Step 800
800
#2C459F
oklch(42.6% 0.149 267.8)
-
Step 900
900
#273C7E
oklch(37.8% 0.115 267.4)
-
Step 950
950
#17234A
oklch(26.9% 0.074 268.3)
#577CEF 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) | #3F8AF3 | 0.038 |
| Deuteranopia (no green cones) | #1C7CED | 0.044 |
| Tritanopia (no blue cones) | #0097AA | 0.150 |
| Achromatopsia (no color) | #838383 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577CEF
#577CEF
oklch(61.8% 0.177 267.6)
- #A68000
#A68000
oklch(61.9% 0.127 87.6)
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 #577CEF, closest first.
No curated palette has a color within ΔE 0.04 of #577CEF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.026
- Soft Blue #6488EA ΔE 0.038
- Clear Blue #247AFD ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.053
- Dodger Blue #1E90FF ΔE 0.059
- Royal Blue #4169E1 ΔE 0.059
- Medium Slate Blue #7B68EE ΔE 0.062
- Chefchaouen Blue #4895EF ΔE 0.064
Use #577CEF 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.