#577CE4
Closest named color: Soft Blue (#6488EA). oklch(61.1% 0.163 266.8), rgb(87, 124, 228).
Aa
Black text reads best on this color (5.40:1).
About this color
#577CE4 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.163 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.037 away. Black text reads best on it, at 5.40:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 5.40:1 |
| White text | 3.88:1 |
Values
| HEX | #577CE4 |
| RGB | rgb(87, 124, 228) |
| HSL | hsl(224, 72%, 62%) |
| OKLCH | oklch(61.1% 0.163 266.8) |
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 #577CE4 | 3.88:1 | AA large text | Lc -71.5 | Content text, not long reading |
| Black text on #577CE4 | 5.40:1 | AA | Lc 38.1 | Non-text elements, placeholder text |
| #577CE4 text on white | 3.88:1 | AA large text | Lc 66.0 | Content text, not long reading |
| #577CE4 text on black | 5.40:1 | 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
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#A9C0F5
oklch(80.9% 0.079 266.4)
-
Step 400
400
#7D9DF0
oklch(70.7% 0.127 267.1)
-
Step 500
500 (this color)
#577CE4
oklch(61.1% 0.163 266.8)
-
Step 600
600
#4469D9
oklch(55.5% 0.177 266.8)
-
Step 700
700
#3657BC
oklch(49.1% 0.164 266.6)
-
Step 800
800
#2D4898
oklch(42.7% 0.135 266.6)
-
Step 900
900
#283D79
oklch(37.7% 0.105 266.8)
-
Step 950
950
#172447
oklch(26.9% 0.068 266.6)
#577CE4 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) | #4A88E8 | 0.031 |
| Deuteranopia (no green cones) | #327BE2 | 0.034 |
| Tritanopia (no blue cones) | #0094A5 | 0.139 |
| Achromatopsia (no color) | #818181 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577CE4
#577CE4
oklch(61.1% 0.163 266.8)
- #A47D00
#A47D00
oklch(61.1% 0.125 86.6)
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 #577CE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.037
- Cornflower #6A79F7 ΔE 0.038
- Dark Sky Blue #448EE4 ΔE 0.048
- Clear Blue #247AFD ΔE 0.055
- Royal Blue #4169E1 ΔE 0.057
- Chefchaouen Blue #4895EF ΔE 0.064
- Dodger Blue #1E90FF ΔE 0.065
- Medium Slate Blue #7B68EE ΔE 0.066
Use #577CE4 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.