#577CF9
Closest named color: Cornflower (#6A79F7). oklch(62.5% 0.191 268.1), rgb(87, 124, 249).
Aa
Black text reads best on this color (5.65:1).
About this color
#577CF9 is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.191 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.022 away. Black text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.191) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.65:1 |
| White text | 3.71:1 |
Values
| HEX | #577CF9 |
| RGB | rgb(87, 124, 249) |
| HSL | hsl(226, 93%, 66%) |
| OKLCH | oklch(62.5% 0.191 268.1) |
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 #577CF9 | 3.71:1 | AA large text | Lc -69.8 | Content text, not long reading |
| Black text on #577CF9 | 5.65:1 | AA | Lc 39.7 | Non-text elements, placeholder text |
| #577CF9 text on white | 3.71:1 | AA large text | Lc 64.3 | Content text, not long reading |
| #577CF9 text on black | 5.65:1 | AA | Lc -37.3 | 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
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CAD9FC
oklch(88.5% 0.051 267)
-
Step 300
300
#A7BFFE
oklch(81% 0.093 268.2)
-
Step 400
400
#799BFD
oklch(70.7% 0.149 268)
-
Step 500
500 (this color)
#577CF9
oklch(62.5% 0.191 268.1)
-
Step 600
600
#4163EA
oklch(55.5% 0.207 268.1)
-
Step 700
700
#3451CC
oklch(49.1% 0.193 268.1)
-
Step 800
800
#2B43A5
oklch(42.7% 0.16 268.2)
-
Step 900
900
#263A83
oklch(37.7% 0.125 268.3)
-
Step 950
950
#16234C
oklch(27% 0.078 267.7)
#577CF9 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) | #338CFD | 0.044 |
| Deuteranopia (no green cones) | #007EF6 | 0.049 |
| Tritanopia (no blue cones) | #0099AF | 0.157 |
| Achromatopsia (no color) | #858585 | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577CF9
#577CF9
oklch(62.5% 0.191 268.1)
- #A78200
#A78200
oklch(62.5% 0.128 88.5)
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 #577CF9, closest first.
No curated palette has a color within ΔE 0.04 of #577CF9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.022
- Clear Blue #247AFD ΔE 0.041
- Soft Blue #6488EA ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.056
- Dark Sky Blue #448EE4 ΔE 0.061
- Medium Slate Blue #7B68EE ΔE 0.062
- Royal Blue #4169E1 ΔE 0.065
- Chefchaouen Blue #4895EF ΔE 0.068
Use #577CF9 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.