#577FE7
Closest named color: Soft Blue (#6488EA). oklch(61.9% 0.163 266), rgb(87, 127, 231).
Aa
Black text reads best on this color (5.59:1).
About this color
#577FE7 is a medium-dark, vivid blue. In OKLCH its lightness is 62%, its chroma 0.163 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.029 away. Black text reads best on it, at 5.59:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 5.59:1 |
| White text | 3.75:1 |
Values
| HEX | #577FE7 |
| RGB | rgb(87, 127, 231) |
| HSL | hsl(223, 75%, 62%) |
| OKLCH | oklch(61.9% 0.163 266) |
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 #577FE7 | 3.75:1 | AA large text | Lc -70.3 | Content text, not long reading |
| Black text on #577FE7 | 5.59:1 | AA | Lc 39.3 | Non-text elements, placeholder text |
| #577FE7 text on white | 3.75:1 | AA large text | Lc 64.8 | Content text, not long reading |
| #577FE7 text on black | 5.59:1 | AA | Lc -36.9 | 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
#CBD9F7
oklch(88.4% 0.044 265.6)
-
Step 300
300
#A8C0F5
oklch(80.9% 0.08 265.7)
-
Step 400
400
#7B9EF0
oklch(70.8% 0.127 265.7)
-
Step 500
500 (this color)
#577FE7
oklch(61.9% 0.163 266)
-
Step 600
600
#426ADA
oklch(55.7% 0.177 266)
-
Step 700
700
#3457BD
oklch(49.1% 0.166 266.1)
-
Step 800
800
#2B4899
oklch(42.7% 0.137 265.9)
-
Step 900
900
#273D79
oklch(37.6% 0.106 266.3)
-
Step 950
950
#172447
oklch(26.9% 0.068 266.6)
#577FE7 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) | #4D8BEB | 0.031 |
| Deuteranopia (no green cones) | #357EE5 | 0.031 |
| Tritanopia (no blue cones) | #0097A8 | 0.138 |
| Achromatopsia (no color) | #848484 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577FE7
#577FE7
oklch(61.9% 0.163 266)
- #A87F00
#A87F00
oklch(61.9% 0.127 85.8)
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 #577FE7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.029
- Cornflower #6A79F7 ΔE 0.037
- Dark Sky Blue #448EE4 ΔE 0.042
- Clear Blue #247AFD ΔE 0.054
- Chefchaouen Blue #4895EF ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.058
- Cornflower Blue #6495ED ΔE 0.061
- Royal Blue #4169E1 ΔE 0.064
Use #577FE7 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.