#509BF0
Closest named color: Chefchaouen Blue (#4895EF). oklch(68% 0.147 253.2), rgb(80, 155, 240).
Aa
Black text reads best on this color (7.28:1).
About this color
#509BF0 is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.147 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.018 away. Black text reads best on it, at 7.28:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.28:1 |
| White text | 2.88:1 |
Values
| HEX | #509BF0 |
| RGB | rgb(80, 155, 240) |
| HSL | hsl(212, 84%, 63%) |
| OKLCH | oklch(68% 0.147 253.2) |
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 #509BF0 | 2.88:1 | Fails | Lc -60.1 | Content text, not long reading |
| Black text on #509BF0 | 7.28:1 | AAA | Lc 49.3 | Large or bold text, headings |
| #509BF0 text on white | 2.88:1 | Fails | Lc 54.8 | Large or bold text, headings |
| #509BF0 text on black | 7.28:1 | AAA | Lc -47.0 | Large or bold text, headings |
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 400.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFC
oklch(93.5% 0.027 255.1)
-
Step 200
200
#C2DCFB
oklch(88.5% 0.051 252.9)
-
Step 300
300
#97C4FB
oklch(80.8% 0.092 253.8)
-
Step 400
400 (this color)
#509BF0
oklch(68% 0.147 253.2)
-
Step 500
500
#1789F6
oklch(63% 0.188 253.3)
-
Step 600
600
#0073D4
oklch(55.6% 0.172 253.1)
-
Step 700
700
#0060B4
oklch(49.1% 0.153 253.4)
-
Step 800
800
#004F95
oklch(42.8% 0.133 253.1)
-
Step 900
900
#00417D
oklch(37.6% 0.117 253.3)
-
Step 950
950
#04274B
oklch(27.2% 0.077 253)
#509BF0 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) | #75A0F4 | 0.041 |
| Deuteranopia (no green cones) | #5E91EE | 0.027 |
| Tritanopia (no blue cones) | #00AFBA | 0.116 |
| Achromatopsia (no color) | #989898 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509BF0
#509BF0
oklch(68% 0.147 253.2)
- #CD8800
#CD8800
oklch(68% 0.145 73.4)
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 #509BF0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.018
- Cornflower Blue #6495ED ΔE 0.022
- Dark Sky Blue #448EE4 ΔE 0.040
- Soft Blue #6488EA ΔE 0.050
- Dodger Blue #1E90FF ΔE 0.052
- Periwinkle Blue #8F99FB ΔE 0.071
- Perrywinkle #8F8CE7 ΔE 0.075
- Lavender Blue #8B88F8 ΔE 0.079
Use #509BF0 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.