#509FF0
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.9% 0.143 251.2), rgb(80, 159, 240).
Aa
Black text reads best on this color (7.55:1).
About this color
#509FF0 is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.143 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.029 away. Black text reads best on it, at 7.55:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.55:1 |
| White text | 2.77:1 |
Values
| HEX | #509FF0 |
| RGB | rgb(80, 159, 240) |
| HSL | hsl(210, 84%, 63%) |
| OKLCH | oklch(68.9% 0.143 251.2) |
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 #509FF0 | 2.77:1 | Fails | Lc -58.5 | Large or bold text, headings |
| Black text on #509FF0 | 7.55:1 | AAA | Lc 50.7 | Large or bold text, headings |
| #509FF0 text on white | 2.77:1 | Fails | Lc 53.3 | Large or bold text, headings |
| #509FF0 text on black | 7.55:1 | AAA | Lc -48.6 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEECFB
oklch(93.7% 0.025 250)
-
Step 200
200
#C2DCFA
oklch(88.5% 0.05 252.1)
-
Step 300
300
#96C5F9
oklch(80.9% 0.089 251.5)
-
Step 400
400 (this color)
#509FF0
oklch(68.9% 0.143 251.2)
-
Step 500
500
#058BF3
oklch(63.1% 0.184 251.3)
-
Step 600
600
#0075CE
oklch(55.7% 0.162 251.1)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900
#004279
oklch(37.6% 0.11 251.3)
-
Step 950
950
#02274A
oklch(27% 0.076 251.4)
#509FF0 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) | #7BA3F3 | 0.045 |
| Deuteranopia (no green cones) | #6594EE | 0.032 |
| Tritanopia (no blue cones) | #00B2BC | 0.111 |
| Achromatopsia (no color) | #9B9B9B | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509FF0
#509FF0
oklch(68.9% 0.143 251.2)
- #D18916
#D18916
oklch(68.8% 0.143 71)
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 #509FF0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.029
- Cornflower Blue #6495ED ΔE 0.029
- Dark Sky Blue #448EE4 ΔE 0.049
- Soft Blue #6488EA ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.060
- Periwinkle Blue #8F99FB ΔE 0.071
- Perrywinkle #8F8CE7 ΔE 0.078
- Faded Blue #658CBB ΔE 0.084
Use #509FF0 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.