#509FEF
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.8% 0.142 250.9), rgb(80, 159, 239).
Aa
Black text reads best on this color (7.54:1).
About this color
#509FEF is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.142 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 7.54:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.54:1 |
| White text | 2.78:1 |
Values
| HEX | #509FEF |
| RGB | rgb(80, 159, 239) |
| HSL | hsl(210, 83%, 63%) |
| OKLCH | oklch(68.8% 0.142 250.9) |
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 #509FEF | 2.78:1 | Fails | Lc -58.6 | Large or bold text, headings |
| Black text on #509FEF | 7.54:1 | AAA | Lc 50.7 | Large or bold text, headings |
| #509FEF text on white | 2.78:1 | Fails | Lc 53.4 | Large or bold text, headings |
| #509FEF text on black | 7.54:1 | AAA | Lc -48.5 | 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
#C2DCF9
oklch(88.5% 0.049 251.2)
-
Step 300
300
#96C5F8
oklch(80.9% 0.088 251)
-
Step 400
400 (this color)
#509FEF
oklch(68.8% 0.142 250.9)
-
Step 500
500
#068BF2
oklch(63% 0.182 251.1)
-
Step 600
600
#0075CD
oklch(55.6% 0.161 250.9)
-
Step 700
700
#0062AD
oklch(49.1% 0.142 250.8)
-
Step 800
800
#00508F
oklch(42.6% 0.123 250.8)
-
Step 900
900
#004379
oklch(37.8% 0.109 250.7)
-
Step 950
950
#022749
oklch(26.9% 0.075 250.8)
#509FEF 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) | #7CA3F2 | 0.047 |
| Deuteranopia (no green cones) | #6594ED | 0.032 |
| Tritanopia (no blue cones) | #00B2BC | 0.110 |
| Achromatopsia (no color) | #9B9B9B | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509FEF
#509FEF
oklch(68.8% 0.142 250.9)
- #D1891A
#D1891A
oklch(68.8% 0.142 70.6)
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 #509FEF, 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 0.061
- Periwinkle Blue #8F99FB ΔE 0.072
- Perrywinkle #8F8CE7 ΔE 0.079
- Faded Blue #658CBB ΔE 0.082
Use #509FEF 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.