#509DDD
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.5% 0.122 246), rgb(80, 157, 221).
Aa
Black text reads best on this color (7.20:1).
About this color
#509DDD is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.122 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.039 away. Black text reads best on it, at 7.20:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.20:1 |
| White text | 2.91:1 |
Values
| HEX | #509DDD |
| RGB | rgb(80, 157, 221) |
| HSL | hsl(207, 67%, 59%) |
| OKLCH | oklch(67.5% 0.122 246) |
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 #509DDD | 2.91:1 | Fails | Lc -60.6 | Content text, not long reading |
| Black text on #509DDD | 7.20:1 | AAA | Lc 48.8 | Large or bold text, headings |
| #509DDD text on white | 2.91:1 | Fails | Lc 55.3 | Large or bold text, headings |
| #509DDD text on black | 7.20:1 | AAA | Lc -46.5 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF8
oklch(93.6% 0.022 243.8)
-
Step 200
200
#C3DDF4
oklch(88.6% 0.042 245)
-
Step 300
300
#98C6EF
oklch(80.8% 0.076 245.8)
-
Step 400
400 (this color)
#509DDD
oklch(67.5% 0.122 246)
-
Step 500
500
#178FE1
oklch(63% 0.156 246.2)
-
Step 600
600
#0078C1
oklch(55.5% 0.143 246.2)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#005287
oklch(42.6% 0.111 246.5)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#042844
oklch(26.9% 0.065 247)
#509DDD 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) | #819FE0 | 0.052 |
| Deuteranopia (no green cones) | #6E91DC | 0.040 |
| Tritanopia (no blue cones) | #00ACB3 | 0.093 |
| Achromatopsia (no color) | #979797 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509DDD
#509DDD
oklch(67.5% 0.122 246)
- #C9863A
#C9863A
oklch(67.5% 0.122 66.2)
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 #509DDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.039
- Cornflower Blue #6495ED ΔE 0.040
- Dark Sky Blue #448EE4 ΔE 0.047
- Faded Blue #658CBB ΔE 0.060
- Soft Blue #6488EA ΔE 0.065
- Greyblue #77A1B5 ΔE 0.073
- Dodger Blue #1E90FF ΔE 0.074
- Water Blue #0E87CC ΔE 0.079
Use #509DDD 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.