#509BDD
Closest named color: Chefchaouen Blue (#4895EF). oklch(67% 0.124 247.4), rgb(80, 155, 221).
Aa
Black text reads best on this color (7.07:1).
About this color
#509BDD is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.124 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.035 away. Black text reads best on it, at 7.07:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.07:1 |
| White text | 2.96:1 |
Values
| HEX | #509BDD |
| RGB | rgb(80, 155, 221) |
| HSL | hsl(208, 67%, 59%) |
| OKLCH | oklch(67% 0.124 247.4) |
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 #509BDD | 2.96:1 | Fails | Lc -61.4 | Content text, not long reading |
| Black text on #509BDD | 7.07:1 | AAA | Lc 48.0 | Large or bold text, headings |
| #509BDD text on white | 2.96:1 | Fails | Lc 56.0 | Large or bold text, headings |
| #509BDD text on black | 7.07:1 | AAA | Lc -45.8 | 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
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C3DCF5
oklch(88.4% 0.044 248.3)
-
Step 300
300
#99C6F0
oklch(80.9% 0.076 247)
-
Step 400
400 (this color)
#509BDD
oklch(67% 0.124 247.4)
-
Step 500
500
#1C8FE3
oklch(63.2% 0.158 247.2)
-
Step 600
600
#0077C4
oklch(55.5% 0.148 247.6)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#005289
oklch(42.7% 0.113 247.3)
-
Step 900
900
#004473
oklch(37.7% 0.1 247.4)
-
Step 950
950
#052844
oklch(26.9% 0.065 247.5)
#509BDD 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) | #7E9DE0 | 0.049 |
| Deuteranopia (no green cones) | #6B90DC | 0.037 |
| Tritanopia (no blue cones) | #00ABB2 | 0.096 |
| Achromatopsia (no color) | #969696 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509BDD
#509BDD
oklch(67% 0.124 247.4)
- #C78535
#C78535
oklch(67% 0.124 67.6)
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 #509BDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.035
- Cornflower Blue #6495ED ΔE 0.037
- Dark Sky Blue #448EE4 ΔE 0.042
- Faded Blue #658CBB ΔE 0.058
- Soft Blue #6488EA ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.071
- Water Blue #0E87CC ΔE 0.074
- Greyblue #77A1B5 ΔE 0.076
Use #509BDD 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.