#509DDB
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.4% 0.12 245.2), rgb(80, 157, 219).
Aa
Black text reads best on this color (7.18:1).
About this color
#509DDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.120 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.042 away. Black text reads best on it, at 7.18:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.18:1 |
| White text | 2.92:1 |
Values
| HEX | #509DDB |
| RGB | rgb(80, 157, 219) |
| HSL | hsl(207, 66%, 59%) |
| OKLCH | oklch(67.4% 0.12 245.2) |
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 #509DDB | 2.92:1 | Fails | Lc -60.7 | Content text, not long reading |
| Black text on #509DDB | 7.18:1 | AAA | Lc 48.7 | Large or bold text, headings |
| #509DDB text on white | 2.92:1 | Fails | Lc 55.4 | Large or bold text, headings |
| #509DDB text on black | 7.18:1 | AAA | Lc -46.4 | 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
#C3DDF3
oklch(88.5% 0.041 243.7)
-
Step 300
300
#98C6EE
oklch(80.8% 0.075 245.2)
-
Step 400
400 (this color)
#509DDB
oklch(67.4% 0.12 245.2)
-
Step 500
500
#1790DF
oklch(63.1% 0.153 245.2)
-
Step 600
600
#0079BF
oklch(55.7% 0.14 245)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004570
oklch(37.7% 0.095 244.9)
-
Step 950
950
#042943
oklch(27.1% 0.063 244.6)
#509DDB 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) | #829FDE | 0.053 |
| Deuteranopia (no green cones) | #6F91DA | 0.041 |
| Tritanopia (no blue cones) | #00ACB3 | 0.091 |
| Achromatopsia (no color) | #979797 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509DDB
#509DDB
oklch(67.4% 0.12 245.2)
- #C8863D
#C8863D
oklch(67.4% 0.12 65.8)
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 #509DDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.042
- Cornflower Blue #6495ED ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.049
- Faded Blue #658CBB ΔE 0.058
- Soft Blue #6488EA ΔE 0.066
- Greyblue #77A1B5 ΔE 0.070
- Dodger Blue #1E90FF ΔE 0.077
- Water Blue #0E87CC ΔE 0.078
Use #509DDB 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.