#509BDB
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.9% 0.121 246.6), rgb(80, 155, 219).
Aa
Black text reads best on this color (7.05:1).
About this color
#509BDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.121 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.038 away. Black text reads best on it, at 7.05:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.05:1 |
| White text | 2.97:1 |
Values
| HEX | #509BDB |
| RGB | rgb(80, 155, 219) |
| HSL | hsl(208, 66%, 59%) |
| OKLCH | oklch(66.9% 0.121 246.6) |
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 #509BDB | 2.97:1 | Fails | Lc -61.5 | Content text, not long reading |
| Black text on #509BDB | 7.05:1 | AAA | Lc 47.9 | Large or bold text, headings |
| #509BDB text on white | 2.97:1 | Fails | Lc 56.1 | Large or bold text, headings |
| #509BDB text on black | 7.05:1 | AAA | Lc -45.6 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C3DDF4
oklch(88.6% 0.042 245)
-
Step 300
300
#99C6EF
oklch(80.9% 0.075 246.4)
-
Step 400
400 (this color)
#509BDB
oklch(66.9% 0.121 246.6)
-
Step 500
500
#1D8FE1
oklch(63.1% 0.155 246.7)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#004472
oklch(37.6% 0.099 246.8)
-
Step 950
950
#052844
oklch(26.9% 0.065 247.5)
#509BDB 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) | #7F9DDE | 0.050 |
| Deuteranopia (no green cones) | #6C8FDA | 0.039 |
| Tritanopia (no blue cones) | #00AAB1 | 0.093 |
| Achromatopsia (no color) | #959595 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509BDB
#509BDB
oklch(66.9% 0.121 246.6)
- #C68539
#C68539
oklch(66.9% 0.121 67)
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 #509BDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.038
- Cornflower Blue #6495ED ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.043
- Faded Blue #658CBB ΔE 0.056
- Soft Blue #6488EA ΔE 0.062
- Dodger Blue #1E90FF ΔE 0.073
- Greyblue #77A1B5 ΔE 0.073
- Water Blue #0E87CC ΔE 0.074
Use #509BDB 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.