#509DB4
Closest named color: Cadet Blue (#5F9EA0). oklch(65.6% 0.083 219.8), rgb(80, 157, 180).
Aa
Black text reads best on this color (6.82:1).
About this color
#509DB4 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.083 and its hue 220°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.033 away. Black text reads best on it, at 6.82:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.82:1 |
| White text | 3.07:1 |
Values
| HEX | #509DB4 |
| RGB | rgb(80, 157, 180) |
| HSL | hsl(194, 40%, 51%) |
| OKLCH | oklch(65.6% 0.083 219.8) |
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 #509DB4 | 3.07:1 | AA large text | Lc -62.9 | Content text, not long reading |
| Black text on #509DB4 | 6.82:1 | AA | Lc 46.5 | Large or bold text, headings |
| #509DB4 text on white | 3.07:1 | AA large text | Lc 57.5 | Large or bold text, headings |
| #509DB4 text on black | 6.82:1 | AA | Lc -44.2 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECEF
oklch(93.6% 0.011 217.5)
-
Step 200
200
#CADDE3
oklch(88.5% 0.022 218.6)
-
Step 300
300
#A4C7D3
oklch(80.8% 0.041 220.6)
-
Step 400
400
#71ABBD
oklch(70.8% 0.066 219.4)
-
Step 500
500 (this color)
#509DB4
oklch(65.6% 0.083 219.8)
-
Step 600
600
#237F98
oklch(55.5% 0.091 220.4)
-
Step 700
700
#136B81
oklch(49% 0.084 219.9)
-
Step 800
800
#155869
oklch(42.8% 0.069 219)
-
Step 900
900
#1A4855
oklch(37.6% 0.054 219.6)
-
Step 950
950
#112A32
oklch(26.9% 0.034 221.3)
#509DB4 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) | #8F99B5 | 0.071 |
| Deuteranopia (no green cones) | #808EB4 | 0.063 |
| Tritanopia (no blue cones) | #00A5A4 | 0.052 |
| Achromatopsia (no color) | #939393 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509DB4
#509DB4
oklch(65.6% 0.083 219.8)
- #BD806A
#BD806A
oklch(65.7% 0.083 40.6)
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 #509DB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.033
- Greyblue #77A1B5 ΔE 0.043
- Blue Grey #758DA3 ΔE 0.054
- Silver Lake Blue #778DA9 ΔE 0.055
- Faded Blue #658CBB ΔE 0.055
- Sea #3C9992 ΔE 0.055
- Dull Teal #5F9E8F ΔE 0.057
- Turquoise Blue #06B1C4 ΔE 0.057
Use #509DB4 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.