#509DB1
Closest named color: Cadet Blue (#5F9EA0). oklch(65.5% 0.081 216.9), rgb(80, 157, 177).
Aa
Black text reads best on this color (6.79:1).
About this color
#509DB1 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.081 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.029 away. Black text reads best on it, at 6.79:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.79:1 |
| White text | 3.08:1 |
Values
| HEX | #509DB1 |
| RGB | rgb(80, 157, 177) |
| HSL | hsl(192, 38%, 50%) |
| OKLCH | oklch(65.5% 0.081 216.9) |
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 #509DB1 | 3.08:1 | AA large text | Lc -63.0 | Content text, not long reading |
| Black text on #509DB1 | 6.79:1 | AA | Lc 46.4 | Large or bold text, headings |
| #509DB1 text on white | 3.08:1 | AA large text | Lc 57.7 | Large or bold text, headings |
| #509DB1 text on black | 6.79:1 | AA | Lc -44.1 | 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
#A5C8D1
oklch(81% 0.039 215.1)
-
Step 400
400
#72ABBB
oklch(70.8% 0.064 217.3)
-
Step 500
500 (this color)
#509DB1
oklch(65.5% 0.081 216.9)
-
Step 600
600
#248095
oklch(55.7% 0.088 216.7)
-
Step 700
700
#136C7F
oklch(49.2% 0.082 216.6)
-
Step 800
800
#155867
oklch(42.7% 0.068 216.5)
-
Step 900
900
#1A4854
oklch(37.6% 0.053 217.9)
-
Step 950
950
#112A31
oklch(26.8% 0.033 218.4)
#509DB1 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) | #9099B2 | 0.072 |
| Deuteranopia (no green cones) | #818EB1 | 0.065 |
| Tritanopia (no blue cones) | #00A4A3 | 0.048 |
| Achromatopsia (no color) | #939393 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509DB1
#509DB1
oklch(65.5% 0.081 216.9)
- #BC7F6D
#BC7F6D
oklch(65.4% 0.081 37.1)
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 #509DB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.029
- Greyblue #77A1B5 ΔE 0.043
- Sea #3C9992 ΔE 0.051
- Dull Teal #5F9E8F ΔE 0.053
- Blue Grey #758DA3 ΔE 0.053
- Silver Lake Blue #778DA9 ΔE 0.055
- Grey Teal #5E9B8A ΔE 0.057
- Faded Blue #658CBB ΔE 0.057
Use #509DB1 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.