#509EB2
Closest named color: Cadet Blue (#5F9EA0). oklch(65.8% 0.082 216.7), rgb(80, 158, 178).
Aa
Black text reads best on this color (6.87:1).
About this color
#509EB2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.082 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 6.87:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.87:1 |
| White text | 3.05:1 |
Values
| HEX | #509EB2 |
| RGB | rgb(80, 158, 178) |
| HSL | hsl(192, 39%, 51%) |
| OKLCH | oklch(65.8% 0.082 216.7) |
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 #509EB2 | 3.05:1 | AA large text | Lc -62.6 | Content text, not long reading |
| Black text on #509EB2 | 6.87:1 | AA | Lc 46.8 | Large or bold text, headings |
| #509EB2 text on white | 3.05:1 | AA large text | Lc 57.2 | Large or bold text, headings |
| #509EB2 text on black | 6.87:1 | AA | Lc -44.5 | 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
#A4C8D2
oklch(81% 0.041 216.5)
-
Step 400
400
#71ABBB
oklch(70.7% 0.065 217)
-
Step 500
500 (this color)
#509EB2
oklch(65.8% 0.082 216.7)
-
Step 600
600
#228095
oklch(55.6% 0.089 216.5)
-
Step 700
700
#116C7F
oklch(49.1% 0.083 216.5)
-
Step 800
800
#145867
oklch(42.7% 0.069 216.3)
-
Step 900
900
#1A4954
oklch(37.8% 0.053 215.9)
-
Step 950
950
#112B31
oklch(27.1% 0.034 214.8)
#509EB2 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) | #909AB3 | 0.072 |
| Deuteranopia (no green cones) | #828FB2 | 0.065 |
| Tritanopia (no blue cones) | #00A5A4 | 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°).
- #509EB2
#509EB2
oklch(65.8% 0.082 216.7)
- #BE806E
#BE806E
oklch(65.9% 0.082 36.9)
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 #509EB2, 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 0.042
- Sea #3C9992 ΔE 0.053
- Dull Teal #5F9E8F ΔE 0.053
- Blue Grey #758DA3 ΔE 0.055
- Turquoise Blue #06B1C4 ΔE 0.055
- Silver Lake Blue #778DA9 ΔE 0.057
- Grey Teal #5E9B8A ΔE 0.058
Use #509EB2 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.