#509FB8
Closest named color: Cadet Blue (#5F9EA0). oklch(66.2% 0.086 221.1), rgb(80, 159, 184).
Aa
Black text reads best on this color (6.99:1).
About this color
#509FB8 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.086 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.036 away. Black text reads best on it, at 6.99:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.99:1 |
| White text | 3.00:1 |
Values
| HEX | #509FB8 |
| RGB | rgb(80, 159, 184) |
| HSL | hsl(194, 42%, 52%) |
| OKLCH | oklch(66.2% 0.086 221.1) |
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 #509FB8 | 3.00:1 | AA large text | Lc -61.9 | Content text, not long reading |
| Black text on #509FB8 | 6.99:1 | AA | Lc 47.5 | Large or bold text, headings |
| #509FB8 text on white | 3.00:1 | AA large text | Lc 56.5 | Large or bold text, headings |
| #509FB8 text on black | 6.99:1 | AA | Lc -45.2 | 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 500.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#C9DDE4
oklch(88.5% 0.023 220.8)
-
Step 300
300
#A4C7D4
oklch(80.8% 0.042 222.4)
-
Step 400
400
#70ABBE
oklch(70.8% 0.067 220.2)
-
Step 500
500 (this color)
#509FB8
oklch(66.2% 0.086 221.1)
-
Step 600
600
#1F7F9A
oklch(55.5% 0.093 221.7)
-
Step 700
700
#0E6B83
oklch(49% 0.086 221.4)
-
Step 800
800
#12586B
oklch(42.8% 0.072 221)
-
Step 900
900
#194856
oklch(37.6% 0.055 220.9)
-
Step 950
950
#102A33
oklch(26.9% 0.036 223.3)
#509FB8 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) | #909BB9 | 0.071 |
| Deuteranopia (no green cones) | #8190B8 | 0.064 |
| Tritanopia (no blue cones) | #00A7A7 | 0.052 |
| Achromatopsia (no color) | #959595 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509FB8
#509FB8
oklch(66.2% 0.086 221.1)
- #C0816A
#C0816A
oklch(66.2% 0.085 40.8)
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 #509FB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.036
- Greyblue #77A1B5 ΔE 0.040
- Turquoise Blue #06B1C4 ΔE 0.052
- Faded Blue #658CBB ΔE 0.057
- Blue Grey #758DA3 ΔE 0.058
- Silver Lake Blue #778DA9 ΔE 0.058
- Bluegrey #85A3B2 ΔE 0.059
- Dull Teal #5F9E8F ΔE 0.061
Use #509FB8 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.