#509CA9
Closest named color: Cadet Blue (#5F9EA0). oklch(64.9% 0.077 210), rgb(80, 156, 169).
Aa
Black text reads best on this color (6.66:1).
About this color
#509CA9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.077 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.021 away. Black text reads best on it, at 6.66:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.66:1 |
| White text | 3.14:1 |
Values
| HEX | #509CA9 |
| RGB | rgb(80, 156, 169) |
| HSL | hsl(189, 36%, 49%) |
| OKLCH | oklch(64.9% 0.077 210) |
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 #509CA9 | 3.14:1 | AA large text | Lc -63.8 | Content text, not long reading |
| Black text on #509CA9 | 6.66:1 | AA | Lc 45.6 | Large or bold text, headings |
| #509CA9 text on white | 3.14:1 | AA large text | Lc 58.4 | Large or bold text, headings |
| #509CA9 text on black | 6.66:1 | AA | Lc -43.3 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#CADDE1
oklch(88.5% 0.021 211.8)
-
Step 300
300
#A5C8CE
oklch(80.9% 0.038 209.1)
-
Step 400
400
#73ABB5
oklch(70.6% 0.06 209.9)
-
Step 500
500 (this color)
#509CA9
oklch(64.9% 0.077 210)
-
Step 600
600
#27818E
oklch(55.7% 0.084 209)
-
Step 700
700
#176D79
oklch(49.2% 0.078 209.2)
-
Step 800
800
#175863
oklch(42.6% 0.065 211.3)
-
Step 900
900
#1C4950
oklch(37.7% 0.05 209.1)
-
Step 950
950
#122B2F
oklch(27.1% 0.032 209)
#509CA9 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) | #9097AA | 0.073 |
| Deuteranopia (no green cones) | #838DA9 | 0.067 |
| Tritanopia (no blue cones) | #0EA2A0 | 0.041 |
| Achromatopsia (no color) | #919191 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509CA9
#509CA9
oklch(64.9% 0.077 210)
- #BA7D73
#BA7D73
oklch(65% 0.078 29.6)
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 #509CA9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.021
- Sea #3C9992 ΔE 0.040
- Dull Teal #5F9E8F ΔE 0.042
- Grey Teal #5E9B8A ΔE 0.046
- Greyblue #77A1B5 ΔE 0.048
- Persian Green #2A9D8F ΔE 0.051
- Blue Grey #758DA3 ΔE 0.052
- Teal Green #0A9396 ΔE 0.056
Use #509CA9 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.