#509FA3
Closest named color: Cadet Blue (#5F9EA0). oklch(65.4% 0.078 199.8), rgb(80, 159, 163).
Aa
Black text reads best on this color (6.82:1).
About this color
#509FA3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.078 and its hue 200°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.013 away. Black text reads best on it, at 6.82:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.82:1 |
| White text | 3.07:1 |
Values
| HEX | #509FA3 |
| RGB | rgb(80, 159, 163) |
| HSL | hsl(183, 34%, 48%) |
| OKLCH | oklch(65.4% 0.078 199.8) |
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 #509FA3 | 3.07:1 | AA large text | Lc -62.9 | Content text, not long reading |
| Black text on #509FA3 | 6.82:1 | AA | Lc 46.6 | Large or bold text, headings |
| #509FA3 text on white | 3.07:1 | AA large text | Lc 57.5 | Large or bold text, headings |
| #509FA3 text on black | 6.82:1 | AA | Lc -44.3 | 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
#E2ECED
oklch(93.6% 0.011 204.1)
-
Step 200
200
#CADEDE
oklch(88.6% 0.021 196.8)
-
Step 300
300
#A5C9CA
oklch(81% 0.038 198.5)
-
Step 400
400
#72ACAF
oklch(70.6% 0.06 200)
-
Step 500
500 (this color)
#509FA3
oklch(65.4% 0.078 199.8)
-
Step 600
600
#238287
oklch(55.6% 0.085 200.3)
-
Step 700
700
#136E72
oklch(49.1% 0.079 199.6)
-
Step 800
800
#155A5D
oklch(42.8% 0.065 199.3)
-
Step 900
900
#1A4A4C
oklch(37.8% 0.051 199)
-
Step 950
950
#112B2D
oklch(27% 0.032 202.1)
#509FA3 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) | #9599A3 | 0.079 |
| Deuteranopia (no green cones) | #888FA4 | 0.074 |
| Tritanopia (no blue cones) | #17A4A0 | 0.033 |
| Achromatopsia (no color) | #939393 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509FA3
#509FA3
oklch(65.4% 0.078 199.8)
- #BB7D7D
#BB7D7D
oklch(65.3% 0.078 19.4)
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 #509FA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.013
- Dull Teal #5F9E8F ΔE 0.030
- Sea #3C9992 ΔE 0.034
- Grey Teal #5E9B8A ΔE 0.035
- Persian Green #2A9D8F ΔE 0.042
- Greyblue #77A1B5 ΔE 0.051
- Blue Green #0F9B8E ΔE 0.051
- Dusty Teal #4C9085 ΔE 0.054
Use #509FA3 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.