#509B9E
Closest named color: Cadet Blue (#5F9EA0). oklch(64.3% 0.075 198.9), rgb(80, 155, 158).
Aa
Black text reads best on this color (6.52:1).
About this color
#509B9E is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.075 and its hue 199°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.018 away. Black text reads best on it, at 6.52:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.52:1 |
| White text | 3.21:1 |
Values
| HEX | #509B9E |
| RGB | rgb(80, 155, 158) |
| HSL | hsl(182, 33%, 47%) |
| OKLCH | oklch(64.3% 0.075 198.9) |
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 #509B9E | 3.21:1 | AA large text | Lc -64.7 | Content text, not long reading |
| Black text on #509B9E | 6.52:1 | AA | Lc 44.8 | Non-text elements, placeholder text |
| #509B9E text on white | 3.21:1 | AA large text | Lc 59.3 | Large or bold text, headings |
| #509B9E text on black | 6.52:1 | AA | Lc -42.5 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#CBDDDE
oklch(88.4% 0.019 200.8)
-
Step 300
300
#A6C8C9
oklch(80.8% 0.036 198.7)
-
Step 400
400
#74ACAE
oklch(70.6% 0.059 198.7)
-
Step 500
500 (this color)
#509B9E
oklch(64.3% 0.075 198.9)
-
Step 600
600
#2A8285
oklch(55.7% 0.081 198.4)
-
Step 700
700
#1B6E71
oklch(49.2% 0.076 198.6)
-
Step 800
800
#1A595C
oklch(42.6% 0.062 199.7)
-
Step 900
900
#1D494B
oklch(37.6% 0.048 199.4)
-
Step 950
950
#122B2C
oklch(27% 0.031 198.9)
#509B9E 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) | #92959E | 0.077 |
| Deuteranopia (no green cones) | #858B9F | 0.072 |
| Tritanopia (no blue cones) | #20A09C | 0.031 |
| Achromatopsia (no color) | #8F8F8F | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509B9E
#509B9E
oklch(64.3% 0.075 198.9)
- #B67B7B
#B67B7B
oklch(64.3% 0.074 19.3)
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 #509B9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.018
- Sea #3C9992 ΔE 0.026
- Dull Teal #5F9E8F ΔE 0.029
- Grey Teal #5E9B8A ΔE 0.031
- Persian Green #2A9D8F ΔE 0.038
- Dusty Teal #4C9085 ΔE 0.043
- Blue Green #0F9B8E ΔE 0.046
- Teal Green #0A9396 ΔE 0.048
Use #509B9E 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.