#509A91
Closest named color: Sea (#3C9992). oklch(63.6% 0.076 185.2), rgb(80, 154, 145).
Aa
Black text reads best on this color (6.37:1).
About this color
#509A91 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.076 and its hue 185°. Its hue sits on the cool side of the wheel. The nearest named color is Sea (#3C9992), ΔE 0.016 away. Black text reads best on it, at 6.37:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Sea (#3C9992) |
| Black text | 6.37:1 |
| White text | 3.29:1 |
Values
| HEX | #509A91 |
| RGB | rgb(80, 154, 145) |
| HSL | hsl(173, 32%, 46%) |
| OKLCH | oklch(63.6% 0.076 185.2) |
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 #509A91 | 3.29:1 | AA large text | Lc -65.6 | Content text, not long reading |
| Black text on #509A91 | 6.37:1 | AA | Lc 43.9 | Non-text elements, placeholder text |
| #509A91 text on white | 3.29:1 | AA large text | Lc 60.2 | Content text, not long reading |
| #509A91 text on black | 6.37:1 | AA | Lc -41.5 | 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
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEB
oklch(93.5% 0.011 189.8)
-
Step 200
200
#CBDEDB
oklch(88.6% 0.021 185.4)
-
Step 300
300
#A7C9C4
oklch(81% 0.037 185.6)
-
Step 400
400
#76ADA5
oklch(70.7% 0.059 184.6)
-
Step 500
500 (this color)
#509A91
oklch(63.6% 0.076 185.2)
-
Step 600
600
#2D837A
oklch(55.6% 0.082 185.4)
-
Step 700
700
#1E6F66
oklch(49.2% 0.077 184.3)
-
Step 800
800
#1C5A54
oklch(42.7% 0.063 186.1)
-
Step 900
900
#1E4A45
oklch(37.7% 0.049 185.4)
-
Step 950
950
#132B28
oklch(26.8% 0.031 185.1)
#509A91 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) | #949391 | 0.081 |
| Deuteranopia (no green cones) | #878A92 | 0.075 |
| Tritanopia (no blue cones) | #2C9D97 | 0.024 |
| Achromatopsia (no color) | #8E8E8E | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509A91
#509A91
oklch(63.6% 0.076 185.2)
- #B37884
#B37884
oklch(63.7% 0.075 6.1)
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 #509A91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea #3C9992 ΔE 0.016
- Grey Teal #5E9B8A ΔE 0.017
- Dull Teal #5F9E8F ΔE 0.020
- Persian Green #2A9D8F ΔE 0.027
- Cadet Blue #5F9EA0 ΔE 0.029
- Dusty Teal #4C9085 ΔE 0.031
- Blue Green #0F9B8E ΔE 0.035
- Teal Green #0A9396 ΔE 0.046
Use #509A91 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.