#509E99
Closest named color: Dull Teal (#5F9E8F). oklch(64.8% 0.078 189.9), rgb(80, 158, 153).
Aa
Black text reads best on this color (6.69:1).
About this color
#509E99 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.078 and its hue 190°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Teal (#5F9E8F), ΔE 0.019 away. Black text reads best on it, at 6.69:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Dull Teal (#5F9E8F) |
| Black text | 6.69:1 |
| White text | 3.13:1 |
Values
| HEX | #509E99 |
| RGB | rgb(80, 158, 153) |
| HSL | hsl(176, 33%, 47%) |
| OKLCH | oklch(64.8% 0.078 189.9) |
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 #509E99 | 3.13:1 | AA large text | Lc -63.7 | Content text, not long reading |
| Black text on #509E99 | 6.69:1 | AA | Lc 45.8 | Large or bold text, headings |
| #509E99 text on white | 3.13:1 | AA large text | Lc 58.3 | Large or bold text, headings |
| #509E99 text on black | 6.69:1 | AA | Lc -43.5 | 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
#CADEDC
oklch(88.5% 0.022 189.5)
-
Step 300
300
#A6C9C6
oklch(81% 0.038 190)
-
Step 400
400
#73ADA9
oklch(70.7% 0.061 190.4)
-
Step 500
500 (this color)
#509E99
oklch(64.8% 0.078 189.9)
-
Step 600
600
#27837E
oklch(55.6% 0.084 189.7)
-
Step 700
700
#176F6A
oklch(49.2% 0.079 189.1)
-
Step 800
800
#175A57
oklch(42.6% 0.065 190.6)
-
Step 900
900
#1C4A47
oklch(37.6% 0.05 189.4)
-
Step 950
950
#122B2A
oklch(26.9% 0.031 192.1)
#509E99 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) | #969799 | 0.082 |
| Deuteranopia (no green cones) | #898D9A | 0.078 |
| Tritanopia (no blue cones) | #24A29C | 0.026 |
| Achromatopsia (no color) | #919191 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509E99
#509E99
oklch(64.8% 0.078 189.9)
- #B87B84
#B87B84
oklch(64.8% 0.077 9.7)
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 #509E99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Teal #5F9E8F ΔE 0.019
- Cadet Blue #5F9EA0 ΔE 0.019
- Grey Teal #5E9B8A ΔE 0.022
- Sea #3C9992 ΔE 0.025
- Persian Green #2A9D8F ΔE 0.032
- Blue Green #0F9B8E ΔE 0.042
- Dusty Teal #4C9085 ΔE 0.045
- Teal Green #0A9396 ΔE 0.053
Use #509E99 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.