#509DBB
Closest named color: Cadet Blue (#5F9EA0). oklch(65.9% 0.088 226), rgb(80, 157, 187).
Aa
Black text reads best on this color (6.88:1).
About this color
#509DBB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.088 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.043 away. Black text reads best on it, at 6.88:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.88:1 |
| White text | 3.05:1 |
Values
| HEX | #509DBB |
| RGB | rgb(80, 157, 187) |
| HSL | hsl(197, 44%, 52%) |
| OKLCH | oklch(65.9% 0.088 226) |
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 #509DBB | 3.05:1 | AA large text | Lc -62.5 | Content text, not long reading |
| Black text on #509DBB | 6.88:1 | AA | Lc 46.9 | Large or bold text, headings |
| #509DBB text on white | 3.05:1 | AA large text | Lc 57.2 | Large or bold text, headings |
| #509DBB text on black | 6.88:1 | AA | Lc -44.6 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#C9DDE5
oklch(88.5% 0.024 223.7)
-
Step 300
300
#A4C7D6
oklch(80.9% 0.043 225.7)
-
Step 400
400
#71AAC2
oklch(70.7% 0.069 226.4)
-
Step 500
500 (this color)
#509DBB
oklch(65.9% 0.088 226)
-
Step 600
600
#227E9E
oklch(55.5% 0.096 226.4)
-
Step 700
700
#116A87
oklch(49% 0.089 226.4)
-
Step 800
800
#14576E
oklch(42.8% 0.074 226.2)
-
Step 900
900
#1A4859
oklch(37.8% 0.057 225.8)
-
Step 950
950
#112A34
oklch(27% 0.036 226.6)
#509DBB 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) | #8D9ABD | 0.068 |
| Deuteranopia (no green cones) | #7D8FBB | 0.058 |
| Tritanopia (no blue cones) | #00A6A7 | 0.057 |
| Achromatopsia (no color) | #949494 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509DBB
#509DBB
oklch(65.9% 0.088 226)
- #BF8163
#BF8163
oklch(65.9% 0.088 46.6)
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 #509DBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.043
- Greyblue #77A1B5 ΔE 0.043
- Faded Blue #658CBB ΔE 0.050
- Silver Lake Blue #778DA9 ΔE 0.055
- Blue Grey #758DA3 ΔE 0.056
- Turquoise Blue #06B1C4 ΔE 0.058
- Bluegrey #85A3B2 ΔE 0.062
- Dusty Blue #5A86AD ΔE 0.063
Use #509DBB 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.