#509CBC
Closest named color: Greyblue (#77A1B5). oklch(65.7% 0.089 227.9), rgb(80, 156, 188).
Aa
Black text reads best on this color (6.82:1).
About this color
#509CBC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.089 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.045 away. Black text reads best on it, at 6.82:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 6.82:1 |
| White text | 3.07:1 |
Values
| HEX | #509CBC |
| RGB | rgb(80, 156, 188) |
| HSL | hsl(198, 45%, 53%) |
| OKLCH | oklch(65.7% 0.089 227.9) |
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 #509CBC | 3.07:1 | AA large text | Lc -62.9 | Content text, not long reading |
| Black text on #509CBC | 6.82:1 | AA | Lc 46.5 | Large or bold text, headings |
| #509CBC text on white | 3.07:1 | AA large text | Lc 57.5 | Large or bold text, headings |
| #509CBC text on black | 6.82:1 | AA | Lc -44.2 | 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
#E2ECF1
oklch(93.7% 0.013 228.9)
-
Step 200
200
#C9DDE6
oklch(88.5% 0.025 226.5)
-
Step 300
300
#A4C7D7
oklch(80.9% 0.044 227.3)
-
Step 400
400
#71AAC3
oklch(70.8% 0.07 227.4)
-
Step 500
500 (this color)
#509CBC
oklch(65.7% 0.089 227.9)
-
Step 600
600
#237EA0
oklch(55.7% 0.097 228.1)
-
Step 700
700
#136A89
oklch(49.1% 0.09 228.3)
-
Step 800
800
#15576F
oklch(42.8% 0.074 227.4)
-
Step 900
900
#1A475A
oklch(37.6% 0.058 229.1)
-
Step 950
950
#112A35
oklch(27.1% 0.037 229)
#509CBC 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) | #8B99BE | 0.065 |
| Deuteranopia (no green cones) | #7C8EBC | 0.058 |
| Tritanopia (no blue cones) | #00A5A6 | 0.060 |
| Achromatopsia (no color) | #939393 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509CBC
#509CBC
oklch(65.7% 0.089 227.9)
- #BE8061
#BE8061
oklch(65.6% 0.089 47.3)
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 #509CBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.045
- Cadet Blue #5F9EA0 ΔE 0.046
- Faded Blue #658CBB ΔE 0.047
- Silver Lake Blue #778DA9 ΔE 0.054
- Blue Grey #758DA3 ΔE 0.055
- Dusty Blue #5A86AD ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.060
- Bluegrey #85A3B2 ΔE 0.064
Use #509CBC 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.