#509FBC
Closest named color: Greyblue (#77A1B5). oklch(66.4% 0.088 224.6), rgb(80, 159, 188).
Aa
Black text reads best on this color (7.02:1).
About this color
#509FBC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.088 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.041 away. Black text reads best on it, at 7.02:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.02:1 |
| White text | 2.98:1 |
Values
| HEX | #509FBC |
| RGB | rgb(80, 159, 188) |
| HSL | hsl(196, 45%, 53%) |
| OKLCH | oklch(66.4% 0.088 224.6) |
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 #509FBC | 2.98:1 | Fails | Lc -61.7 | Content text, not long reading |
| Black text on #509FBC | 7.02:1 | AAA | Lc 47.7 | Large or bold text, headings |
| #509FBC text on white | 2.98:1 | Fails | Lc 56.3 | Large or bold text, headings |
| #509FBC text on black | 7.02:1 | AAA | Lc -45.4 | Large or bold text, headings |
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
#E1ECF0
oklch(93.6% 0.013 221.4)
-
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
#70AAC1
oklch(70.7% 0.069 225)
-
Step 500
500 (this color)
#509FBC
oklch(66.4% 0.088 224.6)
-
Step 600
600
#1E7F9D
oklch(55.7% 0.096 224.1)
-
Step 700
700
#0C6B86
oklch(49.1% 0.089 224)
-
Step 800
800
#11576D
oklch(42.6% 0.074 224.5)
-
Step 900
900
#184858
oklch(37.7% 0.058 223.7)
-
Step 950
950
#102A34
oklch(27% 0.037 225.8)
#509FBC 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) | #8F9CBE | 0.069 |
| Deuteranopia (no green cones) | #7F90BC | 0.062 |
| Tritanopia (no blue cones) | #00A8A8 | 0.057 |
| Achromatopsia (no color) | #959595 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509FBC
#509FBC
oklch(66.4% 0.088 224.6)
- #C18266
#C18266
oklch(66.4% 0.088 44.7)
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 #509FBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.041
- Cadet Blue #5F9EA0 ΔE 0.042
- Turquoise Blue #06B1C4 ΔE 0.053
- Faded Blue #658CBB ΔE 0.055
- Silver Lake Blue #778DA9 ΔE 0.059
- Bluegrey #85A3B2 ΔE 0.059
- Blue Grey #758DA3 ΔE 0.060
- Bluey Grey #89A0B0 ΔE 0.062
Use #509FBC 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.