#509FAB
Closest named color: Cadet Blue (#5F9EA0). oklch(65.7% 0.079 208.4), rgb(80, 159, 171).
Aa
Black text reads best on this color (6.88:1).
About this color
#509FAB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.079 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.019 away. Black text reads best on it, at 6.88:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.88:1 |
| White text | 3.04:1 |
Values
| HEX | #509FAB |
| RGB | rgb(80, 159, 171) |
| HSL | hsl(188, 36%, 49%) |
| OKLCH | oklch(65.7% 0.079 208.4) |
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 #509FAB | 3.04:1 | AA large text | Lc -62.5 | Content text, not long reading |
| Black text on #509FAB | 6.88:1 | AA | Lc 46.9 | Large or bold text, headings |
| #509FAB text on white | 3.04:1 | AA large text | Lc 57.1 | Large or bold text, headings |
| #509FAB 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#CADDE1
oklch(88.5% 0.021 211.8)
-
Step 300
300
#A4C8CE
oklch(80.9% 0.039 208.8)
-
Step 400
400
#71ACB5
oklch(70.7% 0.062 208)
-
Step 500
500 (this color)
#509FAB
oklch(65.7% 0.079 208.4)
-
Step 600
600
#22818E
oklch(55.6% 0.086 208.6)
-
Step 700
700
#116D79
oklch(49.1% 0.08 208.8)
-
Step 800
800
#145962
oklch(42.7% 0.066 208)
-
Step 900
900
#1A4950
oklch(37.7% 0.052 208.7)
-
Step 950
950
#112B2F
oklch(27% 0.033 208.6)
#509FAB 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) | #939AAC | 0.076 |
| Deuteranopia (no green cones) | #858FAB | 0.070 |
| Tritanopia (no blue cones) | #04A5A3 | 0.041 |
| Achromatopsia (no color) | #949494 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509FAB
#509FAB
oklch(65.7% 0.079 208.4)
- #BD7F76
#BD7F76
oklch(65.7% 0.079 28.5)
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 #509FAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.019
- Dull Teal #5F9E8F ΔE 0.042
- Sea #3C9992 ΔE 0.043
- Greyblue #77A1B5 ΔE 0.044
- Grey Teal #5E9B8A ΔE 0.047
- Persian Green #2A9D8F ΔE 0.052
- Turquoise Blue #06B1C4 ΔE 0.056
- Blue Grey #758DA3 ΔE 0.058
Use #509FAB 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.