#509AAB
Closest named color: Cadet Blue (#5F9EA0). oklch(64.5% 0.078 214.6), rgb(80, 154, 171).
Aa
Black text reads best on this color (6.55:1).
About this color
#509AAB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.078 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.027 away. Black text reads best on it, at 6.55:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.55:1 |
| White text | 3.20:1 |
Values
| HEX | #509AAB |
| RGB | rgb(80, 154, 171) |
| HSL | hsl(191, 36%, 49%) |
| OKLCH | oklch(64.5% 0.078 214.6) |
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 #509AAB | 3.20:1 | AA large text | Lc -64.5 | Content text, not long reading |
| Black text on #509AAB | 6.55:1 | AA | Lc 45.0 | Non-text elements, placeholder text |
| #509AAB text on white | 3.20:1 | AA large text | Lc 59.1 | Large or bold text, headings |
| #509AAB text on black | 6.55:1 | AA | Lc -42.6 | 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
#CADDE2
oklch(88.5% 0.022 215.3)
-
Step 300
300
#A6C7D0
oklch(80.8% 0.038 216.1)
-
Step 400
400
#74ABB8
oklch(70.8% 0.061 214.1)
-
Step 500
500 (this color)
#509AAB
oklch(64.5% 0.078 214.6)
-
Step 600
600
#298092
oklch(55.7% 0.085 214.4)
-
Step 700
700
#1A6C7C
oklch(49.2% 0.078 214.1)
-
Step 800
800
#195865
oklch(42.7% 0.065 214.4)
-
Step 900
900
#1C4852
oklch(37.5% 0.051 215)
-
Step 950
950
#122A30
oklch(26.8% 0.032 216)
#509AAB 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) | #8E96AC | 0.071 |
| Deuteranopia (no green cones) | #808BAB | 0.065 |
| Tritanopia (no blue cones) | #0AA19F | 0.046 |
| Achromatopsia (no color) | #909090 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509AAB
#509AAB
oklch(64.5% 0.078 214.6)
- #B87D6E
#B87D6E
oklch(64.6% 0.077 34.9)
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 #509AAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.027
- Sea #3C9992 ΔE 0.043
- Dull Teal #5F9E8F ΔE 0.048
- Blue Grey #758DA3 ΔE 0.049
- Greyblue #77A1B5 ΔE 0.049
- Grey Teal #5E9B8A ΔE 0.051
- Silver Lake Blue #778DA9 ΔE 0.052
- Teal Green #0A9396 ΔE 0.055
Use #509AAB 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.