#6599AA
Closest named color: Cadet Blue (#5F9EA0). oklch(65.3% 0.061 220.5), rgb(101, 153, 170).
Aa
Black text reads best on this color (6.69:1).
About this color
#6599AA is a medium-light, muted teal or cyan. In OKLCH its lightness is 65%, its chroma 0.061 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.025 away. Black text reads best on it, at 6.69:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.69:1 |
| White text | 3.13:1 |
Values
| HEX | #6599AA |
| RGB | rgb(101, 153, 170) |
| HSL | hsl(195, 29%, 53%) |
| OKLCH | oklch(65.3% 0.061 220.5) |
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 #6599AA | 3.13:1 | AA large text | Lc -63.8 | Content text, not long reading |
| Black text on #6599AA | 6.69:1 | AA | Lc 45.7 | Large or bold text, headings |
| #6599AA text on white | 3.13:1 | AA large text | Lc 58.4 | Large or bold text, headings |
| #6599AA text on black | 6.69:1 | AA | Lc -43.4 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBEE
oklch(93.6% 0.009 225.1)
-
Step 200
200
#CEDCE1
oklch(88.5% 0.017 221.1)
-
Step 300
300
#ADC6CE
oklch(81% 0.029 219)
-
Step 400
400
#80A8B5
oklch(70.7% 0.047 219.8)
-
Step 500
500 (this color)
#6599AA
oklch(65.3% 0.061 220.5)
-
Step 600
600
#437C8E
oklch(55.5% 0.066 220.6)
-
Step 700
700
#356979
oklch(49.2% 0.061 220.3)
-
Step 800
800
#2C5662
oklch(42.8% 0.051 218.6)
-
Step 900
900
#284750
oklch(37.8% 0.04 218.4)
-
Step 950
950
#18292F
oklch(26.9% 0.025 222.2)
#6599AA 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) | #8F96AB | 0.052 |
| Deuteranopia (no green cones) | #848EAA | 0.046 |
| Tritanopia (no blue cones) | #499F9E | 0.039 |
| Achromatopsia (no color) | #919191 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6599AA
#6599AA
oklch(65.3% 0.061 220.5)
- #B18474
#B18474
oklch(65.3% 0.061 40.4)
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 #6599AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.025
- Greyblue #77A1B5 ΔE 0.035
- Blue Grey #758DA3 ΔE 0.035
- Silver Lake Blue #778DA9 ΔE 0.038
- Dull Teal #5F9E8F ΔE 0.049
- Light Slate Gray #778899 ΔE 0.049
- Cool Gray #8D99AE ΔE 0.050
- Bluey Grey #89A0B0 ΔE 0.050
Use #6599AA 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.