#66959F
Closest named color: Cadet Blue (#5F9EA0). oklch(64% 0.053 212.4), rgb(102, 149, 159).
Aa
Black text reads best on this color (6.36:1).
About this color
#66959F is a medium-light, muted teal or cyan. In OKLCH its lightness is 64%, its chroma 0.053 and its hue 212°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.026 away. Black text reads best on it, at 6.36:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.36:1 |
| White text | 3.29:1 |
Values
| HEX | #66959F |
| RGB | rgb(102, 149, 159) |
| HSL | hsl(191, 23%, 51%) |
| OKLCH | oklch(64% 0.053 212.4) |
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 #66959F | 3.29:1 | AA large text | Lc -65.8 | Content text, not long reading |
| Black text on #66959F | 6.36:1 | AA | Lc 43.8 | Non-text elements, placeholder text |
| #66959F text on white | 3.29:1 | AA large text | Lc 60.3 | Content text, not long reading |
| #66959F text on black | 6.36:1 | AA | Lc -41.4 | 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
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#CFDCDF
oklch(88.6% 0.015 213.1)
-
Step 300
300
#AFC5CA
oklch(80.8% 0.025 212.9)
-
Step 400
400
#83A8B0
oklch(70.7% 0.042 212.4)
-
Step 500
500 (this color)
#66959F
oklch(64% 0.053 212.4)
-
Step 600
600
#497C87
oklch(55.5% 0.057 213)
-
Step 700
700
#3A6973
oklch(49.1% 0.054 212.9)
-
Step 800
800
#31565D
oklch(42.8% 0.044 211)
-
Step 900
900
#2B474C
oklch(37.8% 0.035 210)
-
Step 950
950
#1A292D
oklch(26.9% 0.022 216.2)
#66959F 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) | #8D92A0 | 0.050 |
| Deuteranopia (no green cones) | #838A9F | 0.046 |
| Tritanopia (no blue cones) | #519998 | 0.028 |
| Achromatopsia (no color) | #8D8D8D | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66959F
#66959F
oklch(64% 0.053 212.4)
- #AA8178
#AA8178
oklch(64% 0.053 32.6)
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 #66959F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.026
- Blue Grey #758DA3 ΔE 0.030
- Silver Lake Blue #778DA9 ΔE 0.037
- Light Slate Gray #778899 ΔE 0.039
- Dull Teal #5F9E8F ΔE 0.042
- Grey Teal #5E9B8A ΔE 0.043
- Steel #738595 ΔE 0.045
- Sea #3C9992 ΔE 0.047
Use #66959F 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.