#66939B
Closest named color: Blue Grey (#758DA3). oklch(63.4% 0.05 209.8), rgb(102, 147, 155).
Aa
Black text reads best on this color (6.21:1).
About this color
#66939B is a medium-light, muted teal or cyan. In OKLCH its lightness is 63%, its chroma 0.050 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Grey (#758DA3), ΔE 0.030 away. Black text reads best on it, at 6.21:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (63%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Blue Grey (#758DA3) |
| Black text | 6.21:1 |
| White text | 3.38:1 |
Values
| HEX | #66939B |
| RGB | rgb(102, 147, 155) |
| HSL | hsl(189, 21%, 50%) |
| OKLCH | oklch(63.4% 0.05 209.8) |
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 #66939B | 3.38:1 | AA large text | Lc -66.7 | Content text, not long reading |
| Black text on #66939B | 6.21:1 | AA | Lc 42.8 | Non-text elements, placeholder text |
| #66939B text on white | 3.38:1 | AA large text | Lc 61.2 | Content text, not long reading |
| #66939B text on black | 6.21:1 | AA | Lc -40.5 | 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
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#CFDCDE
oklch(88.5% 0.014 207.9)
-
Step 300
300
#AFC5C9
oklch(80.8% 0.025 209.8)
-
Step 400
400
#85A8AE
oklch(70.8% 0.039 209.1)
-
Step 500
500 (this color)
#66939B
oklch(63.4% 0.05 209.8)
-
Step 600
600
#4B7C85
oklch(55.5% 0.055 210.5)
-
Step 700
700
#3C6971
oklch(49.2% 0.051 210.1)
-
Step 800
800
#32555C
oklch(42.6% 0.042 211.7)
-
Step 900
900
#2C474B
oklch(37.8% 0.033 207.6)
-
Step 950
950
#1A292C
oklch(26.9% 0.021 211.4)
#66939B 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) | #8B909C | 0.047 |
| Deuteranopia (no green cones) | #83899B | 0.044 |
| Tritanopia (no blue cones) | #539795 | 0.026 |
| Achromatopsia (no color) | #8C8C8C | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66939B
#66939B
oklch(63.4% 0.05 209.8)
- #A77F78
#A77F78
oklch(63.3% 0.051 29.9)
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 #66939B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Grey #758DA3 ΔE 0.030
- Cadet Blue #5F9EA0 ΔE 0.030
- Light Slate Gray #778899 ΔE 0.035
- Silver Lake Blue #778DA9 ΔE 0.038
- Steel #738595 ΔE 0.040
- Grey Teal #5E9B8A ΔE 0.041
- Dull Teal #5F9E8F ΔE 0.043
- Sea #3C9992 ΔE 0.046
Use #66939B 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.