#669E9B
Closest named color: Cadet Blue (#5F9EA0). oklch(66% 0.059 191.5), rgb(102, 158, 155).
Aa
Black text reads best on this color (6.92:1).
About this color
#669E9B is a medium-light, muted teal or cyan. In OKLCH its lightness is 66%, its chroma 0.059 and its hue 192°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.010 away. Black text reads best on it, at 6.92:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.92:1 |
| White text | 3.03:1 |
Values
| HEX | #669E9B |
| RGB | rgb(102, 158, 155) |
| HSL | hsl(177, 22%, 51%) |
| OKLCH | oklch(66% 0.059 191.5) |
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 #669E9B | 3.03:1 | AA large text | Lc -62.4 | Content text, not long reading |
| Black text on #669E9B | 6.92:1 | AA | Lc 47.0 | Large or bold text, headings |
| #669E9B text on white | 3.03:1 | AA large text | Lc 57.0 | Large or bold text, headings |
| #669E9B text on black | 6.92:1 | AA | Lc -44.8 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E4ECEB
oklch(93.7% 0.009 188.1)
-
Step 200
200
#CEDDDC
oklch(88.6% 0.016 192)
-
Step 300
300
#ACC7C5
oklch(80.9% 0.029 191.1)
-
Step 400
400
#7FAAA8
oklch(70.6% 0.046 192.6)
-
Step 500
500 (this color)
#669E9B
oklch(66% 0.059 191.5)
-
Step 600
600
#427F7D
oklch(55.5% 0.064 192.7)
-
Step 700
700
#336C69
oklch(49.2% 0.06 190.8)
-
Step 800
800
#2B5856
oklch(42.8% 0.05 191.7)
-
Step 900
900
#284847
oklch(37.7% 0.038 193.1)
-
Step 950
950
#182A29
oklch(26.9% 0.024 191.4)
#669E9B 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) | #98999B | 0.063 |
| Deuteranopia (no green cones) | #8D919C | 0.058 |
| Tritanopia (no blue cones) | #51A19D | 0.020 |
| Achromatopsia (no color) | #949494 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #669E9B
#669E9B
oklch(66% 0.059 191.5)
- #B38389
#B38389
oklch(65.9% 0.06 10.5)
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 #669E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.010
- Dull Teal #5F9E8F ΔE 0.020
- Grey Teal #5E9B8A ΔE 0.027
- Sea #3C9992 ΔE 0.044
- Greyblue #77A1B5 ΔE 0.045
- Persian Green #2A9D8F ΔE 0.053
- Bluegrey #85A3B2 ΔE 0.053
- Greeny Grey #7EA07A ΔE 0.054
Use #669E9B 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.