#669E9F
Closest named color: Cadet Blue (#5F9EA0). oklch(66.1% 0.059 197.3), rgb(102, 158, 159).
Aa
Black text reads best on this color (6.95:1).
About this color
#669E9F is a medium-light, muted teal or cyan. In OKLCH its lightness is 66%, its chroma 0.059 and its hue 197°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.007 away. Black text reads best on it, at 6.95:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.95:1 |
| White text | 3.01:1 |
Values
| HEX | #669E9F |
| RGB | rgb(102, 158, 159) |
| HSL | hsl(181, 23%, 51%) |
| OKLCH | oklch(66.1% 0.059 197.3) |
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 #669E9F | 3.01:1 | AA large text | Lc -62.2 | Content text, not long reading |
| Black text on #669E9F | 6.95:1 | AA | Lc 47.2 | Large or bold text, headings |
| #669E9F text on white | 3.01:1 | AA large text | Lc 56.9 | Large or bold text, headings |
| #669E9F text on black | 6.95:1 | AA | Lc -44.9 | 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
#E4ECEC
oklch(93.7% 0.009 197)
-
Step 200
200
#CEDDDD
oklch(88.6% 0.016 196.9)
-
Step 300
300
#ACC7C7
oklch(81% 0.029 196.6)
-
Step 400
400
#7FAAAB
oklch(70.7% 0.046 197.9)
-
Step 500
500 (this color)
#669E9F
oklch(66.1% 0.059 197.3)
-
Step 600
600
#417F80
oklch(55.6% 0.064 196.8)
-
Step 700
700
#326B6C
oklch(49% 0.06 196.9)
-
Step 800
800
#2B5758
oklch(42.6% 0.049 197.4)
-
Step 900
900
#274849
oklch(37.7% 0.039 198.1)
-
Step 950
950
#182A2B
oklch(27% 0.024 200.3)
#669E9F 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) | #97999F | 0.061 |
| Deuteranopia (no green cones) | #8C919F | 0.057 |
| Tritanopia (no blue cones) | #4FA29E | 0.023 |
| Achromatopsia (no color) | #949494 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #669E9F
#669E9F
oklch(66.1% 0.059 197.3)
- #B48485
#B48485
oklch(66.1% 0.059 17.4)
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 #669E9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.007
- Dull Teal #5F9E8F ΔE 0.026
- Grey Teal #5E9B8A ΔE 0.033
- Greyblue #77A1B5 ΔE 0.040
- Sea #3C9992 ΔE 0.047
- Bluegrey #85A3B2 ΔE 0.050
- Bluey Grey #89A0B0 ΔE 0.051
- Blue Grey #758DA3 ΔE 0.053
Use #669E9F 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.