#668191
Closest named color: Grey Blue (#647D8E). oklch(58.8% 0.04 234.3), rgb(102, 129, 145).
Aa
Black text reads best on this color (5.11:1).
About this color
#668191 is a medium-dark, muted blue. In OKLCH its lightness is 59%, its chroma 0.040 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.012 away. Black text reads best on it, at 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 5.11:1 |
| White text | 4.10:1 |
Values
| HEX | #668191 |
| RGB | rgb(102, 129, 145) |
| HSL | hsl(202, 17%, 48%) |
| OKLCH | oklch(58.8% 0.04 234.3) |
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 #668191 | 4.10:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #668191 | 5.11:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #668191 text on white | 4.10:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #668191 text on black | 5.11:1 | AA | Lc -33.5 | 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 600.
-
Step 50
50
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D3DADF
oklch(88.4% 0.01 238.5)
-
Step 300
300
#B6C3CB
oklch(81% 0.018 234.6)
-
Step 400
400
#90A4B0
oklch(70.7% 0.029 234.2)
-
Step 500
500
#748E9D
oklch(63.2% 0.037 233.5)
-
Step 600
600 (this color)
#668191
oklch(58.8% 0.04 234.3)
-
Step 700
700
#4C6473
oklch(49% 0.037 236)
-
Step 800
800
#3F525D
oklch(42.7% 0.03 233.8)
-
Step 900
900
#35444C
oklch(37.7% 0.024 231.5)
-
Step 950
950
#1F282D
oklch(27% 0.016 232.4)
#668191 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) | #7A8092 | 0.027 |
| Deuteranopia (no green cones) | #747B91 | 0.024 |
| Tritanopia (no blue cones) | #598586 | 0.029 |
| Achromatopsia (no color) | #7D7D7D | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668191
#668191
oklch(58.8% 0.04 234.3)
- #907767
#907767
oklch(58.9% 0.039 54.4)
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 #668191, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.012
- Slate Gray #708090 ΔE 0.013
- Steel Grey #6F828A ΔE 0.016
- Battleship Grey #6B7C85 ΔE 0.020
- Steel #738595 ΔE 0.022
- Light Slate Gray #778899 ΔE 0.033
- Lavender Gray #7E7F9A ΔE 0.038
- Battleship Gray #6C757D ΔE 0.039
Use #668191 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.