#668AA3
Closest named color: Blue Grey (#758DA3). oklch(61.6% 0.055 239.1), rgb(102, 138, 163).
Aa
Black text reads best on this color (5.72:1).
About this color
#668AA3 is a medium-dark, muted blue. In OKLCH its lightness is 62%, its chroma 0.055 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Grey (#758DA3), ΔE 0.022 away. Black text reads best on it, at 5.72:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Blue Grey (#758DA3) |
| Black text | 5.72:1 |
| White text | 3.66:1 |
Values
| HEX | #668AA3 |
| RGB | rgb(102, 138, 163) |
| HSL | hsl(205, 25%, 52%) |
| OKLCH | oklch(61.6% 0.055 239.1) |
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 #668AA3 | 3.66:1 | AA large text | Lc -69.7 | Content text, not long reading |
| Black text on #668AA3 | 5.72:1 | AA | Lc 39.9 | Non-text elements, placeholder text |
| #668AA3 text on white | 3.66:1 | AA large text | Lc 64.2 | Content text, not long reading |
| #668AA3 text on black | 5.72:1 | AA | Lc -37.5 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#D1DBE2
oklch(88.6% 0.015 238)
-
Step 300
300
#B1C3D1
oklch(80.8% 0.028 241.2)
-
Step 400
400
#88A5B9
oklch(70.7% 0.044 238.4)
-
Step 500
500 (this color)
#668AA3
oklch(61.6% 0.055 239.1)
-
Step 600
600
#527893
oklch(55.5% 0.06 240.1)
-
Step 700
700
#42657D
oklch(49% 0.056 239.4)
-
Step 800
800
#375366
oklch(42.8% 0.046 238.9)
-
Step 900
900
#304453
oklch(37.6% 0.036 241.3)
-
Step 950
950
#1C2831
oklch(27% 0.024 241.1)
#668AA3 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) | #7F89A4 | 0.032 |
| Deuteranopia (no green cones) | #7783A3 | 0.028 |
| Tritanopia (no blue cones) | #519092 | 0.043 |
| Achromatopsia (no color) | #858585 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668AA3
#668AA3
oklch(61.6% 0.055 239.1)
- #9E7D64
#9E7D64
oklch(61.5% 0.055 58.7)
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 #668AA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Grey #758DA3 ΔE 0.022
- Light Slate Gray #778899 ΔE 0.024
- Steel #738595 ΔE 0.025
- Silver Lake Blue #778DA9 ΔE 0.026
- Dusty Blue #5A86AD ΔE 0.026
- Off Blue #5684AE ΔE 0.034
- Slate Gray #708090 ΔE 0.034
- Faded Blue #658CBB ΔE 0.036
Use #668AA3 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.