#668A9F
Closest named color: Steel (#738595). oklch(61.4% 0.051 234.3), rgb(102, 138, 159).
Aa
Black text reads best on this color (5.70:1).
About this color
#668A9F is a medium-dark, muted blue. In OKLCH its lightness is 61%, its chroma 0.051 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Steel (#738595), ΔE 0.022 away. Black text reads best on it, at 5.70:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Steel (#738595) |
| Black text | 5.70:1 |
| White text | 3.68:1 |
Values
| HEX | #668A9F |
| RGB | rgb(102, 138, 159) |
| HSL | hsl(202, 23%, 51%) |
| OKLCH | oklch(61.4% 0.051 234.3) |
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 #668A9F | 3.68:1 | AA large text | Lc -69.9 | Content text, not long reading |
| Black text on #668A9F | 5.70:1 | AA | Lc 39.7 | Non-text elements, placeholder text |
| #668A9F text on white | 3.68:1 | AA large text | Lc 64.4 | Content text, not long reading |
| #668A9F text on black | 5.70:1 | AA | Lc -37.3 | 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
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D1DBE1
oklch(88.6% 0.014 233.8)
-
Step 300
300
#B2C4CF
oklch(81% 0.025 234.5)
-
Step 400
400
#89A5B6
oklch(70.6% 0.04 234.8)
-
Step 500
500 (this color)
#668A9F
oklch(61.4% 0.051 234.3)
-
Step 600
600
#52798F
oklch(55.6% 0.056 233.8)
-
Step 700
700
#42667A
oklch(49.1% 0.052 233.6)
-
Step 800
800
#375363
oklch(42.7% 0.043 234.2)
-
Step 900
900
#304551
oklch(37.8% 0.033 233.9)
-
Step 950
950
#1C282F
oklch(26.9% 0.021 234.2)
#668A9F 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) | #8089A0 | 0.034 |
| Deuteranopia (no green cones) | #78829F | 0.031 |
| Tritanopia (no blue cones) | #529091 | 0.039 |
| Achromatopsia (no color) | #858585 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668A9F
#668A9F
oklch(61.4% 0.051 234.3)
- #9D7D67
#9D7D67
oklch(61.4% 0.051 56.1)
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 #668A9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel #738595 ΔE 0.022
- Light Slate Gray #778899 ΔE 0.022
- Blue Grey #758DA3 ΔE 0.022
- Silver Lake Blue #778DA9 ΔE 0.028
- Dusty Blue #5A86AD ΔE 0.031
- Slate Gray #708090 ΔE 0.031
- Steel Grey #6F828A ΔE 0.033
- Off Blue #5684AE ΔE 0.038
Use #668A9F 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.