#666D98
Closest named color: Dull Blue (#49759C). oklch(54.6% 0.068 276.8), rgb(102, 109, 152).
Aa
White text reads best on this color (4.99:1).
About this color
#666D98 is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.068 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.039 away. White text reads best on it, at 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.20:1 |
| White text | 4.99:1 |
Values
| HEX | #666D98 |
| RGB | rgb(102, 109, 152) |
| HSL | hsl(232, 20%, 50%) |
| OKLCH | oklch(54.6% 0.068 276.8) |
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 #666D98 | 4.99:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #666D98 | 4.20:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #666D98 text on white | 4.99:1 | AA | Lc 74.5 | Content text, not long reading |
| #666D98 text on black | 4.20:1 | AA large text | Lc -27.2 | Dividers and decoration only |
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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9F0
oklch(93.5% 0.009 279.7)
-
Step 200
200
#D6D8E5
oklch(88.5% 0.018 279)
-
Step 300
300
#BBBFD5
oklch(80.8% 0.031 277.5)
-
Step 400
400
#989EBF
oklch(70.6% 0.049 277)
-
Step 500
500
#7F86AF
oklch(63% 0.062 276.9)
-
Step 600
600 (this color)
#666D98
oklch(54.6% 0.068 276.8)
-
Step 700
700
#575E84
oklch(49.2% 0.062 275.9)
-
Step 800
800
#474C6C
oklch(42.6% 0.054 277)
-
Step 900
900
#3C4057
oklch(37.8% 0.04 276.7)
-
Step 950
950
#232533
oklch(26.9% 0.026 278.2)
#666D98 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) | #60719A | 0.013 |
| Deuteranopia (no green cones) | #5D6E97 | 0.013 |
| Tritanopia (no blue cones) | #59757C | 0.060 |
| Achromatopsia (no color) | #6F6F6F | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666D98
#666D98
oklch(54.6% 0.068 276.8)
- #7C7141
#7C7141
oklch(54.7% 0.068 96.8)
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 #666D98, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.039
- Metallic Blue #4F738E ΔE 0.040
- Stormy Blue #507B9C ΔE 0.045
- Grey Purple #826D8C ΔE 0.046
- Dark Lavender #856798 ΔE 0.049
- Muted Blue #3B719F ΔE 0.050
- Cerulean #457B9D ΔE 0.051
- Flat Blue #3C73A8 ΔE 0.052
Use #666D98 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.