#66779C
Closest named color: Stormy Blue (#507B9C). oklch(57% 0.061 265.4), rgb(102, 119, 156).
Aa
Black text reads best on this color (4.68:1).
About this color
#66779C is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.061 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.028 away. Black text reads best on it, at 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #66779C |
| RGB | rgb(102, 119, 156) |
| HSL | hsl(221, 21%, 51%) |
| OKLCH | oklch(57% 0.061 265.4) |
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 #66779C | 4.48:1 | AA large text | Lc -76.6 | Fine for body text |
| Black text on #66779C | 4.68:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #66779C text on white | 4.48:1 | AA large text | Lc 71.1 | Content text, not long reading |
| #66779C text on black | 4.68:1 | AA | Lc -30.6 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D4D9E4
oklch(88.5% 0.016 266.3)
-
Step 300
300
#B8C1D3
oklch(81% 0.027 264.4)
-
Step 400
400
#93A1BD
oklch(70.8% 0.044 264.2)
-
Step 500
500
#7989AC
oklch(63% 0.056 265.6)
-
Step 600
600 (this color)
#66779C
oklch(57% 0.061 265.4)
-
Step 700
700
#516081
oklch(49% 0.056 265.5)
-
Step 800
800
#434F69
oklch(42.8% 0.046 265.3)
-
Step 900
900
#384155
oklch(37.6% 0.036 265.8)
-
Step 950
950
#212632
oklch(26.9% 0.024 267.1)
#66779C 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) | #6B7A9E | 0.012 |
| Deuteranopia (no green cones) | #66759B | 0.006 |
| Tritanopia (no blue cones) | #567E84 | 0.053 |
| Achromatopsia (no color) | #777777 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66779C
#66779C
oklch(57% 0.061 265.4)
- #88754D
#88754D
oklch(57% 0.061 85.2)
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 #66779C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.028
- Grey Blue #647D8E ΔE 0.032
- Dull Blue #49759C ΔE 0.037
- Cerulean #457B9D ΔE 0.038
- Metallic Blue #4F738E ΔE 0.039
- Slate Gray #708090 ΔE 0.040
- Off Blue #5684AE ΔE 0.041
- Battleship Grey #6B7C85 ΔE 0.044
Use #66779C 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.