#66798B
Closest named color: Grey Blue (#647D8E). oklch(56.7% 0.036 247), rgb(102, 121, 139).
Aa
Black text reads best on this color (4.67:1).
About this color
#66798B is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.036 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.011 away. Black text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.67:1 |
| White text | 4.49:1 |
Values
| HEX | #66798B |
| RGB | rgb(102, 121, 139) |
| HSL | hsl(209, 15%, 47%) |
| OKLCH | oklch(56.7% 0.036 247) |
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 #66798B | 4.49:1 | AA large text | Lc -76.7 | Fine for body text |
| Black text on #66798B | 4.67:1 | AA | Lc 32.9 | Non-text elements, placeholder text |
| #66798B text on white | 4.49:1 | AA large text | Lc 71.2 | Content text, not long reading |
| #66798B text on black | 4.67:1 | AA | Lc -30.5 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D5DADF
oklch(88.6% 0.009 247.9)
-
Step 300
300
#B9C2CB
oklch(81% 0.016 248)
-
Step 400
400
#94A2B0
oklch(70.6% 0.026 248.2)
-
Step 500
500
#7A8C9D
oklch(63.2% 0.033 246.8)
-
Step 600
600 (this color)
#66798B
oklch(56.7% 0.036 247)
-
Step 700
700
#526373
oklch(49.2% 0.033 246.9)
-
Step 800
800
#43515E
oklch(42.8% 0.028 246.5)
-
Step 900
900
#39434D
oklch(37.8% 0.022 248.4)
-
Step 950
950
#21272D
oklch(26.9% 0.014 248.4)
#66798B 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) | #72798C | 0.017 |
| Deuteranopia (no green cones) | #6E758B | 0.015 |
| Tritanopia (no blue cones) | #5C7D7F | 0.029 |
| Achromatopsia (no color) | #777777 | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66798B
#66798B
oklch(56.7% 0.036 247)
- #857360
#857360
oklch(56.7% 0.036 68.5)
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 #66798B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.011
- Battleship Grey #6B7C85 ΔE 0.016
- Battleship Gray #6C757D ΔE 0.022
- Slate Gray #708090 ΔE 0.026
- Steel Grey #6F828A ΔE 0.031
- Stormy Blue #507B9C ΔE 0.035
- Metallic Blue #4F738E ΔE 0.037
- Steel #738595 ΔE 0.041
Use #66798B 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.