#64818B
Closest named color: Grey Blue (#647D8E). oklch(58.4% 0.036 221), rgb(100, 129, 139).
Aa
Black text reads best on this color (5.05:1).
About this color
#64818B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 58%, its chroma 0.036 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.014 away. Black text reads best on it, at 5.05:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #64818B |
| RGB | rgb(100, 129, 139) |
| HSL | hsl(195, 16%, 47%) |
| OKLCH | oklch(58.4% 0.036 221) |
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 #64818B | 4.15:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #64818B | 5.05:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #64818B text on white | 4.15:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #64818B text on black | 5.05:1 | AA | Lc -33.1 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EBEC
oklch(93.7% 0.005 214.3)
-
Step 200
200
#D3DBDD
oklch(88.6% 0.009 214.3)
-
Step 300
300
#B6C3C8
oklch(80.9% 0.016 222.7)
-
Step 400
400
#8FA5AC
oklch(70.7% 0.027 218.9)
-
Step 500
500
#748F98
oklch(63.2% 0.033 220.1)
-
Step 600
600 (this color)
#64818B
oklch(58.4% 0.036 221)
-
Step 700
700
#4B656E
oklch(48.9% 0.034 221.2)
-
Step 800
800
#3E535A
oklch(42.8% 0.028 220.3)
-
Step 900
900
#35444A
oklch(37.6% 0.022 224.2)
-
Step 950
950
#1F282B
oklch(26.9% 0.014 220.1)
#64818B 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) | #7B7F8C | 0.031 |
| Deuteranopia (no green cones) | #757A8B | 0.029 |
| Tritanopia (no blue cones) | #588484 | 0.022 |
| Achromatopsia (no color) | #7C7C7C | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #64818B
#64818B
oklch(58.4% 0.036 221)
- #8F756B
#8F756B
oklch(58.4% 0.036 42.1)
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 #64818B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.014
- Steel Grey #6F828A ΔE 0.015
- Battleship Grey #6B7C85 ΔE 0.016
- Slate Gray #708090 ΔE 0.019
- Steel #738595 ΔE 0.028
- Battleship Gray #6C757D ΔE 0.035
- Medium Grey #7D7F7C ΔE 0.038
- Light Slate Gray #778899 ΔE 0.038
Use #64818B 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.