#647E81
Closest named color: Battleship Grey (#6B7C85). oklch(57.4% 0.03 205), rgb(100, 126, 129).
Aa
Black text reads best on this color (4.84:1).
About this color
#647E81 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 57%, its chroma 0.030 and its hue 205°. Its hue sits on the cool side of the wheel. The nearest named color is Battleship Grey (#6B7C85), ΔE 0.014 away. Black text reads best on it, at 4.84:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Battleship Grey (#6B7C85) |
| Black text | 4.84:1 |
| White text | 4.33:1 |
Values
| HEX | #647E81 |
| RGB | rgb(100, 126, 129) |
| HSL | hsl(186, 13%, 45%) |
| OKLCH | oklch(57.4% 0.03 205) |
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 #647E81 | 4.33:1 | AA large text | Lc -75.5 | Fine for body text |
| Black text on #647E81 | 4.84:1 | AA | Lc 34.1 | Non-text elements, placeholder text |
| #647E81 text on white | 4.33:1 | AA large text | Lc 70.0 | Content text, not long reading |
| #647E81 text on black | 4.84:1 | AA | Lc -31.6 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EBEB
oklch(93.7% 0.004 197.1)
-
Step 200
200
#D4DBDB
oklch(88.6% 0.008 197)
-
Step 300
300
#B7C3C5
oklch(80.9% 0.014 208.8)
-
Step 400
400
#92A5A7
oklch(70.8% 0.022 204.4)
-
Step 500
500
#768F91
oklch(63.1% 0.029 202.4)
-
Step 600
600 (this color)
#647E81
oklch(57.4% 0.03 205)
-
Step 700
700
#4E6668
oklch(49.2% 0.029 202.6)
-
Step 800
800
#405355
oklch(42.7% 0.024 204.3)
-
Step 900
900
#374546
oklch(37.9% 0.018 201.8)
-
Step 950
950
#202829
oklch(27% 0.011 205.8)
#647E81 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) | #7A7C81 | 0.030 |
| Deuteranopia (no green cones) | #757881 | 0.028 |
| Tritanopia (no blue cones) | #5B807F | 0.013 |
| Achromatopsia (no color) | #797979 | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647E81
#647E81
oklch(57.4% 0.03 205)
- #8A726F
#8A726F
oklch(57.4% 0.031 26.4)
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 #647E81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Grey #6B7C85 ΔE 0.014
- Grey Blue #647D8E ΔE 0.022
- Steel Grey #6F828A ΔE 0.023
- Battleship Gray #6C757D ΔE 0.026
- Slate Gray #708090 ΔE 0.029
- Medium Grey #7D7F7C ΔE 0.035
- Gray #808080 ΔE 0.040
- Steel #738595 ΔE 0.040
Use #647E81 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.