#647B87
Closest named color: Battleship Grey (#6B7C85). oklch(56.9% 0.033 230.8), rgb(100, 123, 135).
Aa
Black text reads best on this color (4.72:1).
About this color
#647B87 is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.033 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Battleship Grey (#6B7C85), ΔE 0.011 away. Black text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Battleship Grey (#6B7C85) |
| Black text | 4.72:1 |
| White text | 4.44:1 |
Values
| HEX | #647B87 |
| RGB | rgb(100, 123, 135) |
| HSL | hsl(201, 15%, 46%) |
| OKLCH | oklch(56.9% 0.033 230.8) |
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 #647B87 | 4.44:1 | AA large text | Lc -76.3 | Fine for body text |
| Black text on #647B87 | 4.72:1 | AA | Lc 33.2 | Non-text elements, placeholder text |
| #647B87 text on white | 4.44:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #647B87 text on black | 4.72:1 | AA | Lc -30.8 | 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
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADD
oklch(88.5% 0.008 228.9)
-
Step 300
300
#B8C3C8
oklch(81% 0.014 226.6)
-
Step 400
400
#92A4AD
oklch(70.8% 0.024 229.2)
-
Step 500
500
#788D99
oklch(63.1% 0.03 233)
-
Step 600
600 (this color)
#647B87
oklch(56.9% 0.033 230.8)
-
Step 700
700
#4F646F
oklch(49% 0.031 231)
-
Step 800
800
#41525A
oklch(42.7% 0.025 228.1)
-
Step 900
900
#37444A
oklch(37.7% 0.02 227.5)
-
Step 950
950
#20282B
oklch(27% 0.013 222.5)
#647B87 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) | #757A88 | 0.024 |
| Deuteranopia (no green cones) | #707687 | 0.021 |
| Tritanopia (no blue cones) | #5A7E7F | 0.022 |
| Achromatopsia (no color) | #787878 | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647B87
#647B87
oklch(56.9% 0.033 230.8)
- #877266
#877266
oklch(56.8% 0.032 51.5)
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 #647B87, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Grey #6B7C85 ΔE 0.011
- Grey Blue #647D8E ΔE 0.011
- Battleship Gray #6C757D ΔE 0.021
- Slate Gray #708090 ΔE 0.026
- Steel Grey #6F828A ΔE 0.026
- Stormy Blue #507B9C ΔE 0.039
- Steel #738595 ΔE 0.040
- Metallic Blue #4F738E ΔE 0.041
Use #647B87 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.