#647B88
Closest named color: Grey Blue (#647D8E). oklch(56.9% 0.034 232.9), rgb(100, 123, 136).
Aa
Black text reads best on this color (4.73:1).
About this color
#647B88 is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.034 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.009 away. Black text reads best on it, at 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.73:1 |
| White text | 4.43:1 |
Values
| HEX | #647B88 |
| RGB | rgb(100, 123, 136) |
| HSL | hsl(202, 15%, 46%) |
| OKLCH | oklch(56.9% 0.034 232.9) |
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 #647B88 | 4.43:1 | AA large text | Lc -76.3 | Fine for body text |
| Black text on #647B88 | 4.73:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #647B88 text on white | 4.43:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #647B88 text on black | 4.73:1 | AA | Lc -30.9 | 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
#D4DADE
oklch(88.5% 0.009 236.6)
-
Step 300
300
#B8C2C9
oklch(80.8% 0.015 238.1)
-
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)
#647B88
oklch(56.9% 0.034 232.9)
-
Step 700
700
#4F6470
oklch(49.1% 0.032 233.3)
-
Step 800
800
#41525B
oklch(42.8% 0.026 231.2)
-
Step 900
900
#37444B
oklch(37.8% 0.021 231.5)
-
Step 950
950
#20282C
oklch(27.1% 0.014 229.5)
#647B88 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) | #757A89 | 0.024 |
| Deuteranopia (no green cones) | #707688 | 0.021 |
| Tritanopia (no blue cones) | #597F7F | 0.026 |
| Achromatopsia (no color) | #787878 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647B88
#647B88
oklch(56.9% 0.034 232.9)
- #887265
#887265
oklch(56.9% 0.034 52.4)
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 #647B88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.009
- Battleship Grey #6B7C85 ΔE 0.011
- Battleship Gray #6C757D ΔE 0.021
- Slate Gray #708090 ΔE 0.025
- Steel Grey #6F828A ΔE 0.026
- Stormy Blue #507B9C ΔE 0.038
- Steel #738595 ΔE 0.039
- Metallic Blue #4F738E ΔE 0.040
Use #647B88 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.