#63758F
Closest named color: Grey Blue (#647D8E). oklch(55.8% 0.046 257.5), rgb(99, 117, 143).
Aa
White text reads best on this color (4.69:1).
About this color
#63758F is a medium-dark, muted blue. In OKLCH its lightness is 56%, its chroma 0.046 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.024 away. White text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.47:1 |
| White text | 4.69:1 |
Values
| HEX | #63758F |
| RGB | rgb(99, 117, 143) |
| HSL | hsl(215, 18%, 47%) |
| OKLCH | oklch(55.8% 0.046 257.5) |
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 #63758F | 4.69:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #63758F | 4.47:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #63758F text on white | 4.69:1 | AA | Lc 72.6 | Content text, not long reading |
| #63758F text on black | 4.47:1 | AA large text | Lc -29.1 | Dividers and decoration only |
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
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4D9E1
oklch(88.4% 0.012 259.8)
-
Step 300
300
#B8C1CE
oklch(80.8% 0.021 257.5)
-
Step 400
400
#94A2B6
oklch(70.8% 0.033 257.3)
-
Step 500
500
#7A8BA3
oklch(63.2% 0.041 257)
-
Step 600
600 (this color)
#63758F
oklch(55.8% 0.046 257.5)
-
Step 700
700
#526279
oklch(49.2% 0.042 257.4)
-
Step 800
800
#435063
oklch(42.8% 0.036 257.8)
-
Step 900
900
#384250
oklch(37.6% 0.027 256.8)
-
Step 950
950
#21272F
oklch(27% 0.017 255.7)
#63758F 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) | #6C7690 | 0.013 |
| Deuteranopia (no green cones) | #67728E | 0.009 |
| Tritanopia (no blue cones) | #567B7E | 0.041 |
| Achromatopsia (no color) | #747474 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63758F
#63758F
oklch(55.8% 0.046 257.5)
- #837155
#837155
oklch(55.8% 0.047 78.5)
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 #63758F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.024
- Metallic Blue #4F738E ΔE 0.027
- Stormy Blue #507B9C ΔE 0.029
- Battleship Gray #6C757D ΔE 0.030
- Battleship Grey #6B7C85 ΔE 0.032
- Dull Blue #49759C ΔE 0.036
- Cerulean #457B9D ΔE 0.038
- Slate Gray #708090 ΔE 0.038
Use #63758F 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.