#63758E
Closest named color: Grey Blue (#647D8E). oklch(55.7% 0.045 256.6), rgb(99, 117, 142).
Aa
White text reads best on this color (4.70:1).
About this color
#63758E is a medium-dark, muted blue. In OKLCH its lightness is 56%, its chroma 0.045 and its hue 257°. 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 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.46:1 |
| White text | 4.70:1 |
Values
| HEX | #63758E |
| RGB | rgb(99, 117, 142) |
| HSL | hsl(215, 18%, 47%) |
| OKLCH | oklch(55.7% 0.045 256.6) |
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 #63758E | 4.70:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #63758E | 4.46:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #63758E text on white | 4.70:1 | AA | Lc 72.7 | Content text, not long reading |
| #63758E text on black | 4.46:1 | AA large text | Lc -29.0 | 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
#94A2B5
oklch(70.7% 0.032 256)
-
Step 500
500
#7A8BA3
oklch(63.2% 0.041 257)
-
Step 600
600 (this color)
#63758E
oklch(55.7% 0.045 256.6)
-
Step 700
700
#526278
oklch(49.1% 0.041 256.4)
-
Step 800
800
#435062
oklch(42.7% 0.034 256.6)
-
Step 900
900
#394250
oklch(37.7% 0.027 259.2)
-
Step 950
950
#21272F
oklch(27% 0.017 255.7)
#63758E 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) | #6C768F | 0.013 |
| Deuteranopia (no green cones) | #68728D | 0.010 |
| Tritanopia (no blue cones) | #577A7D | 0.039 |
| Achromatopsia (no color) | #747474 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63758E
#63758E
oklch(55.7% 0.045 256.6)
- #837156
#837156
oklch(55.8% 0.045 77.7)
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 #63758E, 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
- Battleship Gray #6C757D ΔE 0.029
- Stormy Blue #507B9C ΔE 0.030
- Battleship Grey #6B7C85 ΔE 0.031
- Dull Blue #49759C ΔE 0.037
- Slate Gray #708090 ΔE 0.038
- Cerulean #457B9D ΔE 0.039
Use #63758E 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.