#63809D
Closest named color: Grey Blue (#647D8E). oklch(58.9% 0.056 248.8), rgb(99, 128, 157).
Aa
Black text reads best on this color (5.10:1).
About this color
#63809D is a medium-dark, muted blue. In OKLCH its lightness is 59%, its chroma 0.056 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.022 away. Black text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 5.10:1 |
| White text | 4.11:1 |
Values
| HEX | #63809D |
| RGB | rgb(99, 128, 157) |
| HSL | hsl(210, 23%, 50%) |
| OKLCH | oklch(58.9% 0.056 248.8) |
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 #63809D | 4.11:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #63809D | 5.10:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #63809D text on white | 4.11:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #63809D text on black | 5.10:1 | AA | Lc -33.4 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D2DAE2
oklch(88.5% 0.014 248)
-
Step 300
300
#B5C2D1
oklch(80.9% 0.026 251.9)
-
Step 400
400
#8EA3B9
oklch(70.7% 0.04 249.6)
-
Step 500
500
#728DA8
oklch(63.2% 0.051 248.6)
-
Step 600
600 (this color)
#63809D
oklch(58.9% 0.056 248.8)
-
Step 700
700
#49637D
oklch(49% 0.052 248.9)
-
Step 800
800
#3C5166
oklch(42.6% 0.044 248.9)
-
Step 900
900
#344353
oklch(37.7% 0.034 250.4)
-
Step 950
950
#1E2731
oklch(26.9% 0.023 251.3)
#63809D 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) | #75809E | 0.024 |
| Deuteranopia (no green cones) | #6E7A9C | 0.021 |
| Tritanopia (no blue cones) | #50878A | 0.047 |
| Achromatopsia (no color) | #7D7D7D | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63809D
#63809D
oklch(58.9% 0.056 248.8)
- #937759
#937759
oklch(58.8% 0.055 68.4)
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 #63809D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.022
- Slate Gray #708090 ΔE 0.025
- Dusty Blue #5A86AD ΔE 0.026
- Off Blue #5684AE ΔE 0.028
- Stormy Blue #507B9C ΔE 0.028
- Steel #738595 ΔE 0.031
- Steel Grey #6F828A ΔE 0.035
- Battleship Grey #6B7C85 ΔE 0.036
Use #63809D 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.