#636E8A
Closest named color: Metallic Blue (#4F738E). oklch(54% 0.046 268.1), rgb(99, 110, 138).
Aa
White text reads best on this color (5.08:1).
About this color
#636E8A is a medium-dark, muted blue. In OKLCH its lightness is 54%, its chroma 0.046 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.027 away. White text reads best on it, at 5.08:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.12:1 |
| White text | 5.08:1 |
Values
| HEX | #636E8A |
| RGB | rgb(99, 110, 138) |
| HSL | hsl(223, 16%, 46%) |
| OKLCH | oklch(54% 0.046 268.1) |
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 #636E8A | 5.08:1 | AA | Lc -80.5 | Fine for body text |
| Black text on #636E8A | 4.12:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #636E8A text on white | 5.08:1 | AA | Lc 75.1 | Fine for body text |
| #636E8A text on black | 4.12:1 | AA large text | Lc -26.6 | 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
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D6D9E1
oklch(88.5% 0.011 269.5)
-
Step 300
300
#BBC0CE
oklch(80.8% 0.02 270.2)
-
Step 400
400
#98A0B6
oklch(70.7% 0.033 269.7)
-
Step 500
500
#7E89A4
oklch(63.1% 0.043 267.7)
-
Step 600
600 (this color)
#636E8A
oklch(54% 0.046 268.1)
-
Step 700
700
#56607A
oklch(49.1% 0.044 268.4)
-
Step 800
800
#474F63
oklch(42.8% 0.035 267.9)
-
Step 900
900
#3B4151
oklch(37.6% 0.029 268.9)
-
Step 950
950
#23262F
oklch(26.9% 0.017 270.7)
#636E8A 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) | #65708B | 0.007 |
| Deuteranopia (no green cones) | #626D89 | 0.003 |
| Tritanopia (no blue cones) | #597377 | 0.041 |
| Achromatopsia (no color) | #6E6E6E | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #636E8A
#636E8A
oklch(54% 0.046 268.1)
- #7A6D50
#7A6D50
oklch(53.9% 0.045 86.6)
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 #636E8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.027
- Battleship Gray #6C757D ΔE 0.036
- Dull Blue #49759C ΔE 0.040
- Stormy Blue #507B9C ΔE 0.043
- Grey Blue #647D8E ΔE 0.043
- Battleship Grey #6B7C85 ΔE 0.047
- Grey Purple #826D8C ΔE 0.048
- Cerulean #457B9D ΔE 0.049
Use #636E8A 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.