#636D83
Closest named color: Metallic Blue (#4F738E). oklch(53.4% 0.037 265.9), rgb(99, 109, 131).
Aa
White text reads best on this color (5.19:1).
About this color
#636D83 is a medium-dark, muted blue. In OKLCH its lightness is 53%, its chroma 0.037 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.030 away. White text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.04:1 |
| White text | 5.19:1 |
Values
| HEX | #636D83 |
| RGB | rgb(99, 109, 131) |
| HSL | hsl(221, 14%, 45%) |
| OKLCH | oklch(53.4% 0.037 265.9) |
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 #636D83 | 5.19:1 | AA | Lc -81.1 | Fine for body text |
| Black text on #636D83 | 4.04:1 | AA large text | Lc 28.3 | Dividers and decoration only |
| #636D83 text on white | 5.19:1 | AA | Lc 75.7 | Fine for body text |
| #636D83 text on black | 4.04:1 | AA large text | Lc -26.0 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D6D9DF
oklch(88.5% 0.009 264.5)
-
Step 300
300
#BBC1CC
oklch(81% 0.017 262.7)
-
Step 400
400
#99A1B2
oklch(70.8% 0.026 265.5)
-
Step 500
500
#80899F
oklch(63% 0.035 267.8)
-
Step 600
600 (this color)
#636D83
oklch(53.4% 0.037 265.9)
-
Step 700
700
#586175
oklch(49.2% 0.034 266.1)
-
Step 800
800
#484F5F
oklch(42.8% 0.028 266.6)
-
Step 900
900
#3C424E
oklch(37.8% 0.022 264.3)
-
Step 950
950
#23262D
oklch(26.9% 0.014 267)
#636D83 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) | #666E84 | 0.006 |
| Deuteranopia (no green cones) | #636C82 | 0.003 |
| Tritanopia (no blue cones) | #5B7174 | 0.033 |
| Achromatopsia (no color) | #6D6D6D | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #636D83
#636D83
oklch(53.4% 0.037 265.9)
- #776C55
#776C55
oklch(53.5% 0.037 85.4)
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 #636D83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.030
- Battleship Gray #6C757D ΔE 0.032
- Dim Gray #696969 ΔE 0.039
- Slate #516572 ΔE 0.043
- Grey Blue #647D8E ΔE 0.046
- Battleship Grey #6B7C85 ΔE 0.047
- Dull Blue #49759C ΔE 0.047
- Stormy Blue #507B9C ΔE 0.050
Use #636D83 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.