#637396
Closest named color: Stormy Blue (#507B9C). oklch(55.6% 0.058 265.5), rgb(99, 115, 150).
Aa
White text reads best on this color (4.74:1).
About this color
#637396 is a medium-dark, muted blue. In OKLCH its lightness is 56%, its chroma 0.058 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.029 away. White text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #637396 |
| RGB | rgb(99, 115, 150) |
| HSL | hsl(221, 20%, 49%) |
| OKLCH | oklch(55.6% 0.058 265.5) |
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 #637396 | 4.74:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #637396 | 4.42:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #637396 text on white | 4.74:1 | AA | Lc 72.9 | Content text, not long reading |
| #637396 text on black | 4.42:1 | AA large text | Lc -28.7 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D4D9E3
oklch(88.4% 0.015 264.5)
-
Step 300
300
#B8C1D2
oklch(80.9% 0.026 263.3)
-
Step 400
400
#94A1BB
oklch(70.8% 0.041 264.3)
-
Step 500
500
#7A89AB
oklch(63.1% 0.054 266.2)
-
Step 600
600 (this color)
#637396
oklch(55.6% 0.058 265.5)
-
Step 700
700
#526080
oklch(49% 0.054 266.1)
-
Step 800
800
#434F68
oklch(42.8% 0.044 264.6)
-
Step 900
900
#394154
oklch(37.6% 0.034 266.9)
-
Step 950
950
#212631
oklch(26.9% 0.022 265.8)
#637396 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) | #677598 | 0.009 |
| Deuteranopia (no green cones) | #637195 | 0.006 |
| Tritanopia (no blue cones) | #547A7F | 0.052 |
| Achromatopsia (no color) | #737373 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637396
#637396
oklch(55.6% 0.058 265.5)
- #83714B
#83714B
oklch(55.6% 0.058 85.2)
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 #637396, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.029
- Metallic Blue #4F738E ΔE 0.030
- Dull Blue #49759C ΔE 0.031
- Grey Blue #647D8E ΔE 0.036
- Cerulean #457B9D ΔE 0.038
- Battleship Gray #6C757D ΔE 0.043
- Battleship Grey #6B7C85 ΔE 0.045
- Slate Gray #708090 ΔE 0.047
Use #637396 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.