#637686
Closest named color: Battleship Gray (#6C757D). oklch(55.6% 0.034 243.8), rgb(99, 118, 134).
Aa
White text reads best on this color (4.70:1).
About this color
#637686 is a medium-dark, muted blue. In OKLCH its lightness is 56%, its chroma 0.034 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Battleship Gray (#6C757D), ΔE 0.017 away. White text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.46:1 |
| White text | 4.70:1 |
Values
| HEX | #637686 |
| RGB | rgb(99, 118, 134) |
| HSL | hsl(207, 15%, 46%) |
| OKLCH | oklch(55.6% 0.034 243.8) |
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 #637686 | 4.70:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #637686 | 4.46:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #637686 text on white | 4.70:1 | AA | Lc 72.7 | Content text, not long reading |
| #637686 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D5DADE
oklch(88.6% 0.008 241.7)
-
Step 300
300
#B9C2CA
oklch(80.9% 0.015 244.8)
-
Step 400
400
#94A3AF
oklch(70.8% 0.024 242)
-
Step 500
500
#7A8C9B
oklch(63.1% 0.031 243.4)
-
Step 600
600 (this color)
#637686
oklch(55.6% 0.034 243.8)
-
Step 700
700
#526371
oklch(49.1% 0.031 243.2)
-
Step 800
800
#43515C
oklch(42.7% 0.025 241.9)
-
Step 900
900
#39434C
oklch(37.7% 0.02 245.5)
-
Step 950
950
#21272C
oklch(26.9% 0.013 243.3)
#637686 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) | #707687 | 0.018 |
| Deuteranopia (no green cones) | #6B7286 | 0.015 |
| Tritanopia (no blue cones) | #597A7B | 0.028 |
| Achromatopsia (no color) | #747474 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637686
#637686
oklch(55.6% 0.034 243.8)
- #82705F
#82705F
oklch(55.7% 0.034 65.4)
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 #637686, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.017
- Grey Blue #647D8E ΔE 0.021
- Battleship Grey #6B7C85 ΔE 0.022
- Metallic Blue #4F738E ΔE 0.031
- Slate Gray #708090 ΔE 0.036
- Stormy Blue #507B9C ΔE 0.038
- Steel Grey #6F828A ΔE 0.040
- Cerulean #457B9D ΔE 0.045
Use #637686 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.