#637384
Closest named color: Battleship Gray (#6C757D). oklch(54.9% 0.033 250), rgb(99, 115, 132).
Aa
White text reads best on this color (4.86:1).
About this color
#637384 is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.033 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Battleship Gray (#6C757D), ΔE 0.019 away. White text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.31:1 |
| White text | 4.86:1 |
Values
| HEX | #637384 |
| RGB | rgb(99, 115, 132) |
| HSL | hsl(211, 14%, 45%) |
| OKLCH | oklch(54.9% 0.033 250) |
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 #637384 | 4.86:1 | AA | Lc -79.2 | Fine for body text |
| Black text on #637384 | 4.31:1 | AA large text | Lc 30.3 | Non-text elements, placeholder text |
| #637384 text on white | 4.86:1 | AA | Lc 73.7 | Content text, not long reading |
| #637384 text on black | 4.31:1 | AA large text | Lc -28.0 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5DADE
oklch(88.6% 0.008 241.7)
-
Step 300
300
#BAC2CA
oklch(81% 0.014 248)
-
Step 400
400
#96A2AF
oklch(70.7% 0.023 250.3)
-
Step 500
500
#7C8B9B
oklch(63% 0.03 250)
-
Step 600
600 (this color)
#637384
oklch(54.9% 0.033 250)
-
Step 700
700
#546272
oklch(49% 0.031 251.9)
-
Step 800
800
#45505D
oklch(42.7% 0.026 252.7)
-
Step 900
900
#3A434C
oklch(37.8% 0.019 248.3)
-
Step 950
950
#22272C
oklch(27% 0.012 248.3)
#637384 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) | #6D7385 | 0.014 |
| Deuteranopia (no green cones) | #697084 | 0.012 |
| Tritanopia (no blue cones) | #5A7778 | 0.029 |
| Achromatopsia (no color) | #717171 | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637384
#637384
oklch(54.9% 0.033 250)
- #7E6E5D
#7E6E5D
oklch(54.8% 0.032 68.8)
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 #637384, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.019
- Metallic Blue #4F738E ΔE 0.029
- Grey Blue #647D8E ΔE 0.029
- Battleship Grey #6B7C85 ΔE 0.030
- Stormy Blue #507B9C ΔE 0.041
- Dim Gray #696969 ΔE 0.043
- Slate Gray #708090 ΔE 0.044
- Dull Blue #49759C ΔE 0.046
Use #637384 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.