#637183
Closest named color: Battleship Gray (#6C757D). oklch(54.4% 0.033 254.8), rgb(99, 113, 131).
Aa
White text reads best on this color (4.97:1).
About this color
#637183 is a medium-dark, muted blue. In OKLCH its lightness is 54%, its chroma 0.033 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Battleship Gray (#6C757D), ΔE 0.022 away. White text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.22:1 |
| White text | 4.97:1 |
Values
| HEX | #637183 |
| RGB | rgb(99, 113, 131) |
| HSL | hsl(214, 14%, 45%) |
| OKLCH | oklch(54.4% 0.033 254.8) |
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 #637183 | 4.97:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #637183 | 4.22:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #637183 text on white | 4.97:1 | AA | Lc 74.4 | Content text, not long reading |
| #637183 text on black | 4.22:1 | AA large text | Lc -27.3 | 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
#D5D9DF
oklch(88.4% 0.009 258.3)
-
Step 300
300
#BAC1CA
oklch(80.8% 0.015 254.6)
-
Step 400
400
#97A2B0
oklch(70.8% 0.024 254.4)
-
Step 500
500
#7D8B9C
oklch(63.1% 0.03 253.3)
-
Step 600
600 (this color)
#637183
oklch(54.4% 0.033 254.8)
-
Step 700
700
#556272
oklch(49.1% 0.03 253.7)
-
Step 800
800
#46505D
oklch(42.7% 0.025 255.1)
-
Step 900
900
#3B424C
oklch(37.7% 0.02 257.3)
-
Step 950
950
#22272D
oklch(27% 0.013 253)
#637183 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) | #6B7184 | 0.012 |
| Deuteranopia (no green cones) | #676E83 | 0.010 |
| Tritanopia (no blue cones) | #5A7577 | 0.029 |
| Achromatopsia (no color) | #707070 | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637183
#637183
oklch(54.4% 0.033 254.8)
- #7B6D5B
#7B6D5B
oklch(54.3% 0.032 74)
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 #637183, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.022
- Metallic Blue #4F738E ΔE 0.028
- Grey Blue #647D8E ΔE 0.035
- Battleship Grey #6B7C85 ΔE 0.035
- Dim Gray #696969 ΔE 0.040
- Stormy Blue #507B9C ΔE 0.044
- Dull Blue #49759C ΔE 0.046
- Slate Gray #708090 ΔE 0.049
Use #637183 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.