#637489
Closest named color: Battleship Gray (#6C757D). oklch(55.3% 0.039 253.9), rgb(99, 116, 137).
Aa
White text reads best on this color (4.78:1).
About this color
#637489 is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.039 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Battleship Gray (#6C757D), ΔE 0.023 away. White text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.38:1 |
| White text | 4.78:1 |
Values
| HEX | #637489 |
| RGB | rgb(99, 116, 137) |
| HSL | hsl(213, 16%, 46%) |
| OKLCH | oklch(55.3% 0.039 253.9) |
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 #637489 | 4.78:1 | AA | Lc -78.6 | Fine for body text |
| Black text on #637489 | 4.38:1 | AA large text | Lc 30.9 | Non-text elements, placeholder text |
| #637489 text on white | 4.78:1 | AA | Lc 73.2 | Content text, not long reading |
| #637489 text on black | 4.38:1 | AA large text | Lc -28.5 | 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
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D5DADF
oklch(88.6% 0.009 247.9)
-
Step 300
300
#B9C1CC
oklch(80.8% 0.018 256.3)
-
Step 400
400
#95A2B2
oklch(70.7% 0.028 253.6)
-
Step 500
500
#7B8B9F
oklch(63.1% 0.035 254.1)
-
Step 600
600 (this color)
#637489
oklch(55.3% 0.039 253.9)
-
Step 700
700
#536275
oklch(49.1% 0.036 254.5)
-
Step 800
800
#44505F
oklch(42.7% 0.029 254.1)
-
Step 900
900
#39424E
oklch(37.6% 0.024 255.7)
-
Step 950
950
#22272E
oklch(27.1% 0.015 256.8)
#637489 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) | #6D758A | 0.015 |
| Deuteranopia (no green cones) | #687189 | 0.011 |
| Tritanopia (no blue cones) | #58797B | 0.034 |
| Achromatopsia (no color) | #727272 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637489
#637489
oklch(55.3% 0.039 253.9)
- #806F5A
#806F5A
oklch(55.2% 0.038 72.8)
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 #637489, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.023
- Grey Blue #647D8E ΔE 0.026
- Metallic Blue #4F738E ΔE 0.027
- Battleship Grey #6B7C85 ΔE 0.030
- Stormy Blue #507B9C ΔE 0.035
- Slate Gray #708090 ΔE 0.041
- Dull Blue #49759C ΔE 0.041
- Cerulean #457B9D ΔE 0.043
Use #637489 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.