#637993
Closest named color: Grey Blue (#647D8E). oklch(56.8% 0.048 252.9), rgb(99, 121, 147).
Aa
Black text reads best on this color (4.68:1).
About this color
#637993 is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.048 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.016 away. Black text reads best on it, at 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #637993 |
| RGB | rgb(99, 121, 147) |
| HSL | hsl(213, 20%, 48%) |
| OKLCH | oklch(56.8% 0.048 252.9) |
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 #637993 | 4.48:1 | AA large text | Lc -76.6 | Fine for body text |
| Black text on #637993 | 4.68:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #637993 text on white | 4.48:1 | AA large text | Lc 71.1 | Content text, not long reading |
| #637993 text on black | 4.68:1 | AA | Lc -30.6 | Non-text elements, placeholder text |
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
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4DAE1
oklch(88.6% 0.012 252.1)
-
Step 300
300
#B7C2CF
oklch(81% 0.022 252.5)
-
Step 400
400
#92A2B6
oklch(70.6% 0.034 254.1)
-
Step 500
500
#778CA4
oklch(63.2% 0.044 251.9)
-
Step 600
600 (this color)
#637993
oklch(56.8% 0.048 252.9)
-
Step 700
700
#4F637A
oklch(49.2% 0.044 252.2)
-
Step 800
800
#415063
oklch(42.6% 0.037 254.5)
-
Step 900
900
#374351
oklch(37.8% 0.029 252.5)
-
Step 950
950
#20272F
oklch(26.9% 0.018 251.9)
#637993 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) | #6F7A94 | 0.017 |
| Deuteranopia (no green cones) | #6A7592 | 0.014 |
| Tritanopia (no blue cones) | #557F82 | 0.041 |
| Achromatopsia (no color) | #777777 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637993
#637993
oklch(56.8% 0.048 252.9)
- #897358
#897358
oklch(56.9% 0.048 72.3)
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 #637993, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.016
- Stormy Blue #507B9C ΔE 0.025
- Battleship Grey #6B7C85 ΔE 0.028
- Slate Gray #708090 ΔE 0.030
- Metallic Blue #4F738E ΔE 0.033
- Battleship Gray #6C757D ΔE 0.034
- Cerulean #457B9D ΔE 0.035
- Dull Blue #49759C ΔE 0.038
Use #637993 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.