#638C8D
Closest named color: Steel Grey (#6F828A). oklch(61% 0.045 197.9), rgb(99, 140, 141).
Aa
Black text reads best on this color (5.66:1).
About this color
#638C8D is a medium-dark, muted teal or cyan. In OKLCH its lightness is 61%, its chroma 0.045 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Grey (#6F828A), ΔE 0.030 away. Black text reads best on it, at 5.66:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (61%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Steel Grey (#6F828A) |
| Black text | 5.66:1 |
| White text | 3.70:1 |
Values
| HEX | #638C8D |
| RGB | rgb(99, 140, 141) |
| HSL | hsl(181, 18%, 47%) |
| OKLCH | oklch(61% 0.045 197.9) |
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 #638C8D | 3.70:1 | AA large text | Lc -70.1 | Content text, not long reading |
| Black text on #638C8D | 5.66:1 | AA | Lc 39.5 | Non-text elements, placeholder text |
| #638C8D text on white | 3.70:1 | AA large text | Lc 64.6 | Content text, not long reading |
| #638C8D text on black | 5.66:1 | AA | Lc -37.1 | 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 500.
-
Step 50
50
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEB
oklch(93.6% 0.006 197)
-
Step 200
200
#D0DCDC
oklch(88.5% 0.013 196.9)
-
Step 300
300
#B1C5C6
oklch(80.9% 0.022 200.4)
-
Step 400
400
#88A8A8
oklch(70.8% 0.035 196.4)
-
Step 500
500 (this color)
#638C8D
oklch(61% 0.045 197.9)
-
Step 600
600
#507C7E
oklch(55.5% 0.049 199.5)
-
Step 700
700
#40696A
oklch(49.1% 0.046 197.7)
-
Step 800
800
#355656
oklch(42.8% 0.039 195.8)
-
Step 900
900
#2F4747
oklch(37.8% 0.03 196)
-
Step 950
950
#1C292A
oklch(26.9% 0.018 202.1)
#638C8D 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) | #87888D | 0.048 |
| Deuteranopia (no green cones) | #7F828D | 0.044 |
| Tritanopia (no blue cones) | #548F8C | 0.018 |
| Achromatopsia (no color) | #858585 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638C8D
#638C8D
oklch(61% 0.045 197.9)
- #9D7979
#9D7979
oklch(61.1% 0.045 18.5)
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 #638C8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Grey #6F828A ΔE 0.030
- Dusty Teal #4C9085 ΔE 0.031
- Steel #738595 ΔE 0.033
- Light Slate Gray #778899 ΔE 0.036
- Slate Gray #708090 ΔE 0.039
- Blue Grey #758DA3 ΔE 0.042
- Battleship Grey #6B7C85 ΔE 0.045
- Grey Blue #647D8E ΔE 0.045
Use #638C8D 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.