#638CA0
Closest named color: Blue Grey (#758DA3). oklch(61.7% 0.054 229.8), rgb(99, 140, 160).
Aa
Black text reads best on this color (5.78:1).
About this color
#638CA0 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 62%, its chroma 0.054 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Grey (#758DA3), ΔE 0.023 away. Black text reads best on it, at 5.78:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (62%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Blue Grey (#758DA3) |
| Black text | 5.78:1 |
| White text | 3.62:1 |
Values
| HEX | #638CA0 |
| RGB | rgb(99, 140, 160) |
| HSL | hsl(200, 24%, 51%) |
| OKLCH | oklch(61.7% 0.054 229.8) |
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 #638CA0 | 3.62:1 | AA large text | Lc -69.3 | Content text, not long reading |
| Black text on #638CA0 | 5.78:1 | AA | Lc 40.3 | Non-text elements, placeholder text |
| #638CA0 text on white | 3.62:1 | AA large text | Lc 63.8 | Content text, not long reading |
| #638CA0 text on black | 5.78:1 | AA | Lc -37.9 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D0DBE1
oklch(88.5% 0.015 231.2)
-
Step 300
300
#B0C4CF
oklch(80.9% 0.027 231.7)
-
Step 400
400
#86A6B6
oklch(70.7% 0.042 229.7)
-
Step 500
500 (this color)
#638CA0
oklch(61.7% 0.054 229.8)
-
Step 600
600
#4E7A8F
oklch(55.6% 0.058 229.7)
-
Step 700
700
#3E677A
oklch(49.1% 0.055 229.2)
-
Step 800
800
#345463
oklch(42.7% 0.045 229.3)
-
Step 900
900
#2D4551
oklch(37.6% 0.036 230.6)
-
Step 950
950
#1B292F
oklch(27.1% 0.022 226.4)
#638CA0 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) | #828AA1 | 0.040 |
| Deuteranopia (no green cones) | #7983A0 | 0.036 |
| Tritanopia (no blue cones) | #4D9292 | 0.040 |
| Achromatopsia (no color) | #868686 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638CA0
#638CA0
oklch(61.7% 0.054 229.8)
- #A17C68
#A17C68
oklch(61.7% 0.055 49.7)
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 #638CA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Grey #758DA3 ΔE 0.023
- Light Slate Gray #778899 ΔE 0.026
- Steel #738595 ΔE 0.027
- Silver Lake Blue #778DA9 ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.032
- Slate Gray #708090 ΔE 0.037
- Steel Grey #6F828A ΔE 0.037
- Off Blue #5684AE ΔE 0.040
Use #638CA0 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.