#638F97
Closest named color: Light Slate Gray (#778899). oklch(62.1% 0.049 210.1), rgb(99, 143, 151).
Aa
Black text reads best on this color (5.90:1).
About this color
#638F97 is a medium-light, muted teal or cyan. In OKLCH its lightness is 62%, its chroma 0.049 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Light Slate Gray (#778899), ΔE 0.031 away. Black text reads best on it, at 5.90:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (62%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Light Slate Gray (#778899) |
| Black text | 5.90:1 |
| White text | 3.55:1 |
Values
| HEX | #638F97 |
| RGB | rgb(99, 143, 151) |
| HSL | hsl(189, 21%, 49%) |
| OKLCH | oklch(62.1% 0.049 210.1) |
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 #638F97 | 3.55:1 | AA large text | Lc -68.6 | Content text, not long reading |
| Black text on #638F97 | 5.90:1 | AA | Lc 41.0 | Non-text elements, placeholder text |
| #638F97 text on white | 3.55:1 | AA large text | Lc 63.1 | Content text, not long reading |
| #638F97 text on black | 5.90:1 | AA | Lc -38.6 | 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 500.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D0DCDE
oklch(88.6% 0.013 208.8)
-
Step 300
300
#B0C5C9
oklch(80.9% 0.024 210.4)
-
Step 400
400
#85A8AE
oklch(70.8% 0.039 209.1)
-
Step 500
500 (this color)
#638F97
oklch(62.1% 0.049 210.1)
-
Step 600
600
#4C7C85
oklch(55.6% 0.054 210.7)
-
Step 700
700
#3D6970
oklch(49.2% 0.05 208.6)
-
Step 800
800
#33555C
oklch(42.6% 0.041 212.1)
-
Step 900
900
#2D464B
oklch(37.6% 0.032 211.5)
-
Step 950
950
#1B292C
oklch(27% 0.02 212.4)
#638F97 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) | #888C98 | 0.048 |
| Deuteranopia (no green cones) | #7F8597 | 0.043 |
| Tritanopia (no blue cones) | #509391 | 0.026 |
| Achromatopsia (no color) | #888888 | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638F97
#638F97
oklch(62.1% 0.049 210.1)
- #A27C75
#A27C75
oklch(62.1% 0.049 30.4)
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 #638F97, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Slate Gray #778899 ΔE 0.031
- Blue Grey #758DA3 ΔE 0.031
- Steel #738595 ΔE 0.032
- Steel Grey #6F828A ΔE 0.037
- Dusty Teal #4C9085 ΔE 0.040
- Silver Lake Blue #778DA9 ΔE 0.040
- Cadet Blue #5F9EA0 ΔE 0.041
- Slate Gray #708090 ΔE 0.043
Use #638F97 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.